ZHCSQT8 October 2023 LM74930-Q1
PRODUCTION DATA
Connect a resistor ladder as shown in Figure 7-9 for overvoltage and undervoltage threshold programming.
A disconnect switch is integrated between A and SW pin to monitor common source node voltage as well. This switch is turned OFF when EN pin is pulled low.
LM74930-Q1 also supports overvoltage clamp operation with circuit breaker (Timer)functionality. To enable device operation in overvoltage clamp with circuit breaker functionality, connect OVCLAMP pin to OV pin as shown in #IMAGE_XGF_ZPC_DZB. In case of overvoltage event, device clamps output voltage to threshold set by the external resistor divider R3, R4. The TMR pin source current during overvoltage clamp with circuit breaker functionality is 5.5-μA typical. The circuit breaker time after which load disconnect switch is turned off can be calculated using Equation 8.
The rest of the device functionality in terms of auto-retry and latch off behavior of HGATE drive is same as described in overcurrent with circuit breaker section.
where
CGATE_EFF is effective gate capacitance as seen by HGATE pin (CGS + CdVdT)
VOVF and VOVCLAMPF is a falling threshold of OV and OVCLAMP comparators respectively