DC-DC 3-A Power Converter

Upgrade Your Fixed-Voltage Sources

DC-DC converters can be very useful on your workbench. These circuits can generate different regulated voltage outputs, from the input voltage supplied by a battery or a fixed-voltage power supply. This design can transform a 5-to-24 V DC input voltage into different, regulated output voltages that can be selected by adjusting a trimmer.

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Materials

LM2576 datasheet

PCB-Layouts.zip

Component list

Component List

Resistors

(All 0.25 W, 5%)

R1 = 1 kΩ

R2, R4 = 2.2 kΩ

R3 = 47 kΩ trimmer

R5 = 4.7 kΩ

VR1 = varistor, 45 V rms

Capacitors

C1 = 1,000 µF, 35 V, electrolytic, radial

C2 = 470 µF, 35 V, electrolytic, radial

C3 = 220 µF, 35 V, electrolytic, radial

C4 = 100 nF, 63 V, polyester

Inductors

L1 = 15 µH, 4 A, axial mount

L2 = 220 µH, 3 A, toroidal, vertical mount

Semiconductors

D1 = 6A60

D2 = MBR760, fast-recovery Schottky diode

LED1 = LED, red, 3 mm

U1 = LM2576-ADJ, TO-220

Miscellaneous

2× 2-pole screw terminal block, 5 mm pitch

5×20 Fuse, 3AT, with PCB fuse holder

32×35×20 mm TO-220 Heat

Discussion (0 comments)

BlackSeaMaker 4 months ago

Just a small remark:
although the BOM and the prototype picture show the correct U1 (LM2576-ADJ), the schematic diagram lists the LM2575-1A instead.

This component is not suitable, as it does not align with the project's 3A rating.

dc-dc-3a-powerconverter-schematic.PNG (43kb)

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