POSITIVE_INPUT_NEGATIVE_OUTPUT_OHARGE_PUMP

Published:2009/7/8 4:10:00 Author:May | From:SeekIC

A charge pump is a simple means of generating a low-power voltage supply of opposite polarity from the main supply. The 74C14 IC is a self-oscil-lating driver for the MOSFET power switch. It produces a pulse width of 6.5 prs at a repetition frequency of 100 kHz. When the MOSFET device is off, capacitor C is charged to the positive supply.When the power through the MOSFET switches on, C delivers a negative voltage through the series diode to the output. The zener serves as a dissipative regulator. Because the MOSFET switches fast, operation at high frequencies allows the capacitors in the system to be small.



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