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Question: Is it possible to control both the external and internal FET simultaneously with the same Hysteretic controllers?
No, at any given point of time, either the internal FET or the external FET must be controlled with a single Hysteretic controller, but not both simultaneously. However, the change between the internal and external FET can be carried out on the fly using the API ‘HYSTCTRL_SetGateDriver (bSelect)’. A bSelect of 01 would choose internal driver, a value of 02 would choose external driver. System performance is not guaranteed if the register is written in a way to enable both internal and external MOSFETs and must not be attempted.