Positive input-negative output charge pump

Posted on Oct 22, 2012

A simple means of generating a low-power voltage supply of opposite polarity from the main supply. Self oscillating driver produces pulses at a repetition frequency of 100 kHz. When the VMOS device is off, capacitor C is charged to the positive supply. When the VMOS transistor switches on, C delivers a negative voltage through the series diode to the output

Positive input-negative output charge pump
Click here to download the full size of the above Circuit.

The zener serves as a dissipative regulator.

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