1. Project name:

QW2886 3-12W emergency fast charge to VCC overall solution

Second, the main description

QW2886 is a special chip for emergency detection and control. The chip adopts patented high-voltage isolation and detection technology, which directly monitors the status of the AC input signal without any external components, and directly or indirectly drives the LED light string. Also supports full voltage 85-265Vac input.

QW2886 integrates high-precision single-cell lithium battery management and MOSFET. It has the functions of overcharge protection, overdischarge protection, overcurrent protection and short circuit protection.

QW2886 has built-in reverse battery protection function. When the battery is reversely connected, it will automatically protect the battery and cut off the internal current path, so that the battery will not be damaged by overcurrent.

The QW2886 EN side supports up to 2A drive capability. A current limiting resistor can be directly connected in series to directly drive a single string of LEDs, and an external boost circuit is also supported to drive multiple strings of LEDs.

The QW2886 is packaged in a ROHS SP-8 package and has an operating temperature range of -40°C to 105°C.

3. Program functions and features:

1. Minimalist application circuit;

2. Accurate AC input impedance detection;

3. 85-265Vac full voltage input;

4. Direct drive capability of EN up to 2A;

5. Perfect battery protection and management, built-in battery reverse connection protection.

Fourth, application

· All and all bright LED emergency lights

· Full string semi-bright LED emergency light

·LED emergency light with boost circuit

fire emergency lights

*Notes on PCB layout:

Proper PCB layout is important to maximize system stability and low noise. Using a multi-layer PCB board is a very effective way to avoid noise interference. In order to effectively reduce the noise of the current loop, the input bypass capacitor should be grounded separately. Connect the high-current ground return, the ground lead of the input bypass capacitor, and the ground lead of the output filter to the same point (star ground connection) to minimize ground noise.