Switch mode power supply

Posted on Jul 16, 2012

This buck-derived circuit provides up to 8 A at 5 Vdc operating off 24 to 32 Vdc. The two power MOSFETs in the circuit conduct alternately for equal periods. Switching frequency is 150 kHz, set by the PWM125 controller. Output of the two MOSFETs is transformed to a low-voltage level, then rectified. Efficiency of the circuit is 75% when operated in a 22 to 32 V range.

Switch mode power supply
Click here to download the full size of the above Circuit.

Efficiency approaches 90% with higher voltage inputs.

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