Sidd59
Newbie level 3
I am testing a Commercial SiC gate driver CGD15SG00D2. We will find the data sheet here:
The driver is designed for SiC Mosfets and is able to switch on and off the FETs with +15V and -3.3V respectively.
To test this gate driver card , I am sending PWM of 3.3V from a micro-controller and measuring the output of the gate-driver ( gate-source pins) with a differential probe. Additionally, I am powering up the gate driver with 12V laboratory power supply.
My test-setup looks like this:
The waveform of the gate-source pin when no when no MOSFET is connected looks like this: As you can see there is huge positive and negative spikes during turn-on and off.
I also tried to connect the corresponding terminals to the gate and source pin of single isolated SiC Fet, just to charge and discharge the gate capacitor to see if the spikes goes away. However only upper peak was reduced by one Volt but negative spike remained the same.
What am I missing? I am doing something stupid during the measurement? I twisted the cable of the differential probe as well with no effect.,
Thanks in advance and happy weekend!
best,
Sidd
The driver is designed for SiC Mosfets and is able to switch on and off the FETs with +15V and -3.3V respectively.
To test this gate driver card , I am sending PWM of 3.3V from a micro-controller and measuring the output of the gate-driver ( gate-source pins) with a differential probe. Additionally, I am powering up the gate driver with 12V laboratory power supply.
My test-setup looks like this:
The waveform of the gate-source pin when no when no MOSFET is connected looks like this: As you can see there is huge positive and negative spikes during turn-on and off.
I also tried to connect the corresponding terminals to the gate and source pin of single isolated SiC Fet, just to charge and discharge the gate capacitor to see if the spikes goes away. However only upper peak was reduced by one Volt but negative spike remained the same.
What am I missing? I am doing something stupid during the measurement? I twisted the cable of the differential probe as well with no effect.,
Thanks in advance and happy weekend!
best,
Sidd