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LM2576 3.0 A, 15 V, Step−Down Switching Regulator

LM2576 . A, 15 V, Step Down Switching Regulator The LM2576 series of regulators are monolithic integrated circuits ideally suited for easy and convenient design of a step down Switching Regulator (buck converter). All circuits of this series are capable of driving a A load with excellent line and load regulation. These devices are available in fixed output voltages of V, V, 12 V, 15 V, and an adjustable output version. These regulators were designed to minimize the number of external components to simplify the power supply design. Standard series of TO 220.

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Transcription of LM2576 3.0 A, 15 V, Step−Down Switching Regulator

1 LM2576 . A, 15 V, Step Down Switching Regulator The LM2576 series of regulators are monolithic integrated circuits ideally suited for easy and convenient design of a step down Switching Regulator (buck converter). All circuits of this series are capable of driving a A load with excellent line and load regulation. These devices are available in fixed output voltages of V, V, 12 V, 15 V, and an adjustable output version. These regulators were designed to minimize the number of external components to simplify the power supply design. Standard series of TO 220.

2 1 TV SUFFIX. inductors optimized for use with the LM2576 are offered by several CASE 314B. different inductor manufacturers. 5. Since the LM2576 converter is a switch mode power supply, its Heatsink surface connected to Pin 3. efficiency is significantly higher in comparison with popular three terminal linear regulators , especially with higher input voltages. In many cases, the power dissipated is so low that no heatsink is required or its size could be reduced dramatically. A standard series of inductors optimized for use with the LM2576 . are available from several different manufacturers.

3 This feature TO 220. greatly simplifies the design of switch mode power supplies. T SUFFIX. The LM2576 features include a guaranteed 4% tolerance on output CASE 314D. 1. voltage within specified input voltages and output load conditions, and 10% on the oscillator frequency ( 2% over 0 C to 125 C). External 5. shutdown is included, featuring 80 mA (typical) standby current. The Pin 1. Vin output switch includes cycle by cycle current limiting, as well as 2. Output thermal shutdown for full protection under fault conditions. 3. Ground 4. Feedback Features 5.

4 ON/OFF. V, V, 12 V, 15 V, and Adjustable Output Versions Adjustable Version Output Voltage Range, to 37 V 4%. Maximum Over Line and Load Conditions Guaranteed A Output Current D2 PAK. Wide Input Voltage Range 1. D2T SUFFIX. CASE 936A. Requires Only 4 External Components 5. 52 kHz Fixed Frequency Internal Oscillator Heatsink surface (shown as terminal 6 in TTL Shutdown Capability, Low Power Standby Mode case outline drawing) is connected to Pin 3. High Efficiency Uses Readily Available Standard Inductors ORDERING INFORMATION. Thermal Shutdown and Current Limit Protection See detailed ordering and shipping information in the package dimensions section on page 24 of this data sheet.

5 Moisture Sensitivity Level (MSL) Equals 1. Pb Free Packages are Available DEVICE MARKING INFORMATION. See general marking information in the device marking Applications section on page 25 of this data sheet. Simple High Efficiency Step Down (Buck) Regulator Efficient Pre Regulator for Linear regulators On Card Switching regulators Positive to Negative Converter (Buck Boost). Negative Step Up Converters Power Supply for Battery Chargers Semiconductor Components Industries, LLC, 2006 1 Publication Order Number: January, 2006 Rev. 8 LM2576 /D. LM2576 . Typical Application (Fixed Output Voltage Versions).

6 Feedback V 40 V +Vin 4 L1. LM2576 100 mH. Unregulated DC Input 1 Output V Regulated Cin Output A Load 100 mF 2 D1. 3 GN 5 ON/OFF 1N5822 Cout D 1000 mF. Representative Block Diagram and Typical Application Unregulated +Vin V Internal ON/OFF. ON/OFF Output R2. DC Input Regulator Voltage Versions (W). 1 5. Cin V k 4 V k 12 V k Feedback 15 V k Current R2 Fixed Gain Limit For adjustable version Error Amplifier Comparator R1 = open, R2 = 0 W. Driver Regulated R1. Freq Latch Output k L1 Vout Shift Output 18 kHz Amp 2. V Switch GND D1 Cout Band Gap 52 kHz Thermal Reference Reset 3 Load Oscillator Shutdown This device contains 162 active transistors.

7 Figure 1. Block Diagram and Typical Application MAXIMUM RATINGS. Rating Symbol Value Unit Maximum Supply Voltage Vin 45 V. ON/OFF Pin Input Voltage V V +Vin V. Output Voltage to Ground (Steady State) V. Power Dissipation Case 314B and 314D (TO 220, 5 Lead) PD Internally Limited W. Thermal Resistance, Junction to Ambient RqJA 65 C/W. Thermal Resistance, Junction to Case RqJC C/W. Case 936A (D2 PAK) PD Internally Limited W. Thermal Resistance, Junction to Ambient RqJA 70 C/W. Thermal Resistance, Junction to Case RqJC C/W. Storage Temperature Range Tstg 65 to +150 C.

8 Minimum ESD Rating (Human Body Model: C = 100 pF, R = kW) kV. Lead Temperature (Soldering, 10 seconds) 260 C. Maximum Junction Temperature TJ 150 C. Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied, damage may occur and reliability may be affected. 2. LM2576 . OPERATING RATINGS (Operating Ratings indicate conditions for which the device is intended to be functional, but do not guarantee specific performance limits.)

9 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 15). ELECTRICAL CHARACTERISTICS (Unless otherwise specified, Vin = 12 V for the V, V, and Adjustable version, Vin = 25 V. for the 12 V version, and Vin = 30 V for the 15 V version. ILoad = 500 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.

10 Characteristics Symbol Min Typ Max Unit LM2576 (Note 1 Test Circuit Figure 15). Output Voltage (Vin = 12 V, ILoad = A, TJ = 25 C) Vout V. Output Voltage ( V Vin 40 V, A ILoad A) Vout V. TJ = 25 C TJ = 40 to +125 C Efficiency (Vin = 12 V, ILoad = A) 75 %. LM2576 5 (Note 1 Test Circuit Figure 15). Output Voltage (Vin = 12 V, ILoad = A, TJ = 25 C) Vout V. Output Voltage ( V Vin 40 V, A ILoad A) Vout V. TJ = 25 C TJ = 40 to +125 C Efficiency (Vin = 12 V, ILoad = A) 77 %. LM2576 12 (Note 1 Test Circuit Figure 15). Output Voltage (Vin = 25 V, ILoad = A, TJ = 25 C) Vout 12 V.


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