Monday, February 14, 2011

Isolated Feedback Power Suplly Circuit

This is a power supply circuit using isolated feedback capabilities of the TL3103 for both current voltage sensing. This supply is powered from the AC power line and has an output of 5 Volts at 1.5 A. Both output voltage and current are sensed and the error voltages are applied to the errer amplifiers of the TL594 PWM control IS. See circuit below :
Isolated Feedback Power Supply
The 24 Volts transformer produces about 35 V. The 20kHz switching frequency is set by the 6-k Ohms resistor and 0.01uF capacitor on pins 6 and 5 , respectively. The TL94 is set for push pull operation by tying pin 13 high. A pair of TIP31 npn transistors are used as switching transistors in a push-pull circuit.

Electronic Circuit is a good site for hobbyist also who would like to try DIY because it shared good circuits. If you have a personalized circuit requirement you may feel free to request it through the comment box or contact me.


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