TPS23750EVM-108, doesn't work well when an Optocoupler was changed.

Shinichi Inoue

Guru 19681 points

Other Parts Discussed in Thread: TPS23750EVM-108

Dear Specialists,

My customer is confirming TPS23750EVM-108.

When an Optocoupler was only changed, the board wasn't work well.

The Optocoupler is from TCMT1107(original) to PS2801C-1.

I couldn't find any differences but CTR.

If CTR has changed, do another pars need to change?

Could you please advise.

I appreciate your great help.

Best regards,

Shinichi

PS2801_r08ds0072ej0400_nepoc.pdf

over 7 years ago

0 Ben Kuo over 7 years ago

TI__Expert 6715 points

Hi Shinichi,

If ou change your your optocoupler, you should change R12 and R24 in TPS23750EVM-108.

below is the equation can help you to find the right components value.

-Ben

If this post answered your question, please click Verify Answer.

0 Ben Kuo over 7 years ago in reply to Ben Kuo

TI__Expert 6715 points

Hi Shinichi,

Update the equation.

-Ben

0 Shinichi Inoue over 7 years ago in reply to Ben Kuo

Guru 19681 points

Dear Ben

Thank you for your prompt reply.

I'm going to confirm and send the the customer.

If he has additional question, I' ll ask again.

By the way, do you have any application note about this matter.

This information is very helpful, but I couldn't any document.

I appreciate your great help.

Best regards,

Shinichi

0 Ben Kuo over 7 years ago in reply to Shinichi Inoue

TI__Expert 6715 points

Hi Shinichi,

If you want to know how to design PoE system.

Please refere to SLVA305C.

-Ben

0 Shinichi Inoue over 7 years ago in reply to Ben Kuo

Guru 19681 points

Dear Ben

Thank you for your reply.

I think SLVA305C is very suitable.

I'm going to send the customer.

I appreciate your great help.

Best regards,
Shinichi

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TPS23750EVM-108, doesn't work well when an Optocoupler was changed.