TPS23752: Heating of Bridge Rectifier and also output diode and RC snubber circuit

Pallav Patidar

Part Number: TPS23752

We use attached POE circuit in our device.

When our output load is upto 12V, 1.5A then, Bridge rectifiers and output diode and RC snubber ciruit heat upto 80 deg C. Please help to solve this issue.

We use B6S Bridge rectifier, R150 is 10 ohm, 0.5W .

6712.POE.pdf

over 1 year ago

0 Diang Xing over 1 year ago

TI__Mastermind 37111 points

Hi Pallav,

Thanks for reaching out! We will take a look for your question and get back to you by this week.

Best regards,

Diang

0 Pallav Patidar over 1 year ago in reply to Diang Xing

Prodigy 50 points

Hi Diang,

Could you please help me early?

0 Diang Xing over 1 year ago in reply to Pallav Patidar

TI__Mastermind 37111 points

Hi Pallav,

Thanks for your patience.

B6S looks like a 600-V rated PN diode which has very high forward voltage drop. It is recommended to use 100-V rated Schottky diode for the bridge.

For the snubber RC, normally the R and the SW diode needs to have a certain distance between both for better heat dissipation. Besides, if you do not have high overshoot at D77, you can consider increase R150 resistance or reduce C64 capacitance a little to alleviate the power loss on the snubber RC.

Best regards,

Diang

0 Diang Xing over 1 year ago in reply to Diang Xing

TI__Mastermind 37111 points

Hi Pallav,

Since we did not get back from you for a long time. I will close this thread for now. Please reply or open a new thread if you have further questions.

Best regards,

Diang

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TPS23752: Heating of Bridge Rectifier and also output diode and RC snubber circuit