RL1500100

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Document overview

• Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
• PDF pages: 28

Technical content

Features

• 3.3 V , 5.0 V , 12 V , 15 V , and Adjustable Output Versions
• Adjustable Version Output V oltage Range of 1.23 V to 37 V ±4% Maximum Over Line and Load Conditions
• Guaranteed 1.0 A Output Current
• Wide Input V oltage Range: 4.75 V to 40 V
• Requires Only 4 External Components
• 52 kHz Fixed Frequency Internal Oscillator
• TTL Shutdown Capability, Low Power Standby Mode
• High Efficiency
• Uses Readily Available Standard Inductors
• Thermal Shutdown and Current Limit Protection
• Moisture Sensitivity Level (MSL) Equals 1
• Pb−Free Packages are Available*

Applications

• Simple and High−Efficiency Step−Down (Buck) Regulators
• Efficient Pre−Regulator for Linear Regulators
• On−Card Switching Regulators
• Positive to Negative Converters (Buck−Boost)
• Negative Step−Up Converters
• Power Supply for Battery Chargers *For additional information on our Pb−Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. See detailed ordering and shipping information in the package dimensions section on page 25 of this data sheet.

ORDERING INFORMATION

TO−220 TV SUFFIX CASE 314B Heatsink surface connected to Pin 3 TO−220 T SUFFIX CASE 314D Pin 1. V in 2. Output 3. Ground 4. Feedback 5. ON /OFF D2PAK D2T SUFFIX CASE 936A Heatsink surface (shown as terminal 6 in case outline drawing) is connected to Pin 3 See general marking information in the device marking section on page 26 of this data sheet. DEVICE MARKING INFORMATION http://onsemi.com

Figure 1. Block Diagram and Typical Application

7.0 V - 40 V

1.0 Amp

5.0 V Regulated

This device contains 162 active transistors.

LM2575, NCV2575 http://onsemi.com OPERATING RATINGS (Operating Ratings indicate conditions for which the device is intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics.) Rating Symbol Value Unit Operating Junction Temperature Range TJ −40 to +125 °C Supply Voltage Vin 40 V SYSTEM PARAMETERS ([Note 1] Test Circuit Figure 14) ELECTRICAL CHARACTERISTICS (Unless otherwise specified, Vin = 12 V for the 3.3 V, 5.0 V, and Adjustable version, Vin = 25 V for the 12 V version, and Vin = 30 V for the 15 V version. ILoad = 200 mA. For typical values TJ = 25°C, for min/max values TJ is the operating junction temperature range that applies [Note 2], unless otherwise noted.) Characteristics Symbol Min Typ Max Unit LM2575−3.3 (Note 1 Test Circuit Figure 14) Output Voltage (Vin = 12 V, ILoad = 0.2 A, TJ = 25°C) Vout 3.234 3.3 3.366 V Output Voltage (4.75 V ≤ Vin ≤ 40 V, 0.2 A ≤ ILoad ≤ 1.0 A) Vout V TJ = 25°C 3.168 3.3 3.432 TJ = −40 to +125°C 3.135 − 3.465 Efficiency (Vin = 12 V, ILoad = 1.0 A) η − 75 − % LM2575−5 ([Note 1] Test Circuit Figure 14) Output Voltage (Vin = 12 V, ILoad = 0.2 A, TJ = 25°C) Vout 4.9 5.0 5.1 V Output Voltage (8.0 V ≤ Vin ≤ 40 V, 0.2 A ≤ ILoad ≤ 1.0 A) Vout V TJ = 25°C 4.8 5.0 5.2 TJ = −40 to +125°C 4.75 − 5.25 Efficiency (Vin = 12 V, ILoad = 1.0 A) η − 77 − % LM2575−12 (Note 1 Test Circuit Figure 14) Output Voltage (Vin = 25 V, ILoad = 0.2 A, TJ = 25°C) Vout 11.76 12 12.24 V Output Voltage (15 V ≤ Vin ≤ 40 V, 0.2 A ≤ ILoad ≤ 1.0 A) Vout V TJ = 25°C 11.52 12 12.48 TJ = −40 to +125°C 11.4 − 12.6 Efficiency (Vin = 15V, ILoad = 1.0 A) η − 88 − % LM2575−15 (Note 1 Test Circuit Figure 14) Output Voltage (Vin = 30 V, ILoad = 0.2 A, TJ = 25°C) Vout 14.7 15 15.3 V Output Voltage (18 V ≤ Vin ≤ 40 V, 0.2 A ≤ ILoad ≤ 1.0 A) Vout V TJ = 25°C 14.4 15 15.6 TJ = −40 to +125°C 14.25 − 15.75 Efficiency (Vin = 18 V, ILoad = 1.0 A) η − 88 − % LM2575 ADJUSTABLE VERSION (Note 1 Test Circuit Figure 14) Feedback Voltage (8.0 V ≤ Vin ≤ 40 V, 0.2 A ≤ ILoad ≤ 1.0 A, Vout = 5.0 V) VFB V TJ = 25°C 1.193 1.23 1.267 TJ = −40 to +125°C 1.18 − 1.28 Efficiency (Vin = 12 V, ILoad = 1.0 A, Vout = 5.0 V) η − 77 − % 1. External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system perf ormance. When the LM2575 is used as shown in the Figure 14 test circuit, system performance will be as shown in system parameters section. 2. Tested junction temperature range for the LM2575 and the NCV2575: T low = −40°C Thigh = +125°C

