The circuit below is a power switch controlled by a push button. Basically, the switch (Q1) is controlled by a On/Off IC controller.
During testing on the real circuit, a DC Electronic Load is connected on Vout (as load) and a DC power supply is connected to the input (Vin).
When the IC (U1) turn off the load, the P channel transistor is damaged in the following conditions:
- DC electronic load (connected at Vout): 2A
- DC Power Supply (connected at Vin): 24V (max 4A)
Edit: after adding a 40V 15A Schottky diode (SK154-TP) parallel to the load, the following test were performed:
- 1A load with 24V input
- 2A load with 24V input
- 3A load with 24V input
Below the voltage on load during the turn on/off of the transistor.
Below the setup:
Performing the same testing (3 cases) without C1 and R2 = 0 the results on Vout