SLUSD37E October 2017 – November 2019 UCC28056
Supply undervoltage lockout (UVLO) protection ensures that the controller operates only while the supply voltage is in a range that ensures correct operation and adequate Gate drive amplitude for the power switch.
The controller remains in a dormant state, consuming little ICC current (ICC_Startup), until the VCC pin voltage exceeds VCCStart. Once VCCStart is exceeded, the controller wakes into its Stopb state. After waking, the controller proceeds with its normal start-up process.
The controller stops switching if the VCC pin voltage falls below VCCStop for a longer period than TUVLOBlk. The controller then returns to a dormant condition. During this dormant period, the controller consumes a relatively small amount of supply current (ICC) until it exceeds the VCCStart threshold again.