5V, 4A DC-DC Switchmode Power Supply

Objective

Design, simulate, construct and make measurements on a DC-to-DC 5 V 4 A switchmode power supply.

Features

  • Nominal Input Voltage: 24 V
  • Input DC Voltage Range: 20 - 30 V
  • Output DC Voltage: 5 V
  • Output Load Current: 0 - 4 A
  • Peak-to-Peak Out Voltage Ripple: ~400 mV
  • Switch Frequency: 100 kHz

Key Hardware

  • IRF530 MOSFET (RDS = 0.12 Ω)
  • BYW29-200 Diode (Recovery Time 25 ns, should be a Schottky diode)
  • SG3524 SMPS Control Circuit
  • BC327 PNP BPJ Transistor
  • BC337 NPN BPJ Transistor
  • RM8 Solid (F44) Transformer Ferrite Core
  • RM10 Solid (F44) Inductor Ferrite Core
  • 470 uF 67 V Electrolytic Capacitor (Should be larger to reduce output voltage ripple)

Downloads & Documentation

Photos

5V, 4A DC-DC Switchmode Power Supply

5V, 4A DC-DC Switchmode Power Supply Above

5V, 4A DC-DC Switchmode Power Supply Top

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