QW2889F IC Schematic Pinout Repair Guide for Emergency Light Circuit

QW2889F IC Schematic Pinout Repair Guide for Emergency Light Circuit

QW2889F IC Schematic Diagram and Pinout. The QW2889F is an 8-pin emergency lighting control IC designed for rechargeable LED lighting applications. Its main job is not conventional digital communication; it combines AC line detection, emergency-light control, single-cell lithium battery management, battery protection, and LED drive functions in a compact SOP-8 package. The documented device supports 85V to 265V AC input and can drive an LED load directly through the EN pin or work with an external boost stage for higher LED loads. This makes the QW2889F especially relevant in rechargeable LED bulbs, emergency lamps, and backup lighting circuits where the same battery must charge during normal mains operation and power the LED during a power failure. One important correction is necessary when using generic pinout information: VL and VN are AC line-sensing inputs, not low-voltage communication pins . Pin 6 VDD is connected to the charger output, while Pin 5 BATP connects to the positive bat…