Positive-input-negative-output-charge-pump


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.


Positive-input-negative-output-charge-pump
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

Guarded input picoammeter circuit
Hi-Fi Tone Control
Vehicle Interior Lighting With Switch-Off Delay
Capacitive SensorCircuit
SN754410 Dual Motor Control Circuit
800 W SOFT START LIGHT DIMMER
Home-Built Pulsed Multiple Gas (PMG) Laser



Top