Posted on Jan 20, 2013

A charge pump is a simple means of generating a low-power voltage supply of opposite polarity from the main supply. The 74Cl4 IC is a self-oscillating driver for the MOSFET power switch. It produces a pulse width of 6.5 p,s 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.

Click here to download the full size of the above Circuit.

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.

Leave Comment

characters left:

New Circuits



Popular Circuits

Voltage Doublers
Serial communication between AVR-006 & computer
audio tone control 2 transistor circuit
alarm door bell circuit using ic um 66 part 1
Comparator Based Crystal Oscillator
designing audio circuit tape delay
Sequence timer diagram composed by NE555
555 electrical equipment overload and a phase circuit protection device