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Electronics => Projects, Designs, and Technical Stuff => Topic started by: Echo88 on July 24, 2021, 01:16:53 pm

Title: Efficient and low EMI TEC-Driver suggestion?
Post by: Echo88 on July 24, 2021, 01:16:53 pm
Thinking about efficient TEC drivers (max 20W electrical input range or so) that produce low EMI, i came across this LT1534-application-suggestion:
https://www.analog.com/media/en/technical-documentation/data-sheets/1534fa.pdf (https://www.analog.com/media/en/technical-documentation/data-sheets/1534fa.pdf) Page 14

In this case its only able to cool or heat and not both.
Any ideas wether such a simple IC which can do buck or boost can be made to manage both heating and cooling with a smooth transition between both modes, avoiding sudden jumps?

One could of course use the LTC1923, which is made for this task, slew rate and does it all, but is quite costly.
Competitors are ADN8834 (no mention of EMI reduction features) and MAX1968 which id like to avoid when thinking about long term availability.

Never really found SMPS-ICs (Buck, Boost, Push Pull for example) that claim slew rate limiting apart from the ones Linear (LT1533,1534,1738 for example). Are there any from other vendors or is it a patented technique?

Any other suggested methods, suitable ICs or even OSHW-designs that would do it?

Thanks.
Title: Re: Efficient and low EMI TEC-Driver suggestion?
Post by: MarkL on July 24, 2021, 03:18:33 pm
Take a look at TI's line of PWM TEC drivers:

   DRV591
   DRV592
   DRV593
   DRV594
   DRV595

They are all bridges with built-in, protected drivers, and they can heat or cool with no transition discontinuities (the 593/594 is a half-bridge with automatic crossover control).  The parts cover a couple of different output voltages and current, and digital (PWM) or analog control input.

They're efficient, but EMI mitigation is something you're going to have to design in.  EMI design is discussed in the datasheets.