WS9822B Product Description
Non-isolated Buck High Precision Three-stage Dimming LED Driver
Features
Description
Three-stage switcher dimming: 100%-40%-15%
The WS9822B is a three-stage dimming constant current
Compatible PCB with WS3442
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.
Internal 500V Power MOSFET
Critical Conduction Mode Operation
±3% LED Current Accuracy
without Auxiliary Winding for power supplying
Efficiency up to 93%
The device operates in critical conduction mode and is
suitable for universal input offline LED lighting to dim with
three-stage by switcher.
LED Open and Short Circuit Protection
Thermal Regulation Function to avoid lights flicking
under high temperature.
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
Typical Applictions
temperature.
T5/T8 LED Strings
Ceiling Lamps
Bulbs
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.
Other LED Lightings
Typical Application Circuit
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