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TPS54140: tps54140 startup issue

Part Number: TPS54140

Dear team,

TPS54140 has startup issue. We are not sure if it was caused by the input port. The 12V input is connected in series with 6 Ohm resistor with 100m network cable. 2 wires as VIN+, 2 wires as VIN-, 2 wires as VIN+.

The schematic:

The waveform: VIN-yellow; VOUT-blue.

Thanks.

Best regards,

Sammi