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Controlling step down converter with PIC

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carmusic

New Member
Hi i am building a small dc/dc converter usinf st1s10 step down module (standard synchrounous step down converter) all of those conveter use a feedback pin with two resistor for setting out the voltage . feedback voltage is always about 800mv. My question is i would like controlling the output voltage of the converter using a PIC (converting pwm to voltage reference). how can i connect my voltage reference to the converter.
i was doing before with a potentiometer before but i cant send a voltage directly at Feedback pin. i would need a virtual potentiometer!.
could i use a transistor to simulate a varaible resistor? Could i replace Rin with a transistor or ic that simulate a resistor to change the gain of amplificator.
Thanx
 

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Ubergeek63

Well-Known Member
leave the gain fixed and add a divider after the gain stage, if you must... better still get an LED driver and use the PWM input to control the LED intensity
 

carmusic

New Member
O sorry I will not use this for led driving, schematics is just an example of adjusting current with fixed resistor, i must adjust it with a PIC so does it exist a chip that simulates a variable resistor
 
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