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Voltage doubler Capacitance values

I have an astable multivibrator that produces 5v square wave input to the push-pull and the voltage doubler part of the circuit. Now somehow the simulation works at 0.1uF capacitors for the voltage doubler, but I do not understand how to select the values for the capacitor when I have an input at 32.3kHz.my max current load will be 60mA. I am essentially building this to power Opampms in my circuit....OPA4140

I have the screenshot in a zip file too if you cant see via the link

0 jmakwana over 1 year ago

Screenshot (1496).zip
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0 retiredEE over 1 year ago

This circuit will not double the voltage but comes close if the load current is very low. Fast switching Shottky diodes are a must to keep their drops low and support the high surge currents through them. The input push-pull stage current drive and response time are also important. The following two equations can get you started estimating C3 and C4.

Vout(Avg) = 10 - Vd1 - Vd2 - 60mA / (C3 x 32.3kHz)

Vout(P-P ripple) = 60mA / (C4 x 32.3kHz)
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