TIDUDS9B December 2017 – November 2022
The MCU periodically sends low pulses of 100 µs. The VCC1 does not fall much below the UVLO of the gate driver during this time period. A capacitor of 0.47 µF ensures that VCC_1 does not fall below the UVLO threshold. Use a higher value of capacitance to minimize the voltage drop in VCC1 during the 100-µs STO pulses. Figure 3-9 shows the test results.