Timing resistor and capacitor - Electronic Circuits Projects Diagrams Free

Gfsrepairs · 16th April 2008, 05:53 PM

I'm working on the controls for a buck circuit. I'm trying to understand better what the controls are doing. I understand the basics of PWM ICs. What is the purpose of the timing resistor and timing capacitor or Rt and Ct. Anyhelp would be appreciated.

ericgibbs · 16th April 2008, 06:46 PM

Quote:

Originally Posted by Gfsrepairs

I'm working on the controls for a buck circuit. I'm trying to understand better what the controls are doing. I understand the basics of PWM ICs. What is the purpose of the timing resistor and timing capacitor or Rt and Ct. Anyhelp would be appreciated.

hi,
Do you have a drawing.?

crutschow · 16th April 2008, 06:50 PM

These generally control the PWM nominal frequency. The data sheet will tell you the frequency for a given R and C.

Blueteeth · 16th April 2008, 06:50 PM

Without any form of diagram/part number we're in the dark. But perhaps they timing components are used to set the frequency of the switching regulator? As in the period of the PWM?

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16th April 2008, 05:53 PM	(permalink)
Gfsrepairs	Timing resistor and capacitor I'm working on the controls for a buck circuit. I'm trying to understand better what the controls are doing. I understand the basics of PWM ICs. What is the purpose of the timing resistor and timing capacitor or Rt and Ct. Anyhelp would be appreciated.

16th April 2008, 06:50 PM	(permalink)
crutschow	These generally control the PWM nominal frequency. The data sheet will tell you the frequency for a given R and C.

16th April 2008, 06:50 PM	(permalink)
Blueteeth	Without any form of diagram/part number we're in the dark. But perhaps they timing components are used to set the frequency of the switching regulator? As in the period of the PWM? __________________ Inconsistency is the key to flexibility!