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WS9822B

Typical Applictions
T5/T8 LED Strings
Ceiling Lamps
Bulbs
Other LED Lightings

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.
 

Structure Type

Part No.

MOS

Package

App. Watt

OVP

PDF

176-264Vac

90-264Vac

Non-isolation

PF0.5

WS9822B

2A/500V

SOP7

80V/280mA 120V/220mA

80V/220mA60V/300mA

External Set

WS9822B.pdf

 

DIP7

120V/280mA

160V/220mA

80V/300mA

 

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.
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