WS9221B Datasheet, PDF (1/8 Pages) List of Unclassifed Manufacturers – High Precision PSR Constant Current LED Driver

WS9221BProductDescription
High Precision PSR Constant Current LED Driver
Features
 Built-in650V Power MOSFET
 Constant current control without secondary sense and
feedback circuit.
 No Auxiliary winding for sensing and supplying
 Ultra low operating current to improve efficiency
 Universal input voltage
 ±5% LED current accuracy
 LED short and open circuit protection
 CS resistor short circuit protection
 VCC under-voltage protection
 Over temperature protection
 Available in SOP-7 package
Applications
 GU10/E27 LED bulb, spot light
 Other LED lighting
Description
The WS9221B is a high precision primary-side feedback
and regulation controller for LED lighting, it operates in
constant current control mode and is designed to work in
inductor current discontinuous conduction mode and
especially suitable for flyback convertor under universal input.
The output power of system is recommended to less than 3W.
The WS9221B integrates 650V power MOSFET. Since
adopting primary sense and feedback control technology, the
secondary sense and feedback circuit is eliminated. The loop
compensation components are also removed while
maintaining stability overall operating conditions. The
operating current is very low, and it doesn’t need the auxiliary
winding for sensing the output current and supplying the chip.
The low component counts and small system size
arerealized.
Since using the proprietary high accurate current sense
method, theWS9221B realizes ±5% accuracy of LED current
along with excellent line and load regulation.
The WS9221B offers rich protection functions including
LED open/short circuit protection, CS resistor short circuit
protection, over-temperature protection, VCC under voltage
protection.
Typical Application
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