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UCC27517A: UCC27517A used at high side in half bridge with conjuction with ucc256403

Part Number: UCC27517A

I am using UCC27517A as gate drivers for high side and low side mosfets. 

1) For the High side mosfet, the HS pin is connected to GND and IN- of UCC27517A. As the HS pin is switching node and 400V appears on it , can IN- and GND pin can handle 400v?

2) what is the IC current consumption when it drives the mosfet with 4A source current, I want to know how much VCC should be able to supply when it is supplying peak current

  • Hi Hema,

    1. 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.

    2. The total operating supply current of the UCC27517A when it's switching is the sum of the quiescent current IDD, average Iout current due to switching, and any related to unused pins with internal pull-up resistors (the IN- pin has a 200k pull-up resistor, so when unused, 60 uA will be used up with VDD = 12V). The quiescent currents can be found with the following plots: