LMH6526: PWM input TEC driver

Hello Toshiro,

The LMH6526 won't work for this application and can only supply a maximum output current of 600mA. Will move thread to the appropriate product line. 

Best,

Hasan Babiker

Hi Toshiro-san,

If you are looking for integrated TEC driver solution, please check out DRV591, DRV592, DRV593, DRV594 or DRV595 drivers.  These products are supported by other team, and I have to transfer you to the team once you made a decision (or you can do submit the query yourself).  

If you are looking for discrete TEC driver solution, we may be able to help you here. Please specify your design requirements. 

From your application information you provided, I am going to summarize it below. 

1. H-bridge TEC driving architecture. 

2. Heating or cooling requires 3Adc minimum.

3. TEC voltage driving voltage from +/- 1.8Vdc to +/-3Vdc or +/-1.2Vdc to +/-3.0Vdc (TBD)

4. Controller heating or cooling with PWM (0-3.3V) input signals up to 200Hz.  (one pair of H bridge is responsible to heating, the remaining pair is responsible to cooling). My guess is that one PWM channel will go through LPF and used to control a heating setpoint, and other PWM Channel will go through LPF and used to control a cooling setpoint. 

5. Please list other design requirements, such as how to control TEC temperature, TEC module cooling (single TEC stage?), temperature operating environment, control accuracy, TEC heating/cooling temperature range, operating humidity, heating or cooling rate etc..

6. cost (TBD)

Best,

Raymond

Hi Toshiro-san,

Sine you have not provided us with detailed design requirements, the design concept below is what the TEC controller may look like in discrete format. The components in the schematic are not finalized, this is just a TEC design concept. 

If you have other questions, please let us know.

Best,

Raymond

Raymond-san,

Thank you very much for your suggestion. I have checked DRV593, DRV594, DRV595 however, neither product seems not meet with our customer request. The customer needs TEC driver in following control scheme and spec.

Applying +/-1.8V across Peltier device.

Max drive current is at least 2.5A, the higher the better.

Control by 0-3.3V 200Hz PWM signal.

small size solution is the best.

After studying your feedback, discrete solution looks the closest that our customer looks for, in case Vtec voltage sets 1.8V.

I will show this schematic and ask him if this is what he wants to do.

best regards,

Hi Toshiro-san,

Per your small footprint requirements, I made some component changes and see if it will meet the customer's requirements. 

I selected H-Bridge in SO-8 package, and it should make the circuit fairly small. There are only two ICs, OPA2192 and DMHC3025LSD + feedback and compensation components. This is still a concept design, but it is getting closer to meet your requirements. 

https://www.diodes.com/assets/Datasheets/DMHC3025LSD.pdf

If you have additional questions, please let us know. 

Best,

Raymond