Hi team,
This is FAE Michael. I have 3 LM46000 EVM. But they all can't power up... I only connect the input Vin and Gnd to the power supply 12V, without any load. But the output is charging slowerly from 0.3---1.2V. Because the MOSFET is not on, the charging output make sense. But what I don't know is why it can't operate normally.
Internal VCC is 3.3V. It is right.
Actually when I measure the SW waveform, there is one pulse at power up moment about VIN=4V. Then the device can't switch.
Really don't know why because it is EVM. I think it can be directly used without any change. Do you have this issue before? I didn't change any component on the board... I use multimeter to measure VIN, the VIN connection is good enough and it is 12V normally.
Regards
Michael