TPS54335A: PH pin short to GND issue

JeffYC Yang

Part Number: TPS54335A

Hi,

My customer encountered TPS54335A PH pin damaged issue, below is customer's design.

I have been create another Vin=24V, Vout=5V/3A design from webench, but seems some COMP value/ switching frequency setting is different.

Different COMP value it may cause some operation abnormal than cause PH pin damage?

Customer's schematic:

below is based on customer's demand using webench tool to created.

webench_design_TPS54335A.pdf

over 7 years ago

0 JeffYC Yang over 7 years ago

Expert 1290 points

Hi,

Or you have any idea for TPS54335A PH pin damaged issue?

Thanks!
Jeff

0 Ryan Hu (BSR-MV) over 7 years ago in reply to JeffYC Yang

TI__Expert 4035 points

Hi Jeff,

The schematic is ok. Before the PH damage issue, what operating applied to the device? And what's the failure rate?

Ryan

0 JeffYC Yang over 7 years ago in reply to Ryan Hu (BSR-MV)

Expert 1290 points

Hi Ryan,

What do you mean "operating applied to the device"? Failure rate now is un-know, because it RMA return.

Thanks!
Jeff

0 Ryan Hu (BSR-MV) over 7 years ago in reply to JeffYC Yang

TI__Expert 4035 points

Hi Jeff,

I mean this issue hapenned under what's condition, any operating to the device before this hapenned. like Power on/off, load transient or short test, etc..

Ryan

0 JeffYC Yang over 7 years ago in reply to Ryan Hu (BSR-MV)

Expert 1290 points

Hi Ryan,

Due to it RMA return,
So customer got fail MB just know TPS54335A PH pin is short to GND, but they don'r know is what kind of condition....

Thanks!
Jeff

0 JeffYC Yang over 7 years ago in reply to JeffYC Yang

Expert 1290 points

Hi Ryan,

Customer noted loading side have an inrush current sometimes up to 4.89A as below waveform, they suspect many times OCP maybe cause it damaged.

Thanks!

Jeff

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TPS54335A: PH pin short to GND issue