LM1575

LM1575 ARTSCHIP | Alldatasheet

Document overview

• Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
• PDF pages: 25

Technical content

ARTSCHIP = a a oa LM1575/LM2575/LM2575HV Series = INO SIMPLE SWITCHER® 1A Step-Down Voltage Regulator nr «gs or General Description Features = The LM2575 series of regulators are monolithic integrated 3.3V, 5V, 12V, 15V, and adjustable output versions = circuits that provide all the active functions for a step-down =n Adjustable version output voltage range, NO (buck) switching regulator, capable of driving a 1A load with 1.23V to 37V (57V for HV version) +4% max over ré excellent line and load regulation. These devices are avail- line and load conditions a | able in fixed output voltages of 3.3V, 5V, 12V, 15V, and an n Guaranteed 1A output current oa adjustable output version. n Wide input voltage range, 40V up to 60V for HV version = Requiring a minimum number of external components, these » Requires only 4 external components regulators are simple to use and include internal frequency —,_ 52 kHz fixed frequency internal oscillator wo compensation and a fixed-frequency oscillator. n TTL shutdown capability, low power standby mode @ The LM2575 series offers a high-efficiency replacement for , High efficiency Oo ni os mer oi It encenionnn| a n Uses readily available standard inductors ~ ie nee i SURES ATE (PCRS ASS n Thermal shutdown and current limit protection Mm q : . i. . n P* Product Enhancement tested — A standard series of inductors optimized for use with the = LM2575 are available from several different manufacturers. . . "U This feature greatly simplifies the design of switch-mode Applications re power supplies. n Simple high-efficiency step-down (buck) regulator ITI Other features include a guaranteed +4% tolerance on out- © Efficient pre-regualtor for linear regulators cn put voltage within specified input voltages and output load On-card switching regulators = conditions, and +10% on the oscillator frequency. External n Positive to negative converter (Buck-Boost) shutdown is included, featuring 50 yA (typical) standby cur- — rent. The output switch includes cycle-by-cycle current limit- © ing, as well as thermal shutdown for full protection under — fault conditions. m ce RS | Typical Application (Fixed Output Voltage Versions) > FEEDBACK o” 7V - 40V(60V) +vy) LM2575/ FG oO UNREGULATED “| LM2575HV 7 “sv GS DG: INFUT -5.0 OUTPUT — REGULATED L OUTPUT oO +] ¢ . 330 uH Oo x - 3]6No 5] ON/oFF - BMI HL Coyy 1A Load | a 1N5819 lad = Note: Pin numbers are for the TO-220 package. - pe¥) Cc AU Co} c pF Oo 1 www.artschip.com

Block Diagram and Typical Application DC INPUT 7 REGULATOR T* : = FEED- Ro FIXED GAIN BACK ERROR AMP bie: COMPARATOR an a E ° BS. OUTPUT L1 Vout VV 000 : D1 " 1.23V L ouT L BAND-GAP 52 kHz reser | | THERMAL | | CURRENT + + 0 REFERENCE] | OSCILLATOR SHUTDOWN LIMIT 7 a = A GND a DS011475-2 3.3V, R2 = 1.7k 5V, R2 = 3.1k 12V, R2 = 8.84k 15V, R2 = 11.3k For ADJ. Version R1 = Open, R2 = 002 Note: Pin numbers are for the TO-220 package. FIGURE 1. Connection Diag raMS (XX indicates output voltage option. See Ordering Information table for complete part number.) sida eee TH Bent, Staggered Leads Pins 1,3 & 5 5-Lead TO-220 (T) — _————S 4- Feedback Gnd ;-—1—1r J 5- ON/OFF O ————— 3 -- Ground -—1—r I 4- Feedback —————S3 2- Output O —_— si cuaut DS011475-24 es tt £ — UUTPU oe cars22 1 1- Vin Side View Top Vi DS011475-23 LM2575T-XX Flow LBO3 or LM2575T XX or LM2575HVT XX Top Mew peecnplaslr A ciemecedierie - s See NS Package Number T05D See NS Package Number TO5A g 16—Lead DIP (N or J) 24-Lead Surface Mount (M) oo 16 1 24 Vin PWR GND — = . 2 15, ° . 3 14 wus TF OUTPUT GND . 4 21, -— > ono «5 at GND — 1? ono ._6 19, +6 11 7 18 GND FB OUTPUT FB 7 fo , sic cND— output 8 9 a 16. : SN/SEE ON/OFF — Py . it 4 =N DS011475-25 Vin 12 13 *No Internal Connection PWR GND . Top View DS011475-26 LIM2575N-XX or LM2575HVN-XX #855, Rlemal’Bbraediiia See NS Package Number J16A LM2575M-XX or LM2575HVM-XX g See NS Package Number M24B 2 www.artschip.com

Connection Diag raMS (XX indicates output voltage option. See Ordering Information table for complete part number.) (Continued) TO-263(S) 5-Lead Surface-Mount Package | ON/OFF TAB IS 4- Feedback GND 3- Ground Ls 2- Output 1- Vy DS011475-29 Top View Side View LM2575S-XX or LM2575HVS-XX See NS Package Number TS5B

Ordering Information

Package NSC Standard High Temperature Type Package Voltage Rating Voltage Rating Range Number (40V) (60V) 5-Lead TO-220 TO5A LM2575T-3.3 LM2575HVT-3.3 Straight Leads LM2575T-5.0 LM2575HVT-5.0 LM2575T-12 LM2575HVT-12 LM2575T-15 LM2575HVT-15 LM2575T-ADJ LM2575HVT-ADJ 5-Lead TO-220 TO5D LM2575T-3.3 Flow LBO3 LM2575HVT-3.3 Flow LBO3 Bent and LM2575T-5.0 Flow LBO3 LM2575HVT-5.0 Flow LBO3 Staggered Leads LM2575T-12 Flow LBO3 LM2575HVT-12 Flow LBO3 LM2575T-15 Flow LBO3 LM2575HVT-15 Flow LBO3 LM2575T-ADJ Flow LBO3 LM2575HVT-ADJ Flow LBO3 16-Pin Molded N16A LM 2575N-5.0 LM2575HVN-5.0 -40°C < T, < +125°C DIP LM2575N-12 LM2575HVN-12 LM2575N-15 LM2575HVN-15 LM 2575N-ADJ LM2575HVN-ADJ 24-Pin M24B LM 2575M-5.0 LM 2575HVM-5.0 Surface Mount LM2575M-12 LM2575HVM-12 LM2575M-15 LM2575HVM-15 LM2575M-ADJ LM2575HVM-ADJ 5-Lead TO-236 TS5B LM2575S-3.3 LM2575HVS-3.3 Surface Mount LM2575S-5.0 LM2575HVS-5.0 LM2575S-12 LM2575HVS-12 LM2575S-15 LM2575HVS-15 LM2575S-ADJ LM2575HVS-ADJ 16-Pin Ceramic J16A LM 1575J-3.3-QML DIP LM1575J-5.0-QML LM 1575J-12-OML -55°C < T, < +150°C LM1575J-15-OML LM1575J-ADJ-QML 5 | www.artschip.com

Absolute Maximum Ratings (note 1) Minimum ESD Rating If Military‘Aerospace specified devices are required, (C = 100 pF, R = 1.5 k&2) 2 kV please contact the National Semiconductor Sales Office/ Lead Temperature Distributors for availability and specifications. (Soldering, 10 sec.) 260°C Maximum Supply Voltage . - eS 4sv Operating Ratings __LM257SHV 63V Temperature Range ON /OFF Pin Input Voltage -O.3VEVE4Viy LM1575 -55°C < T, < +150°C Output Voltage to Ground LM2575/LM2575HV -40°C < T, < +125°C (Steady State) -1V Supply Voltage Power Dissipation Internally Limited LM1575/LM2575 40V Storage Temperature Range -65°C to +150°C LM2575HV 60V Maximum Junction Temperature 150°C LM1575-3.3, LM2575-3.3, LM2575HV-3.3

Electrical Characteristics

Specifications with standard type face are for T, = 25°C, and those with boldface type apply over full Operating Tempera- ture Range . Symbol Parameter Typ LM1575-3.3 LM2575-3.3 Units Limit Limit SYSTEM PARAMETERS (Note 4) Test Circuit Figure 2 Vout Output Voltage Vin = 12V, lloap = 0.2A V Circuit of Figure 2 3.267 3.234 V(Min) 3.333 3.366 Vi(Max) Vout Output Voltage 4.75V <= Vin, = 40V, 0.2A< Ioan S 1A V LM1575/LM2575 Circuit of Figure 2 3.200/3.168 3.168/3.135 V(Min) Vout Output Voltage 4.75V <= Vin = GOV, 0.2A< Ioan S 1A V LM2575HV Circuit of Figure 2 3.200/3.168 3.168/3.135 V(Min) LM1575-5.0, LM2575-5.0, LM2575HV-5.0 Specifications with standard type face are for T, = 25°C, and those with boldface type apply over full Operating Tempera- ture Range. Symbol Parameter Typ LINMI1575-5.0 LM2575-5.0 Units Limit Limit SYSTEM PARAMETERS (Note 4) Test Circuit Figure 2 Vout Output Voltage Vin = 12, lioap = 0.2A V Circuit of Figure 2 4.950 4.900 (Min) 5.050 5.100 Vi(Max) Vout Output Voltage 0.2A < lLoap = 1A, V LM 1575/LM2575 B8V<V,, = 40V 4.850/4.800 4.800/4.750 V(Min) Circuit of Figure 2 5.150/5.200 5.200/5.250 V(Max) Vout Output Voltage 0.2A < | oan = 1A, V LM 2575HV BV <V), = 60V 4.850/4.800 4.800/4.750 V(Min) Circuit of Figure 2 5.175/5.225 5.225/5.275 Vi(Max) 4 www.artschip.com

LM1575-12, LM2575-12, LM2575HV-12 Specifications with standard type face are for T, = 25°C, and those with boldface type apply over full Operating Tempera- ture Range . Symbol Parameter Typ LNM1575-12 LM2575-12 Units Limit Limit SYSTEM PARAMETERS (Note 4) Test Circuit Figure 2 Vout Output Voltage Vin = 25, lioap = 0.2A 12 V Circuit of Figure 2 11.88 11.76 V(Min) 12.12 12.24 Vi(Max) Vout Output Voltage 0.2A < loan = 1A, 12 V LM1575/LM2575 15V< Vi = 40V 11.64/11.52 11.52/11.40 V(Min) Circuit of Figure 2 12.36/12.48 12.48/12.60 V(Max) Vout Output Voltage 0.2A < loan = 1A, 12 V LM2575HV 15V<V,) <= 60V 11.64/11,.52 11.52/11.40 ViMin) Circuit of Figure 2 12.42/12.54 12.54/12.66 Vi(Max) LM1575-15, LM2575-15, LM2575HV-15 Specifications with standard type face are for T, = 25°C, and those with boldface type apply over full Operating Tempera- ture Range . Symbol Parameter Typ LNM1575-15 LNMI2575-15 Units Limit Limit SYSTEM PARAMETERS (Note 4) Test Circuit Figure 2 Vout Output Voltage Vin = 30V, lLoap = 0.2A V Circuit of Figure 2 14.85 14.70 V(Min) 15.15 15.30 V(Max) Vout Output Voltage 0.2A <= lLoap = 1A, V LM 1575/LM2575 18V < Vy <= 40V 14.55/14.40 14.40/14.25 V(Min) Circuit of Figure 2 15.45/15.60 15.60/15.75 Vi(Max) Vout Output Voltage 0.2A <= lLoap = 1A, V LM2575HV 18V < Vi, <= 60V 14.55/14.40 14.40/14.25 ViMin) Circuit of Figure 2 15.525/15.675 15.68/15.83 V(Max) LM1575-ADJ, LM2575-ADJ, LM2575HV-ADJ ewe with standard type face are for T,= 25°C, and those with boldface type apply over full Operating Temperature Symbol Parameter Typ LM1575-ADJ LNMI2575-ADJ Units Limit Limit SYSTEM PARAMETERS (Note 4) Test Circuit Figure 2 Vout Feedback Voltage Vin = 12V, loan = 0.2A 1.230 V Vou 25 1.217 1.217 V(Min) Circuit of Figure 2 1.243 1.243 V(Max) 5 www.artschip.com

