WS3221 LED Driver Datasheet

WS3221 Datasheet, PDF, Equivalent


Part Number

WS3221

Description

High Precision PSR Constant Current LED Driver

Manufacture

WINSEMI

Total Page 9 Pages
Datasheet
Download WS3221 Datasheet


WS3221
WS3221 Product Description
WS3221 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
■ External programmable LED Open voltage
■ CS Resistor Short Circuit Protection
■ VCC Clamp & under voltage lockout( UVLO)
■ Over Temperature Protection
■ Temperature compensation technology
Applications
■ GU10 LED driver
■ LED spot light
■ Other LED lighting
General Description
WS3221 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 7W.
WS3221 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, WS3221
realizes ±5% accuracy of LED current along with excellent line
and load regulation.
Advanced temperature compensation is applied to eliminate
flicker of LED at high temperature
WS3221 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.
WS3221 is available in SOP8 package.
Typical Application Circuit
Np Ns
AC
2 VCC
4 ROVP
1 CS
3 GND
NC 5
NC 6
Drain 7
Drain 8
WIN SEM I M ICROELECTRON ICS
WIN SEM I M ICROELECTRON ICS
WIN SEM I M ICROELECTRON ICS
Copyright@Winsemi Microelectronics Co., Ltd., All right reserved.
WIN SEM I M ICROELECTRON ICS
W/T-S042-Rev.A/0 Mar.2014
WIN SEM I M ICROELECTRON ICS
0314

WS3221
WS3221 Product Description
Pin Definition and Device Marking
WS3221 is offered in SOP-8 packagesas shown below
CS 1
VCC 2
GND 3
ROVP 4
8 Dra in
7 Dra in
6 NC
5 NC
WS3221S8P: Product code
A: Die Code
X: Internal Code
B: Area Code
YM:Year, Month
Pin Function Description
Pin Pin
Name
Number
Pin Type
CS 1
Current Sense
VCC
GND
ROVP
NC
Drain
2
3
4
5,6
7,8
Power Supply
Ground
Input
NC
Drain
Block Diagram
VCC
Function Description
Current sense. This pin connects a current sense resistor to GND to
detect the primary current of transformer.
Power supply.
Ground.
Setting LED open voltage by connect a resistor to GND
No connection, must be floated
Internal high voltage MOSFET drain.
D ra in
Bias &
internal supply
5.1V 7.45V
8 .1 V
650V
PowerMOS
OCP
OTP
Temperat ure
compensation
D e m a g n e tiz
a tio n
detected
CC loop & Logic control
UVLO
LED Open
protection
LEB
OCP
0 .5 V
Line-comp
CS
ROVP
GND
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WINSEM I M ICROELECTRONICS
www.winsemi.com Tel : +86-755-8250 6288 Fax : +86-755-8250 6299
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Features WS3221 Product Description WS3221 High Precision PSR Constant Current LED Driv er Features ■ Built-in 650V Power MO SFET ■ ±5% LED Current Accuracy ■ Primary-side Sensing and Regulation Wit hout TL431 and Opto-coupler ■ No Auxi liary Winding For Sensing And Supplying ■ Ultra low operating current ■ LE D Open/Short Circuit Protection ■ Ext ernal programmable LED Open voltage ■ CS Resistor Short Circuit Protection VCC Clamp & under voltage lockout( U VLO) ■ Over Temperature Protection Temperature compensation technology A pplications ■ GU10 LED driver ■ LED spot light ■ Other LED lighting Gene ral Description WS3221 is a high precis ion primary-side feedback and regulati on controller for LED lighting, it oper ates in constant current control mode a nd is designed to work in inductor curr ent discontinuous conduction mode and e specially suitable for flyback converto r under universal input. The output pow er of system is recommended to less than 7W. WS3221 integrates 650V power MOSFET. Since adop.
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