Electronic – MOSFET driver is running hot

mosfetmosfet-drivertemperature

I've built a simple circuit to test a combo of a MOSFET (SUP70030E) and a gate driver (TC4452):
Schematics

The MOSFET should be compatible with the gate driver (if I'm not reading the datasheets wrong) and the circuit works fine – I'm switching the LED on and off in 10 second intervals.

However, the gate driver starts running very hot very soon, and I'm measuring 150 mA at the gate driver VDD all the time. That's more than 3 orders of magnitude higher that what the datasheet says, and the current stays the same with both 0 and 1 at the input.

Any idea what could be causing this?

EDIT: The MOSFET is fine (keeps cold and easily switches when connecting directly to 12V), and the driver draws 150mA even with the output disconnected.

Best Answer

at first: let's look at TC4451/2 datasheet: http://ww1.microchip.com/downloads/en/DeviceDoc/20001987C.pdf The TC4451/TC4452 are single-output MOSFETdrivers. These devices are high-current buffers/drivers capable of driving large MOSFETs and insulated gate bipolar transistors (IGBTs).

Then look at Functional Block Diagram, an output already are powerful mosfet. Drop your Q1 and all around, and connect led+resistor to output 6 OR 7 and + OR - accordingly. don't connect 6 and 7 together.

Second: if it just LED, ESP32 has enough 1ma current on output to drive led.

and finally: are you sure your Q1 not burnt? take it separately, connect to as on your diagram, and using var. resistor slowly increase voltage on gate from 0 to 5, at "0" it will completely shut.