LM1575-ADJ, LM2575-ADJ, LM2575HV-ADJ Electrical Characteristics (Continued) pp ecincations with standard type face are for T,= 25°C, and those with boldface type apply over full Operating Temperature ange. Symbol Parameter Typ LM1575-ADJ LNM2575-ADJ Units Limit Limit SYSTEM PARAMETERS (Note 4) Test Circuit Figure 2 Vout Feedback Voltage 0.2A <= loan = 1A, 1.230 V LM1575/LM2575 BV <V), = 40V 1.205/1.193 1.193/1.180 ViMin) Vout = 5V, Circuit of Figure 2 1.255/1.267 1.267/1.280 Vi(Max) Vout Feedback Voltage 0.2A < lLoap = 1A, 1.230 V LM2575HV 8V < V,,, = 60V 1.205/1.193 1.193/1.180 V(Min) Vout = SV, Circuit of Figure 2 1.261/1.273 1.273/1.286 V(Max) All Output Voltage Versions Specifications with standard type face are for T, = 25°C, and those with boldface type apply over full Operating Temperature Range. Unless otherwise specified, V\\,, = 12V for the 3.3V, 5, and Adjustable version, V,,, = 25 for the 12V version, and Vy = 30V for the 15V version. |, oa5 = 200 mA. Symbol Parameter Typ | LNM1575-xx LINMI2575-XX Units Limit Limit DEVICE PARAMETERS Current fo Oscillator Frequency (Note 13) 52 kH2 A7IA3 47/42 kHz(Min) 58/62 58/63 kH2(Max) Voat Saturation Voltage lout = 1A (Note 5) V DC Max Duty Cycle (ON) (Note 6) % lo Current Limit Peak Current (Notes 5, 13) 2.2 A I Output Leakage (Notes 7, 8) Output = OV 2 2 mA(Max) Current Output = -1V 7.5 mA Output = -1V 30 30 mA(Max) lo Quiescent Current (Note 7) mA lotay Standby Quiescent ON /OFF Pin = 5V (OFF) HA B54 Thermal Resistance T Package, Junction to Ambient (Note 9) 65 Oi T Package, Junction to Ambient (Note 10) 45 “CAV Bic T Package, Junction to Case 2 By, S Package, Junction to Ambient (Note 12) 37 6 www.artschip.com

All Output Voltage Versions Electrical Characteristics (continued) Specifications with standard type face are for T, = 25°C, and those with boldface type apply over full Operating Temperature Range. Unless otherwise specified, V\\,, = 12 for the 3.3V, 5V, and Adjustable version, V,,, = 25V for the 12V version, and V,, = 30V for the 15V version. |, 545 = 200 mA. Symbol Parameter Typ | LM1575-xxX LM2575-XX Units LM2575HV-xx | (Limits) Limit Limit (Note 2) (Note 3) ON /OFF CONTROL Test Circuit Figure 2 em Input Level Vour = Nominal Output Voltage 1.0/0.8 1.0/0.8 Vi(Max) lig ON /OFF Pin Input ON /OFF Pin = 5V (OFF) 12 WA Current HA(Max) Ie ON /OFF Pin = OV (ON) yA HA(Max) Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is in- tended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. Note 2: All limits guaranteed at room temperature (standard type face) and at temperature extremes (bold type face). All limts are used to calculate Average Out going Quality Level, and all are 100% production tested. Note3: All limits guaranteed at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits are 100% pro- duction tested. All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQ@C) methods. Note 4: External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance. When the LM1575/ LM 2575 is used as shown in the Figure 2 test circuit, system performance will be as shown in system parameters section of Electrical Characteristics. Note5: Output (pin 2) sourcing current. No diode, inductor or capacitor connected to output pin. Note6: Feedback (pin 4) removed from output and connected to OV. Note7: Feedback (pin 4) removed from output and connected to +12¥V for the Adjustable, 3.3, and 5V versions, and +25V for the 12V and 15¥ versions, to force the output transistor OFF. Note8: \\V/,, = 40 (60V for the high voltage version). Note9: Junction to ambient thermal resistance (no external heat sink) for the 5 lead TO-220 package mounted vertically, with 14 inch leads in a socket, or on a PC board with minimum copper area. Note 10: Junction to ambient thermal resistance (no external heat sink) for the 5 lead TO-220 package mounted vertically, with 42 inch leads soldered to a PC board containing approximately 4 square inches of copper area surrounding the leads. Note 11: Junction to ambient thermal resistance with approxmiately 1 square inch of pc board copper surrounding the leads. Additional copper area will lower thermal resistance further. See thermal model in Switchers made Simple software . Note 12: |f the TO-263 package is used, the thermal resistance can be reduced by increasing the PC board copper area thermally connected to the package: Using 0.5 square inches of copper area, 8), is 50°C/M¥. with 1 square inch of copper area, 8) is 3?7°CAM and with 1.6 or more square inches of copper area, 844 is 32°C/WV. Note 13: The oscillator frequency reduces to approximately 18 kHz in the event of an output short or an overload which causes the regulated output voltage to drop approximately 40% from the nominal output voltage. This self protection feature lowers the average power dissipation of the IC by lowering the minimum duty cycle from 5% down to approximately 2%. Note 14: Refer to RETS LM1575J for current revision of military RETS/SMD. Typical Performance Characteristics (Circuit of Figure 2 Normalized Output Voltage Line Regulation Dropout Voltage +1.0 14 2.0 — vat w=2v [fT | - {t= 29} = LITT TT ITT BS jog [boars 200m | SB yop | ees, | 2 | [Now = 14 | Son = 8 sat | nezsec, | | | 8 os |_| | | jer e CECA z 9 eS a Ae: 3.3V, 5V & ADJ 6 1.0} 7 _ 3-02}, a 5 02 a Sova ney > || REEL I es a a ee = | YP 5 | [tom 200m | | TS = -06 (77 | | [ [| Tf = 99 | f_ ff, | [ ft po TTT TTL 2 op | | | | tT tf a, 7/7] | | | Ss sot | 1 1 TT | oe oLLt tt tt tt | -50 -25 -0 25 50 75 100 125 0 10 20 30 40 SO 60 -75 -50-25 0 25 50 75 100 125 150 JUNCTION TEMPERATURE (°C) INPUT VOLTAGE (V) JUNCTION TEMPERATURE (°C) DS011475-32 DS011475-33 DSOtlais-s4 7 www.artschip.com