LM2575, NCV2575 http://onsemi.com DEVICE PARAMETERS ELECTRICAL CHARACTERISTICS (Unless otherwise specified, Vin = 12 V for the 3.3 V, 5.0 V, and Adjustable version, Vin = 25 V for the 12 V version, and Vin = 30 V for the 15 V version. ILoad = 200 mA. For typical values TJ = 25°C, for min/max values TJ is the operating junction temperature range that applies [Note 2], unless otherwise noted.) Characteristics Symbol Min Typ Max Unit ALL OUTPUT VOLTAGE VERSIONS Feedback Bias Current (Vout = 5.0 V Adjustable Version Only) Ib nA TJ = 25°C − 25 100 TJ = −40 to +125°C − − 200 Oscillator Frequency Note 3 fosc kHz TJ = 25°C − 52 − TJ = 0 to +125°C 47 − 58 TJ = −40 to +125°C 42 − 63 Saturation Voltage (Iout = 1.0 A Note 4) Vsat V Max Duty Cycle (“on”) Note 5 DC 94 98 − % Current Limit (Peak Current Notes 4 and 3) ICL A TJ = 25°C 1.7 2.3 3.0 TJ = −40 to +125°C 1.4 − 3.2 Output Leakage Current Notes 6 and 7, TJ = 25°C IL mA Output = 0 V − 0.8 2.0 Output = −1.0 V − 6.0 20 Quiescent Current Note 6 IQ mA TJ = −40 to +125°C − − 11 Standby Quiescent Current (ON/OFF Pin = 5.0 V (“off”)) Istby /C0109A TJ = 25°C 15 80 200 TJ = −40 to +125°C − − 400 ON/OFF Pin Logic Input Level (Test Circuit Figure 14) V Vout = 0 V VIH Vout = Nominal Output Voltage VIL ON/OFF Pin Input Current (Test Circuit Figure 14) /C0109A ON/OFF Pin = 5.0 V (“off”), TJ = 25°C IIH − 15 30 ON/OFF Pin = 0 V (“on”), TJ = 25°C IIL − 0 5.0 3. 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 dissipation of the IC by lowering the minimum duty cycle from 5% down to approximately 2%. 4. Output (Pin 2) sourcing current. No diode, inductor or capacitor connected to output pin. 5. Feedback (Pin 4) removed from output and connected to 0 V. 6. Feedback (Pin 4) removed from output and connected to +12 V for the Adjustable, 3.3 V, and 5.0 V versions, and +25 V for the 12 V and 15 V versions, to force the output transistor “off”. 7. V in = 40 V.

Figure 2. Normalized Output Voltage Figure 3. Line Regulation Figure 4. Switch Saturation Voltage Figure 5. Current Limit Figure 6. Dropout Voltage Figure 7. Quiescent Current

12 V and 15 V

Figure 14. Typical Test Circuit

8.0 V - 40 V

5.0 Output Voltage Versions

indicated by heavy lines should be kept as short as possible. ground plane construction should be used.

