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[FAQ] Can TI's non-isolated half bridge drivers be used in 100% duty cycle applications?
TI’s non-isolated half bridge drivers do not internally generate the bias for the high side channel. Instead, they use an external bootstrap circuit to keep the high side biased. However, the bootstrap circuit cannot provide bias to the high-side channel when using 100% duty cycle, since it relies on the switching of the high side and low side FETs in order to charge the bootstrap capacitor to keep the high side biased: the capacitor CBOOT recharges when the high side FET is OFF and the low side FET is ON (Figure 1) and then it will discharge when the high side FET is ON and the low side FET is OFF (Figure 2). For details about the bootstrap circuit please refer to this application note: https://www.ti.com/lit/pdf/slua887
To achieve 100% duty cycle on the high side driver, there needs to be a constant bias on the high-side HB-HS pins to maintain the high-side floating supply above the HB-HS UVLO of the driver: