In my design I use SHDN with NMNOS transistor as describe:
When Q4-1 change to on/off the 24V_OUT1 rail is always 24V
SHDN = 0V when Q4-1 is 3.3V
SHDN = 2V when Q4-1 is 0V
KCC's Quizzes AQQ304 - A pure logic
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2. Quiz AQQ304 about finding a pure logic puzzle
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LTC4359
Recommended for New Designs
The LTC4359 is a positive high voltage ideal diode controller that drives an external N-channel MOSFET to replace a Schottky diode. It controls the forward...
Datasheet
LTC4359 on Analog.com
In my design I use SHDN with NMNOS transistor as describe:
When Q4-1 change to on/off the 24V_OUT1 rail is always 24V
SHDN = 0V when Q4-1 is 3.3V
SHDN = 2V when Q4-1 is 0V
Q2 has probably failed due to exceeding the safe operating area (SOA).
Verify by measuring the resistance from gate to drain to source when the circuit is OFF.
Q2 must be selected to have enough SOA to survive startup.
Also, I recommend not straying too far from fig 6 in the datasheet.
The 1kΩ on VSS is necessary.
Why Q2 SOA is not enough to survive startup ?
1K ohm on VSS is not for reverse voltage protection ?