[PIC] TL494 and Microcontroller

[nadsthereader]

Hello guys... Is it possible to control the duty cycle of the PWM signal produced by TL494 by microcontroller?

 

[smijesh]

TL494 do not have any inter phase option with external micro controller. It is self sufficient PWM power control circuit.

 

[GeorgesWelding]

If you can generate a 0-5V analog output with your micro then yes you can. You can feed this into the Dead-Time Comparator pin to control the DC directly, or you can feed it into one of the error amps along with a feedback signal from your power supply and control it that way. If you can't generate a 0-5V analog output you can also control the TL494 with a PWM signal fed through an RC filter to create a 0-5V signal.

 

[kabeer02]

yes you can....as Georges welding said its very possible and you can also use the tl494 alone depending on how you design your circuit..

 

[dr pepper]

The tl494 is a veritable chip.
If you need switchable output voltages then you could use transistors to switch in and out resistors to ground on the feedback loop, or if your using the chip as a pwm generator switch resistors to ground from pin 3.
Or if you want to be clever you might be able to use the vref block within a pic instead of the vref in the tl494.