WS3220A Datasheet, PDF (1/9 Pages) Shenzhen Winsemi Microelectronics Co., Ltd – WS3220A High Precision PSR Constant Current LED Driver

WS3220A Product Description
WS3220A High Precision PSR Constant Current LED Driver
Features
■ Built-in 650V Power MOSFET
■ ±5% LED Current Accuracy
■ Primary-side Sensing and Regulation Without TL431
and Opto-coupler
■ No Auxiliary Winding For Sensing And Supplying
■ Ultra low operating current
■ LED Open/Short Circuit Protection
■ CS Resistor Short Circuit Protection
■ VCC Clamp & under voltage lockout( UVLO)
■ Over Temperature Protection
Applications
■ GU10 LED driver
■ LED spot light
■ Other LED lighting
General Description
WS3220A 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 5W.
WS3220A integrates 650V power MOSFET. Since adopting
primary sense and feedback control technology, the
secondary sense and feedback circuit is eliminated. And it
does not 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 high accurate current sense method,
WS3220A realizes ±5% accuracy of LED current along with
excellent line and load regulation.
WS3220A offers comprehensive protection including
Cycle-by-Cycle current limiting (OCP), LED open/short circuit
protection, CS resistor short circuit protection, VCC UVLO and
Clamp, and over temperature protection.
WS3220A is available in SOP8 package.
Typical Application Circuit
NP
NS
AC
4 OUT
3 VCC
1 CS
2 GND
NC 8
NC 7
D ra in ⁶
D ra in 5
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Copyright@Winsemi Microelectronics Co., Ltd., All right reserved.
WIN SEM I M ICROELECTRON ICS
W/T-S025-Rev.A/1 May.2014
WIN SEM I M ICROELECTRON ICS
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