PoE input capacity over the definition of specification when using TPS23753

TT_Chin

Expert 2025 points

Other Parts Discussed in Thread: TPS23753

Hi Darwin,

We test our PoE PD device and foud the Cin over the specification define.(0.05uF~0.12uF).

Our Cin is 0.122uF Attachment is our test result and schematic.

Do you have any suggestion?

Thanks!

Jefer

TPS23753_PoE_test.pdf

TPS23753_PoE.pdf

over 9 years ago

0 Darwin Fernandez over 9 years ago

TI__Mastermind 41760 points

Hi TT_Jefer,

It looks like the bob smith terminations in the magjack might be causing slightly higher capacitance measurement. I recommend slightly reducing C255.

Regards,
Darwin

0 TT_Chin over 9 years ago in reply to Darwin Fernandez

Expert 2025 points

Hi Darwin,
Okay,I will use 2 pcs of 0.047uF.
What do you think?
Thanks!

0 Darwin Fernandez over 9 years ago in reply to TT_Chin

TI__Mastermind 41760 points

Hi TT_Jefer,

Yes, 2x0.047uF is okay.

0 TT_Chin over 9 years ago in reply to Darwin Fernandez

Expert 2025 points

Hi Darwin,
Okay, thanks!

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PoE input capacity over the definition of specification when using TPS23753