SLUSFS4A September 2025 – September 2025 UCC27734-Q1 , UCC27735-Q1
PRODUCTION DATA
Both the high-side and the low-side driver stages include UVLO protection circuitry which monitors the supply voltage (VVDD–VSS) and the bootstrap capacitor voltage (VHB to VHS). The VDD UVLO circuit inhibits both LO and HO, while the HB UVLO circuit inhibits only HO. The UVLO circuits ensure each output remains low until sufficient supply voltage is available to turn on the external MOSFETs or IGBTs. The built-in UVLO hysteresis prevents chattering during supply voltage variations.