HS7067 NSC | Alldatasheet
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3 A National PRELIMINARY
= Semiconductor So i . . se 8 | HS7067/HS7 107 7 Amp, Multimode, High Efficiency Switching Regulator General Description Features The HS7067/HS7107 is a hybrid high efficiency switching @ HS7067—10V to 60V input regulator with high output current capability. The device ism HS7107—10V to 100V input housed in a standard TO-3 package containing a tempera- ™ 7A continuous output current ture compensated voltage reference, a pulse-width modula- ~—@ Step-down, inverting, and transformer-coupled operation tor with programmable oscillator frequency, error amplifier, gy Frequency adjustable to 200 kHz high current, high voltage output switch and steering diode. @ High-efficiency (>75%) The HS7067/HS7107 operates in a step-down, inverting, as Ss 9 d 8-pin TO-3 pack: well as in a transformer-coupled mode. im Standard 8-pin Package The HS7067/HS7107 can supply up to 7A of continuous output current over a wide range of input and output volt- ages. Block and Connection Diagrams INPUT = SSS 2 output © DIODE anne) LJ CLOCK O ‘CASE TIMING 0 + es eR © crouno cr )> o i> o
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~< <4 TE ema, © EXTERNAL CAP (War) PWM CONTROL «1 AND COMPENSATION TUK/6746-1 Metal Can Package pwm conrao. /C) ‘AND COMPENSATION 1 8 OUTPUT wer cP OA\\ one ane n\\3 5 O8/ crocx ot § /mpur TUK/6746-2 Top View Case is ground Order Number HS7067CK, HS7067K, HS7107CK or HS7107K ‘See NS Package Number KO8A ‘ 2-4
Absolute Maximum Ratings q If Military/Aerospace specified devices are required, Ta, Operating Temperature Range g please contact the National Semiconductor Sales HS7067C/7107C —25°Cto+esc | > Office/Distributors for availability and specifications. 448706777107 secto +1280 |B Vin: Input Voltage Tse, Storage TemperatureRange — 65°C to + 150°C = HS7067 65V Va(Vp—7). ~~ 487107 t05v Steering Diode Reverse Voltage 105V lout, Output Current 8A Ip(l7—-e). Ts, Operating Temperature 150°C Steering Diode Forward Current 8A Pp, Internal Power Dissipation 25w Electrical Characteristics 1. = 25°C, viy - 20v (unless otherwise specified) symbol | __—Parameter | Conattions | -win' | ‘Typ | Max | Unite Vin-Vout 10V < Vin < Vin(max) | [sof |v lour = 24 Note 6) | feof [ov Vs Switch Saturation Voltage lo=7.0AVin= tov [_Hs7107 |__| 16 | TaD | Vv [ usveor | | [19 |v [ic=20avw=tv | of of |v Ve Steering Diode On Voltage Ip = 7.0A [us7to7 | | 13 | tao] vv [ usveor | [47 [ re | [iomama Tf |v Vin Supply Voltage Range | H87067 | Tu =TasTwx | 10 | | eo |v nore) L ns7to7 | tww=Tastwx | 10 | | too |v in | Stooring Diode Reverse Current [ Va=tov | iL «| |p - | le Quiescent Curent (Note 3) | owouyoycieve=so [| 6 | | ma | to0% Duyoycieva= ov) | | 26 | | ma Vouxn | GlockOuputtign tue = 75nd | te || Ver | Gockouputtow tux = eee | S| Sf |v (oe Reference Voltage on Pin 2 | Ra | ResistancoonPinatoGround | Noto | Sd a | | Vout Feedback Resistor Ry Tol. 1% Luszio7 | | 4 [reo] ,, Va [ votageswing~ring TT Sd go | CV la | crergingGunent—ring TT a] tax | Clockinputcurent—einé | Vox=aev |S as | | ma t Transistor Current Rise Time [io=20ainotes) S| =| vo |_| ns [o=70awoos || 0 | ns t Transistor Current Fall Time [to=20awotes | | 100 | ~—Ssd| sans [io=70amows || 10 | |r ts [ Diode StorageTine | t= 70nmNotos) | | 20 | | ta [ Deytime | ty 70nWNotos) | | 00 || tyax | MaxClock Frequency votes) | SiC; sfa00 |e
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5 Electrical Characteristics 1, = 25°C, viy = 20V (unless otherwise specified) (Continued)
8 |_ Ze (Note6) | fs | | mn BS] oo Efficiency Vour=5V | fo=25kHz(Notes) | | 80 | | % = lour= A [io=zoonrzwoes) | | 7 | | % 6c | ThomaiRessance | ote) TT so | cow Note 1: 8, is typically 35°C/W for natura! convection cooling. Note 2: Vour and lout refer to the output DC voltage and output current of a switching supply after the output LC filter as shown in Figure 1. Note 3: Quiescent current depends on the duty cycle of the switching translator. Note 4: This test includes the input bias current of the error amplifier. Note 5: Circuit configured as shown in Figure 7. Note 6: These parameters are not tested. They are given for informational purposes only. Note 7: Functionally tested at limits only (pass-fail). Typical Performance Characteristics Frequency vs Timing Typical Compensation Power Derating Curve Capacitance ‘00 Input Voltage vs Rc 3 1 =e — 4 [TN | | Fre —— Sees a Ee ESSE | { 1) [| seo NSTI Schnodo e*tT TN COC 6 ESS E"TTOINGE, | «gm L es Na \\ Saarinen wee N th ee | N 5 hey Ni a h FoR N! Join, MS O 25 50 75 100 125 150 175 100 1000 10000 mh rag [AMBIENT TEMPERATURE (°C) (Cr-—TIMING CAPACITANCE (9F) Rela TuK/6746-3 Osc = 4°C/W t-—! R -[ 200k Ja @yq = 35°C/W 0 TOK x Cr o LVin@ax x og = Typical Applications ee THE BUCK CONVERTER (Step Down) The buck converter is the most common application in 0.0089 pF switching-power conversion. It allows to step down a volt- age with a minimum of components and a maximum of effi- ciency (for further information on the theory of operation of [om | 4ko | ako __—| a buck converter, see AN-343). 5:7kn Vin = 10V to 35V Load Regulation = 40 mV Vout = 5V Line Regulation = 5 mV lout = 1A to 6A L u + 120/240 ic S}uszoe7/Hs7107 Si 1k Con CASE 7 i 2 4 f Cc a 1 fo NS ! TuK/6746-4
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capacitor. >< lomin and < 7—loMAK: ed converters. i converter can be calculated with the following equations. Figure 1 shows a functional diagram of a flyback converter. FIGURE 1. Typical Flyback Functional Diagram
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FIGURE 2. Typical Flyback Waveforms PWM (Pulse Width Modulator) which in turn, modulates the forward converter. FIGURE 3. Typical Forward Functional Diagram
t s | Typical Applications (continued) 2 | with both flyback and forward topologies, it is possible to Isolated Flyback Converter r fou) \\ Ing converter by using an opamp Figure 7 shows an isolated flyback converter using a sense gs ° winding for feedback. Although, in practice the line regula- BS y, tion is acceptable, the load regulation can be marginal if the =x bad a“. coupling between the windings is poor. However, the sense seers winding cannot detect any ohmic voltage drop in the main Vo output so, a heavier gauge wire should be used to reduce Ea this regulation error. Also, the sense winding will not sense the non-linear voltage drop across the diode, and this ac- counts for most of the load regulation inaccuracy. There- fore, the sense winding method is only recommended for == a applications where load variations are small. Figure 7 shows an isolated flyback converter with an output of 5V at 2A. The input voltage range is from +10V to +40V. The output can be adjusted to +5V by using the 5 kf trimpot. TLK/6748-10 Performance Data FIGURE 5 [— Parameter | Conattions | Resuit_| Flyback Step-Up Application = — Figure 6 shows flyback converter in a step-up mode where Efficiency an input voltage of +12V to +30V will be converted into a Vin = 30V regulated output voltage of +50V. Line Regulation Vout = 5V @ 2A 40V < Vin < 40V Performance Data Load Regulation | Vin = 30V 7% [_ Parameter [Conditions | Reaut | 1A 5 lou $ 24 Wout = ov 2300 mA | con | Isolated Forward Converter - Ls ‘As described previously, forward converters exhibit lower Line Regulation | Vout = 50V @300 mA ‘output ripple voltage and the opto-coupler feedback 12V < Vin < 30V. scheme provides good regulation as well as input to output Load Regulation | Vin = 18V isolation. ; ; , Vout = 50V 0.2% An opto-coupler feedback is usually difficult to implement 50mA < leat < 900mA because the transfer function of the opto-coupler is non-lin- at ear, the current transfer ratio changes with time and temper- ture and also from one unit to another. Figure 8 shows the circuit diagram of a 5V @ 3A power converter with an input voltage range of + 14V to +30V using an isolated forward topology. vw :
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1 2 . © 470 pF 330yF | NF ov D = Unitrode UES1902 T = Puloe Engineering PE64428 fo = 100 kHz Nout (min) = 50 mA Ed = ‘* ELECTROLYTIC CAPACITOR TUK/6746~11 ‘A 12V to GOV input Voltage Range is possible by replacing the HS7067 with a HS7107. The converter will operate in a discontinuous mode above SOV with a 300 mA load (the transformers secondery current drops to zero before the ewitch tums on) and therefore, may generate more switching noise. FIGURE 6, Flyback Step-Up Converter 2-10
the transformer to about ON, and destroying the pass tran- at least 10 pF. IGURE 10. Duty Cycle Limiting Circutt the overall voltage exceeds the maximum rating. For any converter, connecting a large capacitor (20 to 330 uF capacitor of average quality. | er), which will cause the pass transistor to turn off. be decoupled with a ceramic capacitor of 1 nF to 10 nF. oscillations and instabilities. FIGURE 11. Current Limit Circultry TUKIGTAB-16 Circuit ground, is highly recommended.