Figure 16. Buck Converter Idealized Waveforms

LM2575, NCV2575 http://onsemi.com Procedure (Fixed Output Voltage Version) In order to simplify the switching regulator design, a step −by−step design procedure and example is provided. Procedure Example Given Parameters: Vout = Regulated Output Voltage (3.3 V, 5.0 V, 12 V or 15 V) Vin(max) = Maximum DC Input Voltage ILoad(max) = Maximum Load Current Given Parameters: Vout = 5.0 V Vin(max) = 20 V ILoad(max) = 0.8 A 1. Controller IC Selection According to the required input voltage, output voltage and current, select the appropriate type of the controller IC output voltage version. 1. Controller IC Selection According to the required input voltage, output voltage, current polarity and current value, use the LM2575−5 controller IC 2. Input Capacitor Selection (C in) To prevent large voltage transients from appearing at the input and for stable operation of the converter, an aluminium or tantalum electrolytic bypass capacitor is needed between the input pin +Vin and ground pin GND. This capacitor should be located close to the IC using short leads. This capacitor should have a low ESR (Equivalent Series Resistance) value. 2. Input Capacitor Selection (C in) A 47 /C0109F, 25 V aluminium electrolytic capacitor located near to the input and ground pins provides sufficient bypassing. 3. Catch Diode Selection (D1) A. Since the diode maximum peak current exceeds the regulator maximum load current the catch diode current rating must be at least 1.2 times greater than the maximum load current. For a robust design the diode should have a current rating equal to the maximum current limit of the LM2575 to be able to withstand a continuous output short B. The reverse voltage rating of the diode should be at least 1.25 times the maximum input voltage. 3. Catch Diode Selection (D1) A. For this example the current rating of the diode is 1.0 A. B. Use a 30 V 1N5818 Schottky diode, or any of the suggested fast recovery diodes shown in the Table 4. 4. Inductor Selection (L1) A. According to the required working conditions, select the correct inductor value using the selection guide from Figures 17 to 21. B. From the appropriate inductor selection guide, identify the inductance region intersected by the Maximum Input Voltage line and the Maximum Load Current line. Each region is identified by an inductance value and an inductor code. C. Select an appropriate inductor from the several different manufacturers part numbers listed in Table 1 or Table 2. When using Table 2 for selecting the right inductor the designer must realize that the inductor current rating must be higher than the maximum peak current flowing through the inductor. This maximum peak current can be calculated as follows: where t on is the “on” time of the power switch and For additional information about the inductor, see the inductor section in the “External Components” section of this data sheet. Ip(max) /C0043ILoad(max) /C0041 /C0466VinVout/C0467ton ton /C0043 Vout Vin x 1 fosc 4. Inductor Selection (L1) A. Use the inductor selection guide shown in Figures 17 to 21. B. From the selection guide, the inductance area intersected by the 20 V line and 0.8 A line is L330. C. Inductor value required is 330 /C0109H. From the Table 1 or Table 2, choose an inductor from any of the listed manufacturers.

LM2575, NCV2575 http://onsemi.com Procedure (Fixed Output Voltage Version) (continued)In order to simplify the switching regulator design, a step−by−step design procedure and example is provided. Procedure Example 5. Output Capacitor Selection (C out) A. Since the LM2575 is a forward−mode switching regulator with voltage mode control, its open loop 2−pole−2−zero frequency characteristic has the dominant pole−pair determined by the output capacitor and inductor values. For stable operation and an acceptable ripple voltage, (approximately 1% of the output voltage) a value between 100 /C0109F and 470 /C0109F is recommended. B. Due to the fact that the higher voltage electrolytic capacitors generally have lower ESR (Equivalent Series Resistance) numbers, the output capacitor’s voltage rating should be at least 1.5 times greater than the output voltage. For a 5.0 V regulator, a rating at least 8V is appropriate, and a 10 V or 16 V rating is recommended. 5. Output Capacitor Selection (C out) A. Cout = 100 /C0109F to 470 /C0109F standard aluminium electrolytic. B. Capacitor voltage rating = 16 V. Procedure (Adjustable Output Version: LM2575−Adj) Procedure Example Given Parameters: Vout = Regulated Output Voltage Vin(max) = Maximum DC Input Voltage ILoad(max) = Maximum Load Current Given Parameters: Vout = 8.0 V Vin(max) = 12 V ILoad(max) = 1.0 A 1. Programming Output Voltage To select the right programming resistor R1 and R2 value (see Figure 14) use the following formula: Resistor R1 can be between 1.0 k and 5.0 k/C0087. (For best temperature coefficient and stability with time, use 1% metal film resistors). Vout /C0043Vref /C04661 /C0041R2 R1/C0467 R2 /C0043R1/C0466 Vout Vref 1/C0467 where Vref = 1.23 V 1. Programming Output Voltage (selecting R1 and R2) Select R1 and R2: R2 = 9.91 k/C0087, choose a 9.88 k metal film resistor. R2 /C0043R1/C0466 Vout Vref /C00421/C0467/C00431.8 k/C04668.0 V

