Electronics > Projects, Designs, and Technical Stuff

Looking for Buck regulator IC digital controlled Vout

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Sowlaki:
Hello fellow EEvbloggers,

I am building a USB PD 2.0 compliant PSU (Source) and need a buck regulator that can output voltages in the range 20V - 5V with a current of 5A at full load. However I am unsure how to control the output of the regulator since many of these buck ICs tend to be feedback controlled with a voltage divider network pulled by the Voutput of the regulator. Do you know any ICs with PWM control or I2C for example. The design will include a STM32 Cortex M0 for USB PD transactions.

Thanks for any replys.

dazz1:
Hi
If you cant find a programmable device, you could put a DAC in the feedback loop.  Instead of using a Vref voltage, you use the feedback output of the converter.  The DAC then acts like a digital controlled potentiometer.    You could also try digitally controlled potentiometer devices, often used in audio equipment.

Dazz

ledtester:
Here's a Maxim app note describing how to inject current into the controller's feedback input using a DAC:

https://www.maximintegrated.com/en/app-notes/index.mvp/id/5058

voltsandjolts:
PWM adjustment of Vout feedback signal:

https://www.electroschematics.com/13953/mp2307-digital-power-supply-module-teardown-analysis-part-2-2/

ledtester:
An interesting project which modifies cheap LM2596 modules into programmable power supplies:

https://github.com/TG9541/stm8ef/wiki/Board-CN2596

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