you can sync the ucc28c4x range of pwm controllers (EG UCC28C43) with a square wave into the RC pin. I think it may be via an inversion, but its still what you want ultimately.
There is also a microchip pwm controller which specifically takes a pwm input from a micro.....i forget its name now, MCP1530 ???.....something like that.
the lt1241 is a spice model for the ucc28c43.....lt1241 is in ltspice....so you can use it there...and put a square wave into the RC pin.
I will send you an ltspice also of a discrete controller ...coming soon
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here it is
This is very helpful.
Concerning the LT1241, I see that in simulation it actually stops when the square wave stops. How does the duty cycle of the clock affects the controller? Does it limit the the duty cycle of the internal oscillator like it does in the MCP1630?
Thanks a lot!
Hi,
Did you check the selction guides at the manufacturer´s internet pages?
Klaus
I'm assuming that duty cycle of the external clock shouldn't matter because only the timing of one edge (rising/falling) matters. Note that these are both current mode controllers. If you need voltage mode control, then this won't work.This is very helpful.
Concerning the LT1241, I see that in simulation it actually stops when the square wave stops. How does the duty cycle of the clock affects the controller? Does it limit the the duty cycle of the internal oscillator like it does in the MCP1630?
Thanks a lot!
This is very helpful.
Concerning the LT1241, I see that in simulation it actually stops when the square wave stops. How does the duty cycle of the clock affects the controller? Does it limit the the duty cycle of the internal oscillator like it does in the MCP1630?
Thanks a lot!
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