1.23 V /C00421/C0467

Vout /C00431.23/C04661 /C0041R2 R1/C0467Select R1 = 1.8 k/C0087 2. Input Capacitor Selection (C in) To prevent large voltage transients from appearing at the input and for stable operation of the converter, an aluminium or tantalum electrolytic bypass capacitor is needed between the input pin +Vin and ground pin GND This capacitor should be located close to the IC using short leads. This capacitor should have a low ESR (Equivalent Series Resistance) value. For additional information see input capacitor section in the “External Components” section of this data sheet. 2. Input Capacitor Selection (C in) A 100 /C0109F aluminium electrolytic capacitor located near the input and ground pin provides sufficient bypassing. 3. Catch Diode Selection (D1) A. Since the diode maximum peak current exceeds the regulator maximum load current the catch diode current rating must be at least 1.2 times greater than the maximum load current. For a robust design, the diode should have a current rating equal to the maximum current limit of the LM2575 to be able to withstand a continuous output short. B. The reverse voltage rating of the diode should be at least 1.25 times the maximum input voltage. 3. Catch Diode Selection (D1) A. For this example, a 3.0 A current rating is adequate. B. Use a 20 V 1N5820 or MBR320 Schottky diode or any suggested fast recovery diode in the Table 4.

LM2575, NCV2575 http://onsemi.com Procedure (Adjustable Output Version: LM2575−Adj) (continued) Procedure Example 4. Inductor Selection (L1) A. Use the following formula to calculate the inductor Volt x microsecond [V x /C0109s] constant: B. Match the calculated E x T value with the corresponding number on the vertical axis of the Inductor Value Selection Guide shown in Figure 21. This E x T constant is a measure of the energy handling capability of an inductor and is dependent upon the type of core, the core area, the number of turns, and the duty cycle. C. Next step is to identify the inductance region intersected by the E x T value and the maximum load current value on the horizontal axis shown in Figure 21. D. From the inductor code, identify the inductor value. Then select an appropriate inductor from the Table 1 or Table 2. The inductor chosen must be rated for a switching frequency of 52 kHz and for a current rating of 1.15 x I Ioad. The inductor current rating can also be determined by calculating the inductor peak current: where ton is the “on” time of the power switch and For additional information about the inductor, see the inductor section in the “External Components” section of this data sheet. ExT /C0043 /C0466Vin Vout/C0467 Vout Von x 106 F[Hz] [V x /C0109s] Ip(max) /C0043ILoad(max) /C0041 /C0466Vin Vout/C0467ton ton /C0043 Vout Vin x 1 fosc 4. Inductor Selection (L1) A. Calculate E x T [V x /C0109s] constant: B. E x T = 51 [V x /C0109s] C. ILoad(max) = 1.0 A Inductance Region = L220 D. Proper inductor value = 220 /C0109H Choose the inductor from the Table 1 or Table 2. ExT /C0043/C046612 8.0/C0467x 8.0 12 x 1000 52 /C004351 [V x /C0109s] 5. Output Capacitor Selection (C out) A. Since the LM2575 is a forward−mode switching regulator with voltage mode control, its open loop 2−pole−2−zero frequency characteristic has the dominant pole−pair determined by the output capacitor and inductor values. For stable operation, the capacitor must satisfy the following requirement: B. Capacitor values between 10 /C0109F and 2000 /C0109F will satisfy the loop requirements for stable operation. To achieve an acceptable output ripple voltage and transient response, the output capacitor may need to be several times larger than the above formula yields. C. Due to the fact that the higher voltage electrolytic capacitors generally have lower ESR (Equivalent Series Resistance) numbers, the output capacitor’s voltage rating should be at least 1.5 times greater than the output voltage. For a 5.0 V regulator, a rating of at least 8V is appropriate, and a 10 V or 16 V rating is recommended. Cout /C01197.785 Vin(max) Vout xL[ μH] [μF] 5. Output Capacitor Selection (C out) To achieve an acceptable ripple voltage, select Cout = 100 /C0109F electrolytic capacitor. Cout /C01197.785 12 8.220 /C004353 μF

