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PDF WS3441 Data sheet ( Hoja de datos )

Número de pieza WS3441
Descripción Non-isolated Buck Offline LED Driver
Fabricantes WINSEMI 
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WS3441 Hoja de datos, Descripción, Manual
WS3441 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 WS3441 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 WS3441 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 WS3441 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 WS3441 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 WS3441 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

WS3441 pdf
WS3441 ProductDescription
Electrical Characteristics (Unless otherwise specified, VCC=7V and TA =25 )
Symbol
Parameter
Conditions
Min
Supply Voltage Section
Vcc_clamp
VCC Clamp Voltage
Ivcc=1mA
Icc_clamp
VCC Clamp current
VCC_ST
VCC Turn On Threshold
VCC Rising
Vuvlo_HYS
VCC Turn off Hysteresis
VCC Falling
Ist VCC Startup Current
VCC<VCC_ST-0.5V
Iop VCC Operating Current
Current Sense Section
Vcs_th
Threshold Voltage for Peak
Current Limit
390
Leading Edge Blanking Time
TLEB for Current Sense
TDELAY
Switch Off Delay Time
Internal Time Control Section
TOFF_MIN
Minimum OFF Time
TOFF_MAX
Maximum OFF Time
TON_MAX
Maximum On Time
MOSFET Section
RDSON
Static Drain-source
On-resistance
Vcc=7V/Id=0.5A
VDS_BD
Drain-Source Breakdown
Voltage
Vgs=0V/Id=250uA
500
Power MOSFET Drain
Idss
Leakage Current
Vgs=0V/Vds=500V
ROVP section
VROVP
ROVP Pin Voltage
Thermal Regulation Section
Thermal Shutdown
TSD Temperature
TSD_HYS Thermal Shutdown Hysteresis
T_comp
Thermal Regulation
Temperature
Typ
7.3
6.9
1.5
230
200
400
350
300
3
340
53
12.8
0.5
160
20
150
Max Units
V
2.5 mA
V
V
270 uA
uA
410 mV
ns
ns
us
us
us
16 ohm
V
10 uA
V
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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