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WS3241 Schematic ( PDF Datasheet ) - WINSEMI

Teilenummer WS3241
Beschreibung High Precision PSR LED Constant Current Driver
Hersteller WINSEMI
Logo WINSEMI Logo 




Gesamt 8 Seiten
WS3241 Datasheet, Funktion
WS3241 ProductDescription
High Precision PSR LED Constant Current Driver
Features
Built-in 650V UHV Power MOS
LED Constant Current: ±5%
Fixed Primary Peak Current: 185mA
Without the Secondary winding
Start up time less than 100ms
High precision constant current regulation due to
patented CC control
Built-in line compensation
Ultra low operation current
Maximum power 4W
LED open/short protection
Floating pin protection
Excellent EMI performance with PFM control
Cycle-by-cycle current limit
Built-in leading Edge Blanking
VDD Under Voltage LockoutUVLO
Built-in over temperature protection
Applications
LED lighting
Description
WS3241 is a high precision primary side feedback
constant current LED driver, suitable for flyback isolated
LED in sub 4W power range at universal AC input. It
operates in discontinuous current mode.
WS3241 integrates 650V power MOS. It operates in
primary side sensing and regulation, without a secondary
feedback circuit, also need not the auxiliary transformer
winding detection and power supply, only need few
peripheral components can realize constant current,
greatly saves the cost and size of the system.
The start time of WS3241 is less than 100ms at
universal AC input with the high voltage start technology,
realizing instant bright of the LED lamp.
The current precision is less than ± 5%
with high precision current sampling circuit and line
compensation. With patented constant current controlling
mode, excellent linear regulation is achieved.
WS3241 provides a variety of comprehensive
protection mode, including: cycle by cycle current limit
protection(OCP), LED open/short circuit protection, under
voltage protection and clamping, over temperature
protection, pin floating protection etc..
WS3241 is offered in TO-92 package.
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
Copyright@Winsemi Microelectronics Co., Ltd., All right reserved.
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
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WS3241 Datasheet, Funktion
WS3241 ProductDescription
voltage spike on the current sense resistor at initial
MOSFET on state. The typical value of lead edge blanking is
500ns. The current limit comparator is disabled and thus
cannot turn off the internal MOSFET.
PFM Control improves the EMI performance
WS3241 uses the PFM control method, which can
improve the system performance. Because PFM belongs to
frequency conversion control, built-in spread spectrum
function.
Over Voltage Protection
WS3241 has a built-in over voltage protection circuit.
When the LED open, the output voltage increased cycle by
cycle, secondary demagnetization time induced. When the
secondary demagnetization time is less than 5us, the over
voltage protection will be triggered.
Minimum off time
WS3241 integrates the minimum off time control, the
typical value is 3.6us. It prevents the interference on the chip
operation voltage caused by the burrs of the switch off,
especially when larger leakage inductance of the
transformer and lower output voltage.
Pin Floating Protection
In WS3241, pin floating phenomenon will not cause
damage to the system.
Automatic restart protection
In WS3241, protection is locked when a certain
protection is triggered, while the switching stops, intering
restart delay mode. Here the VDD voltage is oscillates
between 5.3V and 5.8V, and entering into normal start mode
after 64 cycles. After start up, it works and confirms whether
the protection is removