Rather than power the chip from Vbus, as shown in the picture below, in my design the chip is powered from Vbat.
On the test condition , Vbat is set to 41V,10mA . The Vgs of M2 is measured to be 6.2V, other MOSs is low.
When I tried to measure the voltage of MODE pin with a multimeter, some noise like spark can be heared.
Then I measured the voltage of LDO33 pin, it's 0.5V, which is supposed to be 3.3V. I think the LT8708 is damaged.
One question is, should I adjust the terminal from which the chip is powered ?
Another question is, the doides DB1 and DB2 I used is Schotky Doides, however Si Doides is recommend in the datasheet.Could this influnce the Vgs of M1 and M4 ?
