WS9225 Datasheet, PDF (1/8 Pages) Shenzhen Winsemi Microelectronics Co., Ltd – High Precision PSR Constant Current LED Driver

WS9225ProductDescription
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
 VCC under-voltage protection
 Over temperature protection
 Available in DIP-8 package and SOP-7 package
Applications
 LED bulb, spot light
 Other LED lighting
Description
The WS9225 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 fly back convertor under universal input.
The output power of system is recommended to less than
24W.
The WS9225integrates 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 are
realized.
Since using the proprietary high accurate current sense
method, theWS9225 realizes ±5% accuracy of LED current
along with excellent line and load regulation.
The WS9225 offers rich protection functions including
LED open/short circuit protection, over-temperature
protection, VCC under voltage protection.
Typical Application
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