JAJSLG4 december 2022 LM7480
PRODUCTION DATA
HGATE and OUT comprises of Load disconnect switch control stage. Connect the Source of the external MOSFET to OUT and Gate to HGATE.
Before the HGATE driver is enabled, following conditions must be achieved:
Voltage at Vs pin must be greater than Vs POR Rising thershold.
For Inrush Current limiting, connect CdVdT capacitor and R1 as shown in Figure 9-3.
The CdVdT capacitor is required for slowing down the HGATE voltage ramp during power up for inrush current limiting. Use Equation 2 to calculate CdVdT capacitance value.
where IHATE_DRV is 55 μA (typ), IINRUSH is the inrush current and COUT is the output load capacitance. An extra resistor, R1, in series with the CdVdT capacitor improves the turn off time.