Other Parts Discussed in Thread: LM5143
Could you advise how EN1/2 is only 1.2V even when VIN is applied with 12V in LM5143EVM?
I measure VIN and PGND, then see 12V. I measure EN1 and PGND, then see 1.2V. EVM used to work well but out of nowhere its output doesn't come out after several pulse during the startup, and I notice EN pin voltage.There's only 100kohm pull-up resistor on EN pin and I do not see any additional circuitry in the internal block diagram. VCC and VDDA is only ~0.8V. Could you advise?
<LM5143 internal block diagram in datasheet>