Typical Performance Characteristics (circuit of Figure 2 (Continued) Current Limit Quiescent Current Standby 3 20 Quiescent Current PT TTL Wi _ 8 Measured at ~ 200 TT 1 Wwe] = Jaren | eg er 3 vaso = 2 CT] TN < ‘ a J = 50 aT! tT e {ttt TN -“TVLLI TL I e CITT TTT = ~ S 2 \\ 3 = : 2 Nese] eg Rae] = = 19 d 2 100 oO > [TTT Po IS nee SS Sd — Ss iS [= 3 50 |} pee PETE TTT Ty [CTT e ‘leer ry TT 0 4 = -50 -25 0 25 50 75 100 125 150 o 1 20 30 40 50 60 a swt] | I tt JUNCTION TEMPERATURE (C°) INPUT VOLTAGE (V) “50-25 0 8925 50 75 100 125 DS01147535 DS011475-36 JUNCTION TEMPERATURE (°¢) DS011 475-37 Oscillator Frequency Switch Saturation Efficiency

8 Voltage 100

eae Fate I ] = 6 2 95 Se LTE ETT TT yo PT TT TTT TY | Yl a ea > 4 x 90 a, 2 ttt TI I Sa BEREREEEE= e (yout Th | po = = 4 = g twNi tlt 2 | ere | 5 ol yee e . [LIN II | 3 al [esc] tery | | | : ST TS 2 LTT | Nw 2 tert . | | | LPL z 4 5 clot | | | | NN m 150°C LL LT LL dn 120 | * LEFT TTT TT EEREREEw ~8 60 -75-50-25 0 25 50 75 100125150 Gi PTT ETE ELLE 0 10 20 30 40 50 60 JUNCTION TEMPERATURE (°C) 0 02 04 06 08 1.0 INPUT VOLTAGE (V) DS011475-38 SWITCH CURRENT (A) DSO11 475-40 DS01147539 Minimum Operating Voltage Quiescent Current Feedback Voltage 5.0 vs Duty Cycle vs Duty Cycle 4.5 20.0 T 20 a [Jamin] |g ®t wo x: 17.5 - 15 2 ee Z iol | wh SRR [ethos atin | g 3° in is = | |!|wl_ - CNET TT = gt ii i i Mt OM OM Z 125 Z = 5 SS S ofl i Ci = ot | KX 3 of | Sore] pute |g Se ; eS z 15 oan = 200 mA =z 75 o 45 > B n LOAD ~ MM ICL ALL z-f 7 [ [ [| ed ao : “LLL TLT 1 ed a a c we -50-25 0 25 50 75 100 125 0 -~20 JUNCTION TEMPERATURE (°C) 0 20 40 60 80 100 0 20 40 60 80 100 DER! DUTY CYCLE (%) DUTY CYCLE (%) DS01147542 DS011 475-43 8 www.artschip.com

Typical Performance Characteristics (Circuit of Figure 2) (Continued) Feedback Pin Current Maximum Power Dissipation

100 Po (TO-263) (See (Note 12))

zg 7 Pt} Tit} tt al . assem TT Sot = “SOT ERD - sAN TTT i= L = = \\ _ 3 = Fae Teac a eae eeee é a a SE = 72 SS 2 JON ISSA HH Fg I IL | LIL s Boe ost no F reas. SCC Sees Sczaas ~75-50-25 0 25 50 75 100125150 0 : 0 10 20 30 40 50 60 70 80 90100 JUNCTION TEMPERATURE (°C) psni1k7Ss-s AMBIENT TEMPERATURE (°C) 0S01147S-28 Switching Waveforms Load Transient Response Ha = wee i 100mv ue Sets m“ 0 : Voltage 0 Haan goon igmeds TAI oes mee ue Change 7 *\\ jenennenni 1A | Pog ; ; ; : psnii7ss 100psec/div. Vout = 5y DS0114757 &: Output Pin Voltage, 10\\Vidiv B: Output Pin Current, 1A/div C: Inductor Current, 0.5A/div D: Output Ripple Voltage, 20 m Vidiv, AC-Coupled Horizontal Time Base: 5 psidiv Test Circuit and Layout Guidelines As in any switching regulator, layout is very important. Rap- Single-point grounding (as indicated) or ground plane con- idly switching currents associated with wiring inductance struction should be used for best results. VWhen using the Ad- generate voltage transients which can cause problems. For justable version, physically locate the programming resistors minimal inductance and ground loops, the length of the leads near the regulator, to keep the sensitive feedback wiring indicated by heavy lines should be kept as short as possible. short. 9 www.artschip.com

Test Circuit and Layout Guidelines (continued Fixed Output Voltage Versions FEEDBACK +V, IN} LM2575HV | 4

11 FIXED OUTPUT | output L1 Vout

— 330 pH unrecuiaTen *4'°° “Fond 3 ON/oFF 4 BS Dt Cour ‘ DC INPUT Ci be 330 pF 4 D ~ DS011 475-8 Cin — 100 uF, 76V, Aluminum Electrolytic Court — 330 pF, 25V, Aluminum Electrolytic D1 — Schottky, 11D006 L1 — 330 yH, PE-52627 (for 5V in, 3.3¥ out, use 100 pH, PE-92108) Adjustable Output Voltage Version FEEDBACK “w] LM2575HV- | 4 Vour f ADJ OUTPUT Lt 5.00V VOY 7V - 60V — 330 uH UNREGULATED +9 100 HF GND 3 ON/OFF a + Cour F ‘ DC INPUT Gy DI 330 uF 11DQ06 , D ~ DS011475-9 Vout = V (1 + =) Ou REF Ri R2= RI (toe = 1) VREF where Vper = 1.23V, R1 between 1k and 5k. R1 — 2k, 0.1% R2 — 6.12k, 0.1% Note: Pin numbers are for the TO-220 package. FIGURE 2. 10 www.artschip.com

