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PDF WS9822B Data sheet ( Hoja de datos )
| Número de pieza | WS9822B | |
| Descripción | Non-isolated Buck High Precision Three-stage Dimming LED Driver | |
| Fabricantes | Winsemi | |
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WS9822B Product Description
Non-isolated Buck High Precision Three-stage Dimming LED Driver
Features
Three-stage switcher dimming: 100%-40%-15%
Compatible PCB with WS3442
Internal 500V Power MOSFET
Critical Conduction Mode Operation
±3% LED Current Accuracy
without Auxiliary Winding for power supplying
Efficiency up to 93%
LED Open and Short Circuit Protection
Thermal Regulation Function to avoid lights flicking
under high temperature.
Typical Applictions
T5/T8 LED Strings
Ceiling Lamps
Bulbs
Other LED Lightings
Description
The WS9822B is a three-stage dimming constant current
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.
The device operates in critical conduction mode and is
suitable for universal input offline LED lighting to dim with
three-stage by switcher.
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
temperature.
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.
Typical Application Circuit
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
Copyright@Winsemi Microelectronics Co., Ltd., All right
reserved.
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
0121
1 page  
WS9822B Product Description
Electrical Characteristics
Conditions： TA=25℃，VCC=14V（Unless otherwise specified）
Symbol
Parameter
Test condition
Power Supply Section
VCC_CLAMP
VCC Clamp Voltage
IVCC=1mA
ICC_CLAMP
VCC Clamp Current
UVLO_OFF
Chip Startup Voltage
VCC Rising
UVLO_ON _HYS
Under voltage
Protection Hysteresis
VCC Falling
IST
Startup Current
VCC=UVLO_off-0.5V
IOP Operating Current
Current Detection Section
VCS_TH
Threshold Voltage for Peak
Current Limitation
VCS_DIM
Threshold Value for
Dimming Test
TLEB
Leading Edge Blanking Time
for Current Sense
TDELAY
Switch Off Delay Time
Switching Frequency Section
TOFF_MIN
Minimum OFF Time
TOFF_MAX
Maximum OFF Time
TON_MAX
Maximum On Time
VROVP
ROVP PIN Voltage
DIM Dimming Section
TRESET
Shutdown Reset Time
MOSFET Section
IDSS
BVDSS
RDS_ON
Thermal section
Power MOSFET Drain
Leakage Current
Drain-Source Breakdown
Voltage
Static Drain-source
On-state resistance
VGS=0V,VDS=500V
TREG
Thermal Regulation
Temperature
Min
65
500
Typ
16
5
15.8
3.5
130
120
400
114
350
200
3
240
40
0.5
5
4.8
150
Max
20
195
10
6
Unit
V
mA
V
V
uA
uA
mV
mV
ns
ns
us
us
us
V
S
uA
V
Ω
℃
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
www.winsemi.com Tel : +86-755-8250 6288 Fax : +86-755-8250 6299
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
5/11
5 Page 
WS9822B Product Description
NOTE:
1.We strongly recommend customers check carefully on the trademark when buying our product, if there is any
question, please don't be hesitate to contact us.
2.Please do not exceed the absolute maximum ratings of the device when circuit designing.
3.Winsemi Microelectronics Co., Ltd reserved the right to make changes in this specification sheet and is
subject to change without prior notice.
CONTACT:
Winsemi Microelectronics Co., Ltd.
ADD：Room 1002, East, Phase 2, HighTech Plaza,Tian-An Cyber Park,Chegongmiao, FuTian, Shenzhen, P.R.
China
Post Code : 518040
Tel : +86-755-8250 6288
FAX : +86-755-8250 6299
Web Site : www.winsemi.com
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
www.winsemi.com Tel : +86-755-8250 6288 Fax : +86-755-8250 6299
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
11/11
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet WS9822B.PDF ] | |
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