Hi,
I am using a cj3400 30v 5A mosfet.
I build a 555 pwm controller to control its output. 555 gives a 5 v output and is connect to mosfet get with a 1k and 1k voltage divider. While it's drain is connected to loads and load is connected to a 24v supply.
When I used the circuit it worked perfectly.
But later I mistakenly turned on the 24V supply while the 555's supply was disconnected. And the mosfet somehow turned on and now the source and drain only have resistance of 40 ohm.
I didn't notice if until the load started burning and turned off the supply.
The load is a 18 ohm heating element.
What went wrong with the Mosfet and how can I prevent it?
Thankyou
I am using a cj3400 30v 5A mosfet.
I build a 555 pwm controller to control its output. 555 gives a 5 v output and is connect to mosfet get with a 1k and 1k voltage divider. While it's drain is connected to loads and load is connected to a 24v supply.
When I used the circuit it worked perfectly.
But later I mistakenly turned on the 24V supply while the 555's supply was disconnected. And the mosfet somehow turned on and now the source and drain only have resistance of 40 ohm.
I didn't notice if until the load started burning and turned off the supply.
The load is a 18 ohm heating element.
What went wrong with the Mosfet and how can I prevent it?
Thankyou
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