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LT8490 has started up but charging will not initiate

Category: Datasheet/Specs
Product Number: LT8490

Input Max = 60V, 10A

Output Max = 14V, 6.6A

test environment:

DC source:VIN  = 24V, Iin = 1A

test  result:




FBIW and FBOW can detect PWM,so I think IC  has been initially activated.

Pin SS can not detect 2.5V.If I switch the line between CSPIN and CSNIN ,Pin SS can detecc 2.5V.

But I've confirmed many times that the line is not wrong.

Here is the datasheet of the IC:

Please ask me questions if you need more info.