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Positive input-negative output charge pump

2017-08-22 16:02  
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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

The zener serves as a dissipative regulator.

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