Ramp generator


Posted on Jul 5, 2012

The linear charging ramp is most useful where linear control of voltage is required. Some possible applications are a long period voltage controlled timer, a voltage to pulse width converter, or a linear pulse width modulator. Ql is the current source transistor, supplying constant current to the timing capacitor Ct. When the timer is triggered, the clamp on Ct is removed and Ct charges linearly toward Vcc by virtue of the constant current supplied by Ql. The threshold at pin 6 is ¥3 Vcc; here, it is termed Vc.


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

When the voltage across Ct reaches Vc volts, the timing cycle ends. The timing expression for output pulse with is:




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Michael J. Rainey: July 2011
Car audio amplifier 40w
1.5V to 5V/12V DC/DC Converter with LT1073
Car Door Keypad Using Lin
Single Span HF Test Oscillator
Power LED Driver
When using the lamp base circuit delay circuit 2
A volt DC power supply circuit



Top