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using PWM from Arduino with CSD18535KCS

Other Parts Discussed in Thread: CSD18535KCS

I'm trying to build a DC light controller and I'm having all kinds of problems. My setup is a 12 volt car battery and a headlight, I have the CSD18535KCS MOSFET on the low side and an Arduino send a PWM signal directly to the gate.

IF I send pure 5V DC to the gate the light of course works and the temp stays aroudn 100 deg F--i have a good size heat sink. If i send a PWM (32,250 Hz) let's jsut say a 50% duty cycle to the gate, the MOSFET gets super hot after a few minutes.

Do I need to somehow filter the PWM to send pure DC to the gate? Is my frequency too high? I have an LCD read out hooked to the Arduino to display the duty cycle and it goes crazy once PWM is turned on. If I disconnect the PWM from the gate, the LCD works fine.

No clue...any thoughts?