I am working with a circuit configuration where a gate driver IC (ISO5852S) is used as a high-side gate driver and the bias supplies of this IC is coming from three isolated DC-DC converters. I intend to use this gate driver for high voltage (close to 10 kV). However, the gate driver IC is rated for maximum 5.7 kV. Hence, isolated DC-DC converters for bias supplies and optical fiber for PWM signal isolation are being used.
That said, whenever voltage level of the DC supply reaches close to 5.5 -6 kV, the gate driver becomes faulty. I am suspecting that the control/input side ground of the gate driver IC being in a floating state is causing the problem.
Any suggestion to solve this problem will be highly appreciated.
Is it practical to use a large valued resistor in between the control and power ground of the gate driver IC and another same valued resistor between the control ground and the input ground of the DC-DC converter so that the control ground has a specific reference voltage?
Thanks in advance.