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PDF WS3442 Data sheet ( Hoja de datos )

Número de pieza WS3442
Descripción Non-isolated Buck APFC Offline LED Driver
Fabricantes WINSEMI 
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WS3442 Hoja de datos, Descripción, Manual
WS3442 ProductDescription
Features
Critical Conduction Mode Operation
Internal 500V Power MOSFET
No Auxiliary Winding
Ultra Low Operating Current
±3% LED Output Current Accuracy
Efficiency up to 93%
LED Open Protection
LED Short Protection
Current Sensing Resistor Short Protection
Thermal Regulation Function
Available in SOP-8 Package and DIP-7 Package
Applications
LED Candle Light
LED Bulb, Spot Light
T8/T10 LED String
Other LED Lighting
Typical Application(SOP-8 Package)
Non-isolated Buck Offline LED Driver
Description
The WS3442 is a high precision buck constant current
LED driver. The device operates in critical conduction mode
and is suitable for 85Vac~265Vac universal input offline LED
lighting.
The WS3442 integrates a 500V power MOSFET. The
operating current of the IC is very low. So it doesn’t need the
auxiliary winding for supplying the chip. It can achieve
excellent constant current performance with very few external
components, so the system cost and size are minimized.
The WS3442 utilizes patent pending current control
method. It can achieve precise output current and excellent
line regulation. The driver operates in critical conduction
mode, the output current does not change with the inductance
and LED output voltage.
The WS3442 offers rich protection functions to improve
the system reliability, including LED open circuit protection,
LED short circuit protection, VCC under voltage protection,
CS resistor short circuit protection and thermal regulation
function.
The WS3442 is available in SOP-8 Package and DIP-7
Package.
AttentionA 22pF capacitor can be parallel with Rovp and a resistor can be parallel with the Vcc capacitor.
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
Copyright@Winsemi Microelectronics Co., Ltd., All right reserved.
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
1105

1 page

WS3442 pdf
WS3442 ProductDescription
Electrical Characteristics (Unless otherwise specified, VCC=7V and TA =25 )
Symbol
Parameter
Conditions
Min Typ Max Units
Supply Voltage Section
Vcc_clamp
VCC Clamp Voltage
Ivcc=1mA
7.3 V
Icc_clamp
VCC Clamp current
2.5 mA
VCC_ST
VCC Turn On Threshold
VCC Rising
6.9 V
Vuvlo_HYS
VCC Turn off Hysteresis
VCC Falling
1.5 V
Ist VCC Startup Current
VCC<VCC_ST-0.5V
230 270 uA
Iop VCC Operating Current
200 uA
Current Sense Section
Vcs_th
Threshold Voltage for Peak
Current Limit
390 400 410 mV
Leading Edge Blanking Time
TLEB for Current Sense
350 ns
TDELAY
Switch Off Delay Time
300 ns
Internal Time Control Section
TOFF_MIN
Minimum OFF Time
3 us
TOFF_MAX
Maximum OFF Time
340 us
TON_MAX
Maximum On Time
53 us
MOSFET Section
RDSON
Static Drain-source
On-resistance
Vcc=7V/Id=0.5A
4.8 6 ohm
VDS_BD
Drain-Source Breakdown
Voltage
Vgs=0V/Id=250uA
500
V
Power MOSFET Drain
Idss
Leakage Current
Vgs=0V/Vds=500V
10 uA
ROVP section
VROVP
ROVP Pin Voltage
0.5 V
Thermal Regulation Section
Thermal Shutdown
TSD Temperature
160
TSD_HYS Thermal Shutdown Hysteresis
20
T_comp
Thermal Regulation
Temperature
150
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
www.winsemi.com Tel : +86-755-8250 6288 Fax : +86-755-8250 6299
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
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