UCC21710-Q1: UCC21710 Gate Driver RDY Parallel Connection

Kartavya Agarwal

Part Number: UCC21710-Q1
Other Parts Discussed in Thread: UCC21710

Tool/software:

Hi,

I am using two UCC21710 ICs to drive two different SiC MOSFETs. The datasheet indicates that the RDY pins on both the UCC21710 chips can be paralleled due to the open drain configuration.

As a result, I want to hard parallel pin 12 on both UCC21710 ICs in my implementation with a single,external pull-up resistor placed on the unified, parallel signal. Please see a very rough sketch of this below:

Is there any other design consideration I must keep in mind to ensure proper operation of both gate driver ICs when doing so?

Any insights you could share would be greatly appreciated.

1 month ago

+1 Sasikala Thangam 1 month ago

TI__Expert 7865 points

Hi Kartavya,

Yes both Rdy pins can be connected together and connected to single resistor as shown (in terms of electrical functionality). The resistor basically limits the current through RDY pin.

However if one driver has some bias issue and is pulling RDY low- if we are shorting both RDY pins together, then it may not be easy to identify which one causes RDY low.

Hope it answers your question.

Thanks

Sasi

0 Kartavya Agarwal 1 month ago in reply to Sasikala Thangam

Prodigy 70 points

Yes, that is the tradeoff I was expecting. Thank you very much for the clarification.

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UCC21710-Q1: UCC21710 Gate Driver RDY Parallel Connection