Table 1. Inductor Selection Guide Table 2. Inductor Selection Guide

Table 3. Example of Several Inductor Manufacturers Phone/Fax Numbers Table 4. Diode Selection Guide gives an overview about both surface−mount and through−hole diodes for an effective design. Device listed in bold are available from ON Semiconductor.

20 V SK12 1N5817

30 V MBRS130LT3

40 V MBRS140T3

50 V MBRS150

LM2575, NCV2575 http://onsemi.com EXTERNAL COMPONENTS Input Capacitor (Cin) The Input Capacitor Should Have a Low ESR For stable operation of the switch mode converter a low ESR (Equivalent Series Resistance) aluminium or solid tantalum bypass capacitor is needed between the input pin and the ground pin to prevent large voltage transients from appearing at the input. It must be located near the regulator and use short leads. With most electrolytic capacitors, the capacitance value decreases and the ESR increases with lower temperatures. For reliable operation in temperatures below −25°C larger values of the input capacitor may be needed. Also paralleling a ceramic or solid tantalum capacitor will increase the regulator stability at cold temperatures. RMS Current Rating of Cin The important parameter of the input capacitor is the RMS current rating. Capacitors that are physically large and have large surface area will typically have higher RMS current ratings. For a given capacitor value, a higher voltage electrolytic capacitor will be physically larger than a lower voltage capacitor, and thus be able to dissipate more heat to the surrounding air, and therefore will have a higher RMS current rating. The consequence of operating an electrolytic capacitor above the RMS current rating is a shortened operating life. In order to assure maximum capacitor operating lifetime, the capacitor’s RMS ripple current rating should be: Irms > 1.2 x d x ILoad where d is the duty cycle, for a buck regulator d /C0043ton T /C0043 Vout Vin and d /C0043ton T /C0043 |Vout| |Vout| /C0041Vin for a buck/C0042boost regulator. Output Capacitor (Cout) For low output ripple voltage and good stability, low ESR output capacitors are recommended. An output capacitor has two main functions: it filters the output and provides regulator loop stability. The ESR of the output capacitor and the peak−to−peak value of the inductor ripple current are the main factors contributing to the output ripple voltage value. Standard aluminium electrolytics could be adequate for some applications but for quality design low ESR types are recommended. An aluminium electrolytic capacitor’s ESR value is related to many factors such as the capacitance value, the voltage rating, the physical size and the type of construction. In most cases, the higher voltage electrolytic capacitors have lower ESR value. Often capacitors with much higher voltage ratings may be needed to provide low ESR values that are required for low output ripple voltage. The Output Capacitor Requires an ESR Value That Has an Upper and Lower Limit As mentioned above, a low ESR value is needed for low output ripple voltage, typically 1% to 2% of the output voltage. But if the selected capacitor’s ESR is extremely low (below 0.05 /C0087), there is a possibility of an unstable feedback loop, resulting in oscillation at the output. This situation can occur when a tantalum capacitor, that can have a very low ESR, is used as the only output capacitor. At Low Temperatures, Put in Parallel Aluminium Electrolytic Capacitors with Tantalum Capacitors Electrolytic capacitors are not recommended for temperatures below −25°C. The ESR rises dramatically at cold temperatures and typically rises 3 times at −25°C and as much as 10 times at −40°C. Solid tantalum capacitors have much better ESR spec at cold temperatures and are recommended for temperatures below −25°C. They can be also used in parallel with aluminium electrolytics. The value of the tantalum capacitor should be about 10% or 20% of the total capacitance. The output capacitor should have at least 50% higher RMS ripple current rating at 52 kHz than the peak−to−peak inductor ripple current. Catch Diode Locate the Catch Diode Close to the LM2575 The LM2575 is a step−down buck converter; it requires a fast diode to provide a return path for the inductor current when the switch turns off. This diode must be located close to the LM2575 using short leads and short printed circuit traces to avoid EMI problems. Use a Schottky or a Soft Switching Ultra−Fast Recovery Diode Since the rectifier diodes are very significant source of losses within switching power supplies, choosing the rectifier that best fits into the converter design is an important process. Schottky diodes provide the best performance because of their fast switching speed and low forward voltage drop. They provide the best efficiency especially in low output voltage applications (5.0 V and lower). Another choice could be Fast−Recovery, or Ultra−Fast Recovery diodes. It has to be noted, that some types of these diodes with an abrupt turnoff characteristic may cause instability or EMI troubles. A fast−recovery diode with soft recovery characteristics can better fulfill a quality, low noise design requirements. Table 4 provides a list of suitable diodes for the LM2575 regulator. Standard 50/60 Hz rectifier diodes such as the 1N4001 series or 1N5400 series are NOT suitable. Inductor The magnetic components are the cornerstone of all switching power supply designs. The style of the core and the winding technique used in the magnetic component’s design has a great influence on the reliability of the overall power supply. Using an improper or poorly designed inductor can cause high voltage spikes generated by the rate of transitions in current within the switching power supply, and the possibility of core saturation can arise during an abnormal operational mode. V oltage spikes can cause the semiconductors to enter avalanche breakdown and the part can instantly fail if enough energy is applied. It can also

