TPS1641: Short circuit of VIN, VOUT, GND

Moon Wang

Part Number: TPS1641

Tool/software:

Hi Team,

My customer found the Vin, Vout and GND are shorted. When they took away the TPS1641, the circuit was normal. Below is the schematic. Could you please check if it has some problems?

BR,

Moon

5 months ago

0 Rakesh 5 months ago

TI__Guru** 103766 points

Hi Moon

did they performed any tests ? or is it time zero fail ?

BR,

Rakesh

0 Moon Wang 5 months ago in reply to Rakesh

TI__Intellectual 860 points

hi Rakesh,

They gave 24V power to testing board with hot plugging. Then a little spark appeared in F1. Then they took away the chip from board and tested the resistors of pins:

IN to GND: 1Ohm

Out to GND: 1 Ohm

The resistors to GND of other pins are more than 10M Ohm.

BR,

Moon

0 Rakesh 5 months ago in reply to Moon Wang

TI__Guru** 103766 points

Hi Moon,

Looks like Vin is going above spec during hot plug test. Can you capture Vin during hot plug test and check

Rakesh

0 Moon Wang 5 months ago in reply to Rakesh

TI__Intellectual 860 points

Hi Rakesh,

For their application with hot plugging, is the TPS1641 suitable? They want the function of 50mA current limitation, what's the recommends else for the requirement?

BR,

Moon

0 Rakesh 5 months ago in reply to Moon Wang

TI__Guru** 103766 points

Hi Moon,

TPS1641 is suitable for hot-plug applications.

Use 0.1uF at input and TVS diode SMBJ28A in parallel to 0.1uF. These will help to absorb transient voltages and protects TPS1641

BR,

Rakesh

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TPS1641: Short circuit of VIN, VOUT, GND