Add PWM control for a buck converter

Hello everyone,

I need to make a dimmable buck converter. In practice, my requirement is to flash (<100Hz) a resistive load with variable duty.

The control signal is PWM from a microcontroller and the system is battery powered.

I searched the net but I didn't find a well-defined solution. What I wanted to ask is:

1) There are dc dc converter chips that have the PWM input to make the output flash?

2) How can I modify an existing buck converter scheme to add the PWM input?

3) Some converters have enable input, can I use this for PWM, could I have problems in the long run?

4) I saw that almost all LED drivers have this input, can I modify a driver LED to drive a pure resisitive load?

thanks in advance, FM

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