Friday, 3 April 2015

mosfet driver - High-side switch for 24V controlled by logic level


I mainly use this high-side switch design for 5V and with low current loads (under 100mA).



enter image description here


Based on the VDSS (-50V), I thought I could energize this design with 24V as well. Apparently, I am making a mistake by interpreting the VDSS. Even there is no load attached (Drain is only connected to voltmeter), when I connect to 24V source, Mosfet doesn't response to I/O input change (High or Low) anymore and always stays ON. Even I connect to a 5V source again, it still stays ON, another saying I believe the mosfet is gone.


Would you please tell me what is wrong here?




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