WS9822B Datasheet, PDF (1/11 Pages) List of Unclassifed Manufacturers – Non-isolated Buck High Precision Three-stage Dimming LED Driver

WS9822B Product Description
Non-isolated Buck High Precision Three-stage Dimming LED Driver
Features
 Three-stage switcher dimming: 100%-40%-15%
 Compatible PCB with WS3442
 Internal 500V Power MOSFET
 Critical Conduction Mode Operation
 ±3% LED Current Accuracy
 without Auxiliary Winding for power supplying
 Efficiency up to 93%
 LED Open and Short Circuit Protection
 Thermal Regulation Function to avoid lights flicking
under high temperature.
Typical Applictions
 T5/T8 LED Strings
 Ceiling Lamps
 Bulbs
 Other LED Lightings
Description
The WS9822B is a three-stage dimming constant current
LED driver with high precision and is applied to non-isolated
buck LED power system. The WS9822B integrates a switch
dimming circuit and can change the output current through
switch shifting.
The device operates in critical conduction mode and is
suitable for universal input offline LED lighting to dim with
three-stage by switcher.
The WS9822B utilizes proprietary current control method.
It can achieve precise LED output current and excellent line
regulation.
The operating current of the IC is as low as 120uA. So it
doesn’t need the auxiliary winding for supplying the chip,
which brings more simplified designs and lower cost.
The WS9822B adopts intelligent temperature control and
thoroughly solves the problem of LED flickering under high
temperature.
The WS9822B offers multiple protection functions to
improve the system reliability, including LED open circuit
protection, LED short circuit protection, and VCC under
voltage protection.
Typical Application Circuit
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