LM2575 Series Buck Regulator Design Procedure PROCEDURE (Fixed Output Voltage Versions) EXAMPLE (Fixed Output Voltage Versions) Given: Given: Vout = Regulated Output Voltage (3.3V, 5V, 12V, or 15) Vout = 5V Viy(Max) = Maximum Input Voltage Vin(Max) = 20V lLoap(Max) = Maximum Load Current lLoap(Max) = 0.8A 1. Inductor Selection (L1) 1. Inductor Selection (L1) A. Select the correct Inductor value selection guide from Fig- A. Use the selection guide shown in Figure 4. ures 3, 4, 5, 6 (Output voltages of 3.3V, SV, 12V or 15V re- B. From the selection guide, the inductance area intersected spectively). For other output voltages, see the design proce- by the 20V line and 0.8A line is L330. Giresfonthe adjustable Licniagenes ; Co ; C. Inductor value required is 330 WH. From the table in Fig- B. From the inductor value selection guide, identify the in- ure 9, choose AIE 415-0926, Pulse Engineering PE-52627, ductance region intersected by V\\,.(Max) and |, oa5(Man, or RL1952. and note the inductor code for that region. C. Identify the inductor value from the inductor code, and se- lect an appropriate inductor from the table shown in Figure 9. Part numbers are listed for three inductor manufacturers. The inductor chosen must be rated for operation at the LM2575 switching frequency (52 kHz) and for a current rat- ing of 1.15 x | gap. For additional inductor information, see the inductor section in the Application Hints section of this data sheet. 2. Output Capacitor Selection (Co.7) 2. Output Capacitor Selection (Coy7) A. The value of the output capacitor together with the induc- A. Co)7 = 100 uF to 470 uF standard aluminum electrolytic. tor defines the dominate pole-pair of the switching regulator B. Capacitor voltage rating = 20V. loop. For stable operation and an acceptable output ripple voltage, (approximately 1% of the output voltage) a value be- tween 100 uF and 470 LF is recommended. B. The capacitor’s voltage rating should be at least 1.5 times greater than the output voltage. For a 5V regulator, a rating of at least 8V is appropriate, and a 10V or 15V rating is rec- ommended. Higher voltage electrolytic capacitors generally have lower ESR numbers, and for this reasion it may be necessary to select a capacitor rated for a higher voltage than would nor- mally be needed. 3. Catch Diode Selection (D1) 3. Catch Diode Selection (D1) A. The catch-diode current rating must be at least 1.2 times A. For this example, a 1A current rating is adequate. greater than the maximum load current. Also, if the power B. Use a 30V 1N5818 or SR103 Schottky diode, or any of supply design must withstand a continuous output short, the the suggested fast-recovery diodes shown in Figure 8. diode should have a current rating equal to the maximum current limit of the LM2575. The most stressful condition for this diode is an overload or shorted output condition. B. The reverse voltage rating of the diode should be at least 1.25 times the maximum input voltage. 4. Input Capacitor (C,,)) 4. Input Capacitor (C,,) An aluminum or tantalum electrolytic bypass capacitor lo- A 47 uF, 25V aluminum electrolytic capacitor located near cated close to the regulator is needed for stable operation. the input and ground pins provides sufficient bypassing. 11 www.artschip.com

FIGURE 3. LM2575(HV)-3.3 FIGURE 5. LM2575(HV)-12 FIGURE 4. LM2575(HV)-5.0 FIGURE 6. LM2575(HV)-15

5 MW Ae ae

FIGURE 7. LM2575(HV)-ADJ

(Continued) PROCEDURE (Adjustable Output Voltage Versions) EXAMPLE (Adjustable Output Voltage Versions) Given: Given: Vout = Regulated Output Voltage Vout = 10V Vijy(Max) = Maximum Input Voltage Vin(Max) = 25V lLoap(Max) = Maximum Load Current lLoap(Max) = 1A F = Switching Frequency (Fixed at 52 kHz) F = 52 kHz 1. Programming Output Voltage (Selecting R1 and R2, as 1.Programming Output Voltage (Sefecting R1 and R2) shown in Figure 2 ) Re Use the following formula to select the appropriate resistor Vout = 1.23( 1 + =) Select R1 = 1k values. R1 VouT 10V R2 pa = ri (VOUT 4 = 1k{ —— -—1 Vout = VREF (1 + *) where Veer = 1.23V 2 VREF 1.23V R, can be between 1k and 5k. (For best temperature coeffi- R2 = 1k (8.13 - 1) = 7.13k, closest 1% value is 7.15k cient and stability with time, use 1% metal film resistors) Vi R2= Rt (S< Hs 1) VREF 2. Inductor Selection (L1) 2. Inductor Selection (L1) A. Calculate the inductor Volt * microsecond constant, A. Calculate E * T (V * us) E* T (V* us), from the following formula: 10 1000 E eT = (Vin — Vout) Out oO ve ys) ~~ © , Vin F (in kHz) B.E*T=115V «us B. Use the E * T value from the previous formula and match C. I can(Max) = 1A it with the E * T number on the vertical axis of the Inductor oo Value Selection Guide shown in Figure 7. D. Inductance Region = H470 . : : E. Inductor Value = 470 wH Choose from AIE part Cc. On the h tal lect th load t. TANG DON ZONAL BS, STOCIINE magna loa caren #430-0634, Pulse Engineering part #PE-53118, or Renco D. Identify the inductance region intersected by the E « T part #RL-1961 value and the maximum load current value, and note the in- ‘ ductor code for that region. E. Identify the inductor value from the inductor code, and se- lect an appropriate inductor from the table shown in Figure 9. Part numbers are listed for three inductor manufacturers. The inductor chosen must be rated for operation at the LM2575 switching frequency (52 kHz) and for a current rat- ing of 1.15 x |. oap. For additional inductor information, see the inductor section in the application hints section of this data sheet. 13 www.artschip.com

(Continued) PROCEDURE (Adjustable Output Voltage Versions) EXAMPLE (Adjustable Output Voltage Versions) 3. Output Capacitor Selection (Coy7) 3. Output Capacitor Selection (Coy7) A. The value of the output capacitor together with the induc- A. tor defines the dominate pole-pair of the switching regulator 25 loop. For stable operation, the capacitor must satisfy the fol- Cout > 7,785 70° 150 = 130 pF lowing requirement: C - +786 Vin(Max) Wr) However, for acceptable output ripple voltage select OUT = /; Vout e L(wH) bed Court > 220 HF Court = 220 uF electrolytic capacitor The above formula yields capacitor values between 10 UF and 2000 pF that will satisfy the loop requirements for stable operation. But to achieve an acceptable output ripple volt- age, (approximately 1% of the output voltage) and transient response, the output capacitor may need to be several times larger than the above formula yields. B. The capacitor’s voltage rating should be at last 1.5 times greater than the output voltage. For a 10V regulator, a rating of at least 15V or more is recommended. Higher voltage electrolytic capacitors generally have lower ESR numbers, and for this reasion it may be necessary to select a capacitor rate for a higher voltage than would nor- mally be needed. 4. Catch Diode Selection (D1) 4. Catch Diode Selection (D1) A. The catch-diode current rating must be at least 1.2 times A. For this example, a 3A current rating is adequate. greater than the maximum load current. Also, if the power B. Use a 40V MBR340 or 31DQ04 Schottky diode, or any of supply design must withstand a continuous output short, the the suggested fast-recovery diodes in Figure 8. diode should have a current rating equal to the maximum current limit of the LM2575. The most stressful condition for this diode is an overload or shorted output. See diode selec- tion guide in Figure 8. B. The reverse voltage rating ofthe diode should be at least 1.25 times the maximum input voltage. 5. Input Capacitor (C,,) 5. Input Capacitor (C,,)) An aluminum or tantalum electrolytic bypass capacitor lo- A 100 pF aluminum electrolytic capacitor located near the in- cated close to the regulator is needed for stable operation. put and ground pins provides sufficient bypassing. To further simplify the buck regulator design procedure, National Semiconductor is making avaifable computer design software fo be used with the Simple Switcher line of switching regulators. Switchers Made Simple (version 3.3) is available on a (3Y2") dis- kette for {BM compatible computers from a National Semiconductor safes office in your area. 14 www.artschip.com

INPUT CAPACITOR (C,,) in sensitive circuits, or can give incorrect scope readings be- To maintain stability, the regulator input pin must be by- cause of induced voltages in the scope probe. passed with at least a 47 UF electrolytic capacitor. The ca- The inductors listed in the selection chart include ferrite pot pacitor’s leads must be kept short, and located near the core construction for AIE, powdered iron toroid for Pulse En- regulator. gineering, and ferrite bobbin core for Renco. If the operating temperature range includes temperatures An inductor should not be operated beyond its maximum below -—25°C, the input capacitor value may need to be rated current because it may saturate. When an inductor be- larger. VVith most electrolytic capacitors, the capacitance gins to saturate, the inductance decreases rapidly and the value decreases and the ESR increases with lower tempera- inductor begins to look mainly resistive (the DC resistance of tures and age. Paralleling a ceramic or solid tantalum ca- the winding). This will cause the switch current to rise very pacitor will increase the regulator stability at cold tempera- rapidly. Different inductor types have different saturation tures. For maximum capacitor operating lifetime, the characteristics, and this should be kept in mind when select- capacitor’s RMS ripple current rating should be greater than ing an inductor. The inductor manufacturer's data sheets include current and 12x (‘) raters energy limits to avoid inductor saturation. INDUCTOR RIPPLE CURRENT where ‘On = Vout for a buck regulator When the switcher is operating in the continuous mode, the T VIN inductor current waveform ranges from a triangular to a saw- tooth type of waveform (depending on the input voltage). For ton _ __lVour! buck-boost regulator ven i and or Wourl + Vw? uck-boost regulator. a given input voltage and output voltage, the peak-to-peak OUT IN amplitude of this inductor current waveform remains con- stant. As the load current rises or falls, the entire sawtooth INDUCTOR SELECTION current waveform also rises or falls. The average DC value All switching regulators have two basic modes of operation: of this waveform is equal to the DC load current (in the buck continuous and discontinuous. The difference between the regulator configuration). two types relates to the inductor current, whether it is flowing Ifthe load current drops to a low enough level, the bottom of continuously, or if it drops to zero for a period of time in the the sawtooth current waveform will reach zero, and the normal switching cycle. Each mode has distinctively different switcher will change to a discontinuous mode of operation. operating characteristics, which can affect the regulator per- This is a perfectly acceptable mode of operation. Any buck formance and requirements. switching regulator (no matter how large the inductor value The LM2575 (or any of the Simple Switcher family) can be is) will be forced to run discontinuous if the load current is used for both continuous and discontinuous modes of opera- light enough. tion. The inductor value selection guides in Figure 3 through Fig OUTPUT CAPACITOR ure 7 were designed for buck regulator designs of the con- An output capacitor is required to filter the output voltage and tinuous inductor current type. When using inductor values is needed for loop stability. The capacitor should be located shown in the inductor selection guide, the peak-to-peak in- near the LM2575 using short pc board traces. Standard alu- ductor ripple current will be approximately 20% to 30% of the minum electrolytics are usually adequate, but low ESR types maximum DC current. With relatively heavy load currents, are recommended for low output ripple voltage and good the circuit operates in the continuous mode (inductor current stability. The ESR of a capacitor depends on many factors, always flowing), but under light load conditions, the circuit some which are: the value, the voltage rating, physical size will be forced to the discontinuous mode (inductor current and the type of construction. In general, low value or low falls to zero for a period of time). This discontinuous mode of voltage (less than 12\\V) electrolytic capacitors usually have operation is perfectly acceptable. For light loads (less than higher ESR numbers. approximately 200 mA) it may be desirable to operate the The amount of output ripple voltage is primarily a function of regulator in the discontinuous mode, primarily because of the ESR (Equivalent Series Resistance) of the output ca- the lower inductor values required for the discontinuous pacitor and the amplitude of the inductor ripple current mode. (Al, yp). See the section on inductor ripple current in Applica- The selection guide chooses inductor values suitable for tion Hints. continuous mode operation, but if the inductor value chosen The lower capacitor values (220 UF—680 UF) will allow typi- is prohibitively high, the designer should investigate the pos- cally 50 mV to 150 mV of output ripple voltage, while sibility of discontinuous operation. The computer design soft- larger-value capacitors will reduce the ripple to approxi- ware Swifchers Made Simple will provide all component mately 20 mV to 50 mV. values for discontinuous (as well as continuous) mode of op- Output Ripple Voltage = (Alj5) (ESR of Cou) eration: ; a To further reduce the output ripple voltage, several standard Inductors are available in different styles such as pot core, electrolytic capacitors may be paralleled, or a higher-grade toriod, E-frame, bobbin core, etc., as well as different core capacitor may be used. Such capacitors are often called materials, such as ferrites and powdered iron. The least ex- “high-frequency,” “low-inductance,” or “low-ESR.” These will pensive, the bobbin core type, consists of wire wrapped on a reduce the output ripple to 10 mV or 20 mV. However, when ferrite rod core. This type of construction makes for an inex- operating in the continuous mode, reducing the ESR below pensive inductor, but since the magnetic flux is not com- 0.052 can cause instability in the regulator. pletely contained within the core, it generates more electro- magnetic interference (EMI). This EMI can cause problems 16 www.artschip.com

Application Hints (Continued GROUNDING To maintain output voltage stability, the power ground con- Tantalum capacitors can have a very low ESR, and should nections must be low-impedance (see Figure 2). For the be carefully evaluated if it is the only output capacitor. Be- TO-3 style package, the case is ground. For the 5-lead cause of their good low temperature characteristics, a tanta- TO-220 style package, both the tab and pin 3 are ground and lum can be used in parallel with aluminum electrolytics, with either connection may be used, as they are both part of the the tantalum making up 10% or 20% of the total capacitance. same copper lead frame. The capacitor’s ripple current rating at 52 kHz should be at With the N or M packages, all the pins labeled ground, power least 50% higher than the peak-to-peak inductor ripple cur- ground, or signal ground should be soldered directly to wide rent. printed circuit board copper traces. This assures both low in- ductance connections and good thermal properties. CATCH DIODE Buck regulators require a diode to provide a return path for HEAT SINK/THERMAL CONSIDERATIONS the inductor current when the switch is off. This diode should In many cases, no heat sink is required to keep the LM2575 be located close to the LM2575 using short leads and short junction temperature within the allowed operating range. For printed circuit traces. each application, to determine whether or not a heat sink will Because of their fast switching speed and low forward volt- be required, the following must be identified: age drop, Schottky diodes provide the best efficiency, espe- 1. Maximum ambient temperature (in the application). cially in low output voltage switching regulators (less than Si Maximum reguistor:power dissipation (incapolication) 5V). Fast-Recovery, High-Efficiency, or Ultra-Fast Recovery . : diodes are also suitable, but some types with an abrupt 3. Maximum allowed junction temperature (150°C for the turn-off characteristic may cause instability and EMI prob- LM1575 or 125°C for the LM2575). For a safe, conserva- lems. A fast-recovery diode with soft recovery characteristics tive design, a temperature approximately 15°C cooler is a better choice. Standard 60 Hz diodes (e.g., 1N4001 or than the maximum temperature should be selected. tky and “soft” fast-recovery diode selection guide. Total power dissipated by the LM2575 can be estimated as follows: OUTPUT VOLTAGE REPoRRne Tenens . Po = (Vin) (le) + Voli) (oan) Wear) ‘The Gui pur voraas Sha eestenng eo mip ty wall Raritan - where |, (quiescent current) and Vo,; can be found in the sawtooth ripple voltage at the switcher frequency, typically a : ; : about 1% of the output voltage, and may also contain short idole natin ed Calves anon previcdshy; Viv ietne applied : minimum input voltage, V,, is the regulated output voltage, voltage spikes at the peaks of the sawtooth waveform. ‘ . 3 and l.oap is the load current. The dynamic losses during The output ripple voltage is due mainly to the inductor saw- turn-on and turn-off are negligible if a Schottky type catch di- tooth ripple current multiplied by the ESR of the output ca- ode is used. pacitor. (See the inductor selection in the application hints.) When no heat sink is used, the junction temperature rise can The voltage spikes are present because of the the fast be determined by the following: switching action of the output switch, and the parasitic induc- AT, = (Po) ya) tance of the output filter capacitor. To minimize these voltage J Oe aeuh spikes, special low inductance capacitors can be used, and To arrive at the actual operating junction temperature, add their lead lengths must be kept short. Wiring inductance, the junction temperature rise to the maximum ambient tem- stray capacitance, as well as the scope probe used to evalu- perature. ate these transients, all contribute to the amplitude of these T, = AT, +Ta spikes. If the actual operating junction temperature is greater than An additional small LC filter (20 WH & 100 WF) can be added the selected safe operating junction temperature determined to the output (as shown in Figure 15) to further reduce the in step 3, then a heat sink is required. amount of output ripple and transients. A 10 x reduction in When using a heat sink, the junction temperature rise can be output ripple voltage and transients is possible with this filter. determined by the following: FEEDBACK CONNECTION AT, e (Po) (8jc + Bintertace * BHeat sink) The LM2575 (fixed voltage versions) feedback pin must be The:opareing JUncton:tamiperatare: will: be: wired to the output voltage point of the switching power sup- Ty = Ta + AT, ply. When using the adjustable version, physically locate As above, if the actual operating junction temperature is both output voltage programming resistors near the LM2575 greater than the selected safe operating junction tempera- to avoid picking up unwanted noise. Avoid using resistors ture, then a larger heat sink is required (one that has a lower greater than 100 k{2 because of the increased chance of thermal resistance). noise pickup. When using the LM2575 in the plastic DIP (N) or surface —___ mount (M) packages, several items about the thermal prop- ON /OFF INPUT erties of the packages should be understood. The majority of For normal operation, the ON /OFF pin should be grounded the heat is conducted out of the package through the leads, or driven with a low-level TTL voltage (typically below 1.6). with a minor portion through the plastic parts of the package. To put the regulator into standby mode, drive this pin with a Since the lead frame is solid copper, heat from the die is high-level TTL or CMOS signal. The ON /OFF pin can be readily conducted through the leads to the printed circuit safely pulled up to +V\\,, without a resistor in series with it. board copper, which is acting as a heat sink. The ON /OFF pin should not be left open. For best thermal performance, the ground pins and all the unconnected pins should be soldered to generous amounts 17 www.artschip.com

7 Low ESR Z1 —

Typical Load Current Note: Complete circuit not shown. 200 mA for Vy = -5.2V Note: Pin numbers are for the TO-220 package. Note: Pin numbers are for TO-220 package. FIGURE 11. Negative Boost The ON /OFF pin can be used to provide a delayed startup Note: Complete circuit not shown (see Figure 70). feature as shown in Figure 74. With an input voltage of 20V Note: Pin numbers are for the TO-220 package. Note: Complete circuit not shown. Note: Pin numbers are for the TO-220 package. FIGURE 14. Delayed Startup

Definition of Terms (Continued) OPERATING VOLT MICROSECOND CONSTANT (EeT,,,) The product (in Volt*us) of the voltage applied to the inductor INDUCTOR SATURATION and the time the voltage is applied. This E*T,,, constant is a The condition which exists when an inductor cannot hold any measure of the energy handling capability of an inductor and more magnetic flux. When an inductor saturates, the induc- is dependent upon the type of core, the core area, the num- tor appears less inductive and the resistive component domi- ber of turns, and the duty cycle. nates. Inductor current is then limited only by the DC resis- tance of the wire and the available source current. 21 www.artschip.com

