Everyone help me look at this circuit
If the VGS of AO3415 is ±8V, will this circuit burn?
The originally intended function is to enable 12Vout output when enabled, and no output when enabled.
The previous design is used, and I care too much. Today, I found an AO3415 burned under the condition that the output is not connected to the load. Check the manual to see that VGS is ±8V. Is this the reason?
How to modify it?
Alexandrea Posté sur July 1, 2020
It should be the problem of Vgs overrun. If you cannot replace Q1 with another PMOS with a higher Vgs range, you must change the board. Add a series resistor at the D pole of Q2 and divide the voltage with R1 to control the G pole of Q1, so that Vgs is not -12V. Too.
Kezia Posté sur July 1, 2020
You may not change the board for the time being, just change the device and add it next time you change the board.
Luiza Posté sur July 1, 2020
The voltage of VGS has exceeded the specification requirements. Anything that exceeds the specifications requires risks. Suggest:
1. Add resistance to divide voltage to within 8V.
2. Change the MOS tube with larger VGS voltage.
Jacek Posté sur July 1, 2020
The manual says that VGS is about -4.5V as a normal value, don't exceed it.
