MCT8316A: Max power rating?

William Snyder

Part Number: MCT8316A

Hello, I would like to use the MCT8316A at approximately 160W. Is this too much power for the part? In the datasheet I see 12-35V operating voltage and an 8A peak output current capability. In my application we will supply the part 26VDC. Thanks.

over 2 years ago

0 Robert Wedan over 2 years ago

TI__Expert 5578 points

Hi William,

Thanks for your question on the Motor Drives E2E Forum.

I will aim to provide an answer on this by the end of next week!

Best,

Robert

+1 Robert Wedan over 2 years ago in reply to Robert Wedan

TI__Expert 5578 points

HI William,

Actually, you may get your answer from this E2E thread: https://e2e.ti.com/support/motor-drivers-group/motor-drivers/f/motor-drivers-forum/1222189/mcf8316a-application-inquiry

Let me know if you have any additional questions about this application.

Best,

Robert

0 William Snyder over 2 years ago in reply to Robert Wedan

Prodigy 45 points

Ah, that is a bummer. Thanks for the help, Robert.

0 William Snyder over 2 years ago in reply to William Snyder

Prodigy 45 points

How come a part with 8A max (6A mean) at 35V is only 80W? And why is such a low continuous power capability not more clearly communicated in the datasheet? I only just noticed it as an aside in a tuning document.

0 Robert Wedan over 2 years ago in reply to William Snyder

TI__Expert 5578 points

Hi William,

I will provide you with an answer tomorrow. I appreciate your patience.

Best,

Robert

+1 Robert Wedan over 2 years ago in reply to Robert Wedan

TI__Expert 5578 points

Hi William,

There is a push and pull between voltage and current in any system. For example, for the same 80W driver there can be a 12V system driving the 3A mean or a 24V system driving 3A of current.

The continuous operating power capability also varies between application, pcb, and thermal management. While we see engineers maxing out this device's integrated FET power delivery capabilities at about 80W of power, it would be improper to spec this in the datasheet and not something every engineer can expect this from our driver based on their system. On the other hand, if you use a heatsink you may be able to go over 80W.

In our BLDC integrated control landing page, we do mention this generic power delivery guideline about about our drivers: https://www.ti.com/motor-drivers/brushless-dc-bldc-drivers/integrated-control-bldc-drivers/overview.html

This may leave you with more questions but hopefully this helps clarify why it is not advertised in the datasheet.

Best,

Robert

0 William Snyder over 2 years ago in reply to Robert Wedan

Prodigy 45 points

So, it is improper to spec the general power rating in the datasheet, but it is proper to spec the general power ratings on the BLDC integrated control landing page. I understand. Thank you Robert.

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MCT8316A: Max power rating?