Physical Dimensions inches (millimeters) unless otherwise noted po 8s — 16 9 0.220-0.310 [5.59-7.87] J _—t p 0.025 ine] : 0.005-0.020 R [0:13-0.51] |? 0.037+0.005 typ aaas {0.944 0.13] 0.290-0.320 MIN TYP | [1.4020.13] © i GLASS SEALANT ; 0.020-0.060 [5.08] a (‘is7pe were UCI OO 0.010 0.002 - ft [o.2540.05] "YP

4 Pisa MIN TYP

0.125-0.200 O44 | 950450 | istecssoe) TY? 90° 4 f (35085 0.080 ok BOTH ENDS = — eae 0 Dal TYP “a [7.87-10.41] 4164 (REV L) 0.10040.010 typ , : [2.544 0.25] 16-Lead Ceramic Dual-in-Line (J) Order Number LM1575J-3.3/883, LM1575J-5.0/883, LM1575J-12/883, LM1575J-15/883, or LM1575J-ADJ/883 0.6141 0.5985 15.60 15.20 24 23 22 21 20 19 18 17 16 15 14 13 VNUUUUDUEUEEoUEoUo8 Poo ooo 0.4190 0.3940 10.65 LEAD NO 1 0.2992 '9)°° IDENTIFICATION 0.2944 TOTTOOT OO oO OD

11 TR Be

| i eae Se Pe Ae 12 00 (0.050 . Save PEP OLEOP 0.1043 Sa 0.0125 0.0926 450 y 0.010 0,003! TYP ALL LEADS 2-65 | 0.0040 0:28 of ee eS SEATING TERE FE] 3 PLANE TT ow a B° MAX TYP- 0.014 ALL LEAD TIPS 9.0508 el trae 0.35 “T.27 (‘TYP ALL LEADS 0.40 248 (REV F) 14-Lead Wide Surface Mount (WM) Order Number LM2575N-5.0, LM2575HVM-5.0, LMI2575M-12, LM2575HVIM-12, LM2575M-15, LM2575HVM-15, LM2575M-ADJ or LM2575HVM-ADJ 22 www.artschip.com

Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 0.843-0.870 0.090 0.843-0.870 (2.337) NOM DIA NOM A eo (2X) | PIN NO. 1 IDENT | G) G) alin oN (6.350 :0.127) 0.280 ls Gai=| Gis iy Lz] 13) Lay Ls} Le} 2d Le = (0.762) 0.145-0.200 (3.683—5.080) N164 (REV E) 16-Lead Molded DIP (N) Order Number LM2575N-5.0, LM2575HVN-5.0, LMI2575N-12, LMI2575HVN-12, LM2575N-15, LMi2575HVN-15, LM2575N-ADJ or LM2575HVN-ADJ 0.100-0.120 0.149-0.153 as 3 9°: .030-0.040 0.400 “900s | [10.16 *0°°8] | | >>, - — | gy 0:057-0.077 _ 0.240-0.260 LL 0.330-0.350 n SEATING PLANE _—_, +0. +0.18 TYP [0.38 4/3] | 0.175-0.185 [4.45-4.70] ‘|e 1.005-1.035 TAPER SIDES 1° [25.53-26.29] eT 5-Lead TO-220 (7) Order Number LM2575T-3.3, LM2575HVT-3.3, LM2575T-5.0, LM2575HVT-5.0, LM2575T-12, LM2575HVT-12, LM2575T-15, LM2575HVT-15, LM2575T-ADJ or LM2575HVT-ADJ 23 www.artschip.com

Physical Dimensions inches (millimeters) unless otherwise noted (Continued) [10° +39 TYP 0.057-0.077 —— [1.45-1.96] 0.260-0.280 aa 3 | ae _.| 0.330-0.350 Le PIN #1 ID it. 0.050 Rfo.76] Mae TP =f [1.70] [1.27] Oke] a 0.015-0.030 vP ie | 0.035 [10.41] i107) TP 0.175-0,183 [0.89] [4.45-4.65] 1 ef = ——t—— LEAD POSITION OVERLAY “FS ] 0.00410. 10] TAPERED P TS Ta STAND-OFF 0.490 yay—p [12.45] | 0,565 [14.35] MAS CONTROLLING DIMENSION: INCH 0.250 — [6.35] | 0.200 yin [5.08] TS5B (REV B) TO-263, Molded, 5-Lead Surface Mount Order Number LM2575S-3.3, LM2575HVS-3.3, LM2575S-5.0, LM2575HVS-5.0, LM2575S-12, LM2575HVS-12, LM2575S-15, LM2575HVS-15, LM2575S-ADJ or LM2575HVS-ADJ 24 www.artschip.com

Physical Dimensions inches (millimeters) unless otherwise noted (Continued) = a 9-151 #0.002 ae | 0.110 40.010 = 3.84 40.05 ao ry = = a ROSES CEES yyy Nm . 0.8940.13 ts | 0.40040-012 - on 10.16 26-78 rm ot e~=0.13 x = oe = {__ 0.067 +0.005 a SS 1.702£0.13 aa | 0.340 + 0.010 Ie s 8.64 £0.25 0,250 + 0.010 PIN ONE ID < 6.3540.25 I~ 0.13440.015 0.015 75-599 4 3.40 £0.38 40.25 ae ee g ‘ @ TAPERED SIDES 1° 4 0.343 0.324 ” ‘ 8.70 = 8.24 0.180 +0.005 4.5740.13 ¥ 0.105 a 2.67 SEATING PLANE mT 0.050 +0.002 ae 0.176 + 0.009 ~” 0.050 £0.002 3 0.176 40.009

17.88 TOSD (REV A) —

Bent, Staggered 5-Lead TO-220 (T) a Order Number LM2575T-3.3 Flow LB03, LM2575HVT-3.3 Flow LBO3, I LM2575T-5.0 Flow LB03, LM2575HVT-5.0 Flow LBO3, imi LM2575T-12 Flow LB03, LM2575HVT-12 Flow LB03, LM2575T-15 Flow LB03, LM2575HVT-15 Flow LBO3, A LM2575T-ADJ Flow LB03 or LM2575HVT-ADJ Flow LB03 —_ ar Oo Es o pat) AU Co] c w fe) 25 www.artschip.com