TPS1641: failed to reset in Surge test

Rohit6230

Part Number: TPS1641

Dear,

We use the TPS16410DRCR Auto-retry eFuse IC for protection. However, during our surge test with a +/-1KV signal every 1-minute interval, following the IEC 61000-4-5 standard(The 1.2/50 μs waveform represents the rise time (1.2 microseconds) and the time to half-value (50 microseconds) of the surge voltage. ), the TPS16410DRCR resets for 2 to 3 cycles, which is acceptable. However, after the 4th cycle, it enters a shutdown state and cannot be powered up until the 24-volt supply is restored. Please find the details of the schematic in the attachment and let me know.

Sheet -1-EFUSE SECTION ONLY -NOT USE.pdf

5 months ago

0 Arush Gupta 5 months ago

TI__Expert 8530 points

Rohit,

We will get back to you by EOD.

Best Regards,
Arush

0 Arush Gupta 5 months ago

TI__Expert 8530 points

Hi Rohit,

During the Surge protection test, was current going to high level like more than 6.7A? Do you have any waveforms?

Best Regards,
Arush

0 Rohit6230 5 months ago in reply to Arush Gupta

Intellectual 715 points

Thanks ArushJi, for reply. Please find waveform image its more than 6.7A.

0 Arush Gupta 5 months ago in reply to Rohit6230

TI__Expert 8530 points

Hello Rohit,

The device is shutting down due to short circuit detection which uses threshold of 6.7A. Is it possible for you to test this with higher PC1 value like 10uF. Also in the layout, can you check if the capacitor is very far away from the device.

Please reply back if you perform the experiment with changed PC1 value.

Best Regards,
Arush

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TPS1641: failed to reset in Surge test