[SOLVED] using 8051 as SEPIC DC-DC Converter

[tonyctsiu]

Dear All,

If I have a voltage input from a generated powered by wind mill. The power generated ranges from 0-40V
I want to use this power to simply power a 3V Cree LED.
It seems to me that I can create a SEPIC DC-DC circuit and a current mode DC-DC converter IC to provide constant current to the LED.
Given I have an 8051 MCU with fast enough ADC (with voltage reference) and adjustable PWM capability.
I use this 8051 to switch an external MOS.

Is it possible to create a 8051 based Dc-DC circuit?
Will this method yield lower efficiency?
Does the ADC need have high enough sampling rate in order to make it work?

Thank you and best regards,

Tony Chun Tung Siu

 

[crutschow]

You could, but it's a lot more work then just using an IC dedicated to doing a SEPIC DC-DC converter.