TPS23753A: Question of PMP9175

na na78

Part Number: TPS23753A
Other Parts Discussed in Thread: PMP9175, CSD17527Q5A, CSD17551Q3A, CSD17579Q5A

Our customer is considering PMP9175 for their design and the following question is coming out.

1.
There are two FET like following figure and Q5 is DNP.

What is the purpose to be reserved Q5 as DNP in the schematic?

2.
CSD17527Q5A (Q3) is used in TPS23753AEVM-235.
CSD17551Q3A (Q7) is used in PMP9175 design.
CSD17551Q3A seems to have smaller rated current and power dissipation than CSD17527Q5A.
Is there any reason why CSD17551Q3A is selected in PMP9175 instead of CSD17527Q5A?

Do you have answer?

BestRegards

over 6 years ago

0 Darwin Fernandez over 6 years ago

TI__Mastermind 40680 points

Hi na na 78,

1. The FET is there just so we could evaluate a different package FET. Q7 FET is what we tested with. Q5 can be removed.

2. Both were tested and are okay to use in a design. I find however, that they are both NRND. You can either of the alternative FETs that is recommend on the product pages. CSD17579Q5A would probably give better efficiency.

0 Thomas Lewis over 6 years ago in reply to Darwin Fernandez

TI__Expert 5615 points

na na 78,

I wanted to check in with this thread as we have heard back from you in some time. Please let us know if there is anything else we can do to assist...otherwise, we are going to assume this thread is resolved.

Thank you for your interest in PoE products from TI,

0 na na78 over 6 years ago in reply to Thomas Lewis

Guru 16770 points

Hi

I'm sorry, I had not been replied.

I appreciate your helpful information.

BestRegards

0 Thomas Lewis over 6 years ago in reply to na na78

TI__Expert 5615 points

No need to apologize! We are happy to hear that we have been of assistance.

I notice you are a frequent poster in our forum - keep the questions coming!

Best Regards,

Because of the holidays, TI E2E™ design support forum responses will be delayed from Dec. 25 through Jan. 2. Thank you for your patience.

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TPS23753A: Question of PMP9175