Other Parts Discussed in Thread: TEST2
Dear all.
LM2642 of 3/1000 does not start.
Schematic is;
1ch:VIN=13V |
2ch:VOUT=3.3V |
3ch:ONSS |
4ch:VU_DELAY |
Device number No.1 : Can't output ch2(5V).
No.2 : Can't output ch1(3.3V).
No.3 : Can't output ch2(5V).
I pointed out ONSS1 and ONSS2 is connect, but the symptom did not change even if I separated.
TEST1:
They connect UV_DELAY to GND.
No.1 and No.3 are not work.
No.2 is work.
TEST2:
They change FET(new) of No.1 and No.3.
No.1 is not work.
No.3 is work.
TEST3:
They said that they became the same waveform when they remove Boot Strap Diode of the device which worked.
So they removed No. 3 Boot Strap Diode. No.3 is not work.
And they put diode back again. and change new FET.
However, No.3 did not work.
Are there a register or Flip Flop that are not reset even if turned off?
Please teach me what I should confirm about this problem.
Best Regards,
PAN-M