CSD97395Q4M: Any recommended multiphase controller for this device?

Claude Chevalier

Part Number: CSD97395Q4M
Other Parts Discussed in Thread: CSD, TPS40425

Hi,

I'm planning on using a pair of CSD97395 powerstages to drive a thermo-electric cooler (TEC / Peltier device). Basically, the CSDs would each drive one side of the TEC, meaning the TEC would be driven differentially.

The basic CSD Vout would range from 0V to 12V. The TEC neutral state would be with both CSD driving 6V. Maximum heat would be 12V / 0V while maximum cool, 0V / 12V.

In order for this to work, one of the CSD needs to SINK the current sourced by the other.

Question 1: Is the CSD97395 capable of both sourcing and sinking the 25A max continuous current?

Question 2: Can you recommend a multiphase controller suitable for that device (as shown in datasheet figure 3)? One with both voltage and current sense capabilities?

Thanks,

over 1 year ago

0 Dhanyasree Prem Sankar over 1 year ago

TI__Expert 4260 points

Hey Claude,

Our team will get back to you on this.

Best Regards,

Dhanya Prem

0 Claude Chevalier over 1 year ago in reply to Dhanyasree Prem Sankar

Prodigy 10 points

Hello,
Any news on this?

Thanks!

0 yihe over 1 year ago in reply to Claude Chevalier

TI__Guru 66120 points

Abhishek is OOO and Mahmoud will help you here.

Regards

Yihe

0 Mahmoud Harmouch over 1 year ago in reply to yihe

TI__Mastermind 28260 points

Hello,

the max duty cycle is 85%. The max voltage is 12V*0.85 = 10.5V.

Is it regulated or open loop?

Regards

0 Claude Chevalier over 1 year ago in reply to Mahmoud Harmouch

Prodigy 10 points

Hello Mahmoud,

OK, 10.5V max.

What about current? Is the CSD capable of sinking as much current as it can source? Because in a TEC controller, all the current sourced from one side must be sinked by the other side. Let me know.

Claude

0 Mahmoud Harmouch over 1 year ago in reply to Claude Chevalier

TI__Mastermind 28260 points

Hello,

is the full bridge driving an inductor?

Regards

0 Claude Chevalier over 1 year ago in reply to Mahmoud Harmouch

Prodigy 10 points

Yes. Most probably an inductor to GND on each side of the TEC, such that the TEC sees near DC.

0 Mahmoud Harmouch over 1 year ago in reply to Claude Chevalier

TI__Mastermind 28260 points

I believe yes the current capability is sinking and sourcing. You may use TPS40425 controller. It has 2 PWMs 180 phase shift.

We do not have a history of similar application using TI power stages and controllers. The PS and controllers are typically used for DC/DC buck converter.

Regards,

0 Claude Chevalier over 1 year ago in reply to Mahmoud Harmouch

Prodigy 10 points

Thank you.

Indeed, DC-DC buck on each side of the TEC is what I want to do. The reason I'm investigating the CSD is that I can't find ready-to-use DC-DC with matching source / sink capability. The DC-DC I investigated can ALL source much more than they can sink.

The CSD along with the controller will allow me to implement both voltage and current limits to the TEC. Useful!

Thanks for helping.

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CSD97395Q4M: Any recommended multiphase controller for this device?