SLUSEM9A September 2022 – June 2024 UCC21755-Q1
PRODUCTION DATA
The FLT pin of UCC21755-Q1 is open drain and can report a fault signal to the DSP/MCU when the fault is detected through the DESAT pin. The FLT pin is pulled down to GND after the fault is detected, and is held low until a reset signal is received from RST/EN. The device has a fault mute time tFLTMUTE, within which the device ignores any reset signal.
The RST/EN is pulled down internally by a 50-kΩ resistor, and is thus disabled by default when this pin is floating. It must be pulled up externally to enable the driver. The pin has two purposes: