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TPS65150: start up issue when doing power cycle test

Part Number: TPS65150

Dears

we have followed the schematic of TPS65150 datasheet, and find there have a start up issue, when the power cycle less than 1.2s, in this condition, the VGH is not discharged to zero when input re powered. and find an issue of that, the VGL is not set to target and VGH is stuck to very low, DRVP no pulse output.

if we make the power up time longer than 1.5s, the TPS65150 will power up normally, so we would like to know if our device have some power cycle time requirement? and also if our device have some protection inside to stop the DRVP, we have disabled the fault function in this case.

Thanks.

Jun Shen