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DC-DC 3-A Power Converter

Upgrade Your Fixed-Voltage Sources

DC-DC 3-A Power Converter
DC-DC 3-A Power Converter
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

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

 

 

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