turn−off can be neglected if proper type catch diode is used. R/C0113SA is the thermal resistance heatsink−ambient. surrounding air is moving or still. Figure 25. Inverting Buck−Boost Regulator Using the

12 V to 25 V

senses the inverted output voltage and regulates it. 0.35 A to the output when the input voltage is 12 V or higher. value, is either greater or less than the input voltage. available output current is lower. a current limit less than 1.5 A. voltage and size of the output capacitor. or an undervoltage lockout circuit is recommended.

regulator begins to operate. supplied by the input capacitor Cin. capacitor (in the range of thousands of /C0109F). inductor peak current has to be calculated. conditions, the worst case occurs when Vin is minimal. Figure 26. Inverting Buck−Boost applied to a buck −boost converter is shown in Figure 26 . Figure 27. Inverting Buck−Boost Regulator Shut Down

35 GNDON/OFF

NOTE: This picture does not show the complete circuit. down methods, two of them are shown in Figures 27 and 28. Figure 28. Inverting Buck−Boost Regulator Shut Down NOTE: This picture does not show the complete circuit. lower output load current capability. from −5.0 V to −12 V and provides a regulated −12 V output.

above −12 V accordingly, but will not damage the regulator. Figure 29. Negative Boost Regulator

53 ON/OFFGND

as a fuse, may be necessary to provide the load protection. limited, this delayed startup feature becomes very useful. current, but its use is not mandatory. on and off with the line (or double) frequency. Figure 30. Delayed Startup Circuitry NOTE: This picture does not show the complete circuit. Figure 31. Undervoltage Lockout Circuit for NOTE: This picture does not show the complete circuit.

Figure 32. Undervoltage Lockout Circuit for NOTE: This picture does not show the complete circuit. features an adjustable output voltage is shown in Figure 33. This regulator delivers 1.0 A into 1.2 V to 35 V output. additional L−C filter is included in this circuit. Figure 33. Adjustable Power Supply with Low Ripple Voltage Figure 34. D2PAK Thermal Resistance and Maximum

Figure 38. Schematic Diagram of the 8.0 V @ 1.0 V Step−Down Converter Using the LM2575−Adj Figure 39. PC Board Component Side Figure 40. PC Board Copper Side

4 Feedback

NOTE: Not to scale. NOTE: Not to scale .

