Electronics > Projects, Designs, and Technical Stuff
Desiging with DrMOS
ali_asadzadeh:
Hi,
In this thread I have asked people about solutions to powering a kintex FPGA
https://www.eevblog.com/forum/fpga/xc7k325t-low-cost-power-management/
And blueskull has suggestued to Use DrMOS modules as a good way of doing it. I never heard of DrMOS before, But after searching them, Actually I kinda liked them. I have found some parts for driving them like RT2702.
I want to know your ideas and experiences with them? Have you done project with these beauties? what did you use to drive them?
This Idea came to my mind to use a Paduk MCU like PFS173 with internal ADC to build one(some of the cheapest solutions), is it doable?
ali_asadzadeh:
--- Quote ---To implement peak mode control, regardless voltage or current, you need cycle to cycle sensing and ridiculously fast comparators and interrupt system.
I recommend you to take a look at SiLego's GreenPAK chips, and build a pure-analog controller IC (even with DVFS since the comparator hysteresis can be tweaked over I2C for some parts).
The learning curve will be extraordinarily steep as you will be designing literally an SMPS controller chip, which is what those grey beard gurus at TI/LT do. But once you make it, you get wonderful <$0.5 SMPS chip of your own that can be tweaked in any possible ways.
--- End quote ---
Thanks for the tips, Any appnote, book or part number to start with? what's your favorite DrMOS and GreenPAK chip part number is?
ali_asadzadeh:
--- Quote ---I work exclusively with GaN devices now, so I no longer use a DrMOS device. The SiLego part I'm working on is SLG46120. It has the fastest comparator, if you need to do peak mode control. Be advised that its comparator is still rather slow, so you might be good to 100kHz.
It can be accelerated, but then the trick would be not trivial.
--- End quote ---
Thanks, what about programming these devices, they seem to be OTP! How many you will through a way to reach the right design? do they have a open source programmer? also what's good about GaN device? what's your favorite one there? ^-^
Doing the Buck with old analog stuff and DrMOS like TL494, is it doable and good?
ali_asadzadeh:
So for example an old part Like MC34063 can be used?
for Implementing it with SiLego, basically you would implement the block diagrams or internals of 34063?
ali_asadzadeh:
The padauk has an Internal Comparator too, so maybe with this It can control the DrMOS easily.(it's high speed regarding the price of MCU)
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