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UCC28C43: What will make Pin OUT broken

Liang Paker

Intellectual 280 points

Part Number: UCC28C43

1. OUT is broken when turn off . OUT short to GND with impedence arroud 5ohm .

2. Sometimes, VCC is broken when turn on, VCC short to GND.

How to figure out this issue?

Attached is schematic of PSU

over 2 years ago

0 JCHK over 2 years ago

TI__Guru 50040 points

Hi Liang,

Are you sure the absolute maximum rating of the VCC pin is not getting violated? The absolute maximum voltage on the VCC pin is 20V. What is the voltage rating for D6? The new UCC28C53 has a 30V maximum VCC rating it might be more robust if this is the issue. This is a pin-to-pin direct drop-in replacement.

I hope this gives you some ideas.

0 Liang Paker over 2 years ago in reply to JCHK

Intellectual 280 points

Hi JC，

D6 is 18V。

For UCC28C43，sometimes, only OUT is broken when turn on/off . What will make OUT pin breaking down, and how to improve?

0 Ray DiCecco over 2 years ago in reply to Liang Paker

TI__Genius 11350 points

Hi Liang. a product expert will get back to you on this shortly.

0 Hong Huang over 2 years ago in reply to Ray DiCecco

TI__Guru 73155 points

Hi,

D5 in your schematics seems not typical. Does this design have high negative spikes, or why did you add D5 in this design?

Can you capture the OUT pin waveform when turn off?

0 Hong Huang over 2 years ago in reply to Hong Huang

TI__Guru 73155 points

Hi,

As no response for a long time, I will close the thread. You can open a new thread when you find you still need support.