• National Semiconductor LM2575 Data Sheet and Application Note
• National Semiconductor LM2595 Data Sheet and Application Note
• Marty Brown “Practical Switching Power Supply Design”, Academic Press, Inc., San Diego 1990
• Ray Ridley “High Frequency Magnetics Design”, Ridley Engineering, Inc. 1995

LM2575, NCV2575 http://onsemi.com Temperature Range Package Shipping† LM2575TV−ADJG

1.23 V to 37 V TJ = −40° to +125°C

TO−220 (Vertical Mount) (Pb−Free)

50 Units/RailLM2575T−ADJG TO−220 (Straight Lead)

(Pb−Free) LM2575D2T−ADJG D2PAK (Surface Mount) (Pb−Free) LM2575D2T−ADJR4G D2PAK (Surface Mount) (Pb−Free) 800 Tape & Reel NCV2575D2T−ADJG D2PAK (Surface Mount) (Pb−Free) 50 Units/Rail NCV2575D2T−ADJR4G D2PAK (Surface Mount) (Pb−Free) 800 Tape & Reel LM2575TV−3.3G

3.3 V TJ = −40° to +125°C

TO−220 (Vertical Mount) (Pb−Free) 50 Units/RailLM2575T−3.3G TO−220 (Straight Lead) (Pb−Free) LM2575D2T−3.3G D2PAK (Surface Mount) (Pb−Free) LM2575D2T−3.3R4G D2PAK (Surface Mount) (Pb−Free) 800 Tape & Reel LM2575TV−5G

5.0 V TJ = −40° to +125°C

TO−220 (Vertical Mount) (Pb−Free)

50 Units/RailLM2575T−5G TO−220 (Straight Lead)

(Pb−Free) LM2575D2T−5G D2PAK (Surface Mount) (Pb−Free) LM2575D2T−5R4G D2PAK (Surface Mount) (Pb−Free) 800 Tape & Reel NCV2575D2T−5G D2PAK (Surface Mount) (Pb−Free) 50 Units/Rail NCV2575D2T−5R4G D2PAK (Surface Mount) (Pb−Free) 800 Tape & Reel LM2575TV−012G

12 V TJ = −40° to +125°C

TO−220 (Vertical Mount) (Pb−Free)

50 Units/RailLM2575T−012G TO−220 (Straight Lead)

(Pb−Free) LM2575D2T−012G D2PAK (Surface Mount) (Pb−Free) LM2575D2T−12R4G D2PAK (Surface Mount) (Pb−Free) 800 Tape & Reel NCV2575D2T−12G D2PAK (Surface Mount) (Pb−Free) 50 Units/Rail NCV2575D2T−12R4G D2PAK (Surface Mount) (Pb−Free) 800 Tape & Reel †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D.

LM2575, NCV2575 http://onsemi.com Device Shipping†Package Operating Temperature Range Nominal Output Voltage LM2575TV−015G

15 V TJ = −40° to +125°C

TO−220 (Vertical Mount) (Pb−Free)

50 Units/RailLM2575T−015G TO−220 (Straight Lead)

(Pb−Free) LM2575D2T−015G D2PAK (Surface Mount) (Pb−Free) LM2575D2T−15R4G D2PAK (Surface Mount) (Pb−Free) 800 Tape & Reel †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. xxx = 3.3, 5.0, 12, 15, or ADJ A = Assembly Location WL = Wafer Lot Y = Year WW = Work Week G = Pb −Free Package TO−220 TV SUFFIX CASE 314B MARKING DIAGRAMS TO−220 T SUFFIX CASE 314D D2PAK D2T SUFFIX CASE 936A LM 2575T−xxx AWLYWWG LM 2575T−xxx AWLYWWG LM 2575−xxx AWLYWWG D2PAK D2T SUFFIX CASE 936A NC V2575−xxx AWLYWWG

