Why can't my ADP1046 output PWM wave?

Hello,When I supply power to ADP1046A, none of the OUTA\OUTB\OUTC\OUTD pins output PWM wave.After I rewrite most of the registers according to the official reference document "UG-768", after inputting 1V voltage to VS1/VS3/CS1/CS2, the PWM wave cannot be output. Please help answer,thanks.