Hello
Some MOSFET has drive source and power source. How do I connect the driver with the MOSFET.
Like Infineon IPDQ60R010S7, the part has power source and drive source.
Normally, I would connect the power source of the MOSFET to 0V.
The output of the drive should be connected to gate of the MOSFET. But how to connect the GND of the drive. For sure, I will connect it to the drive source. But is it necessary also to connect it to 0V?
Hello,
I apologize for the delay in response; TI was on a US holiday. To answer the first part of your question, the power source and drive source of the MOSFET are both connected to the GND of the driver in a low-side configuration. Your schematic is correct.
To answer the second part, as long as the potential difference between VDD and GND and IN and GND are within specs, you can set "GND" to be any voltage. For example, see the below figure:
As long as the voltages in respect to the driver ground is within specs, it should be fine. For example, say RVCC is 15V, and the bus voltage is 400V. The driver's VDD sees 415V, but since it's in respect with the 400V seen by the driver GND and IN- pins, the differential voltage is 15V, which is within the UCC27517A's specs. Essentially, that 400V seen by the GND and IN- pins is analogous to 0V.
Thanks,
Rubas
Hello,
You can connect the drive source to the GND of the gate driver and the power source to the power ground. I attached a picture of the typical application for the LMG1210, which shows an example of the connection I described on the low-side FET.
Thanks,
Rubas