LM2575, NCV2575 http://onsemi.com PACKAGE DIMENSIONS TO−220 TV SUFFIX CASE 314B−05 ISSUE L V Q K F U A B G −P− M0.10 (0.254) P MT 5X J M0.24 (0.610) T OPTIONAL CHAMFER S L W E C H N −T− SEATING PLANE NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. 3. DIMENSION D DOES NOT INCLUDE INTERCONNECT BAR (DAMBAR) PROTRUSION. DIMENSION D INCLUDING PROTRUSION SHALL NOT EXCEED 0.043 (1.092) MAXIMUM. DIM MIN MAX MIN MAX MILLIMETERSINCHES A 0.572 0.613 14.529 15.570 B 0.390 0.415 9.906 10.541 C 0.170 0.180 4.318 4.572 D 0.025 0.038 0.635 0.965 E 0.048 0.055 1.219 1.397 F 0.850 0.935 21.590 23.749 G 0.067 BSC 1.702 BSC H 0.166 BSC 4.216 BSC J 0.015 0.025 0.381 0.635 K 0.900 1.100 22.860 27.940 L 0.320 0.365 8.128 9.271 N 0.320 BSC 8.128 BSC Q 0.140 0.153 3.556 3.886 U 0.468 0.505 11.888 12.827 W 0.090 0.110 2.286 2.794 5X D TO−220 T SUFFIX CASE 314D−04 ISSUE F −Q− 12345 U K D G A 5 PL J H L E C MQM0.356 (0.014) T SEATING PLANE−T− DIM MIN MAX MIN MAX MILLIMETERSINCHES A 0.572 0.613 14.529 15.570 B 0.390 0.415 9.906 10.541 C 0.170 0.180 4.318 4.572 D 0.025 0.038 0.635 0.965 E 0.048 0.055 1.219 1.397 G 0.067 BSC 1.702 BSC H 0.087 0.112 2.210 2.845 J 0.015 0.025 0.381 0.635 K 0.977 1.045 24.810 26.543 L 0.320 0.365 8.128 9.271 Q 0.140 0.153 3.556 3.886 U 0.105 0.117 2.667 2.972 NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. 3. DIMENSION D DOES NOT INCLUDE INTERCONNECT BAR (DAMBAR) PROTRUSION. DIMENSION D INCLUDING PROTRUSION SHALL NOT EXCEED 10.92 (0.043) MAXIMUM. B1 0.375 0.415 9.525 10.541 B DETAIL A-A B DETAIL A−A

LM2575, NCV2575 http://onsemi.com PACKAGE DIMENSIONS D2PAK D2T SUFFIX CASE 936A−02 ISSUE C

5 REF

A 12 3 K B S H D G C E M L PN R V U TERMINAL 6 NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. 3. TAB CONTOUR OPTIONAL WITHIN DIMENSIONS A AND K. 4. DIMENSIONS U AND V ESTABLISH A MINIMUM MOUNTING SURFACE FOR TERMINAL 6. 5. DIMENSIONS A AND B DO NOT INCLUDE MOLD FLASH OR GATE PROTRUSIONS. MOLD FLASH AND GATE PROTRUSIONS NOT TO EXCEED 0.025 (0.635) MAXIMUM. DIM A MIN MAX MIN MAX MILLIMETERS 0.386 0.403 9.804 10.236 INCHES B 0.356 0.368 9.042 9.347 C 0.170 0.180 4.318 4.572 D 0.026 0.036 0.660 0.914 E 0.045 0.055 1.143 1.397 G 0.067 BSC 1.702 BSC H 0.539 0.579 13.691 14.707 K 0.050 REF 1.270 REF L 0.000 0.010 0.000 0.254 M 0.088 0.102 2.235 2.591 N 0.018 0.026 0.457 0.660 P 0.058 0.078 1.473 1.981 R 5 REF S 0.116 REF 2.946 REF U 0.200 MIN 5.080 MIN V 0.250 MIN 6.350 MIN /C0095/C0095 M0.010 (0.254) T −T− OPTIONAL CHAMFER 8.38 0.33 1.016 0.04 16.02 0.63 10.66 0.42 3.05 0.12 1.702 0.067 SCALE 3:1 /C0466mm inches/C0467 *For additional information on our Pb−Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. SOLDERING FOOTPRINT* ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, direct ly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner. LM2575/D PUBLICATION ORDERING INFORMATION N. American Technical Support: 800−282−9855 Toll Free USA/Canada Europe, Middle East and Africa Technical Support: Phone: 421 33 790 2910 Japan Customer Focus Center Phone: 81−3−5773−3850 LITERATURE FULFILLMENT: Literature Distribution Center for ON Semiconductor P.O. Box 5163, Denver, Colorado 80217 USA Phone: 303−675−2175 or 800−344−3860 Toll Free USA/Canada Fax: 303−675−2176 or 800−344−3867 Toll Free USA/Canada Email: orderlit@onsemi.com ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative