JAJU459B 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. This is taken care of by using a capacitor C7 of 10 μF at the output of the switch. Figure 3-14 shows the test results. Use a higher value of capacitance to minimize the voltage drop in VCC2 during the 100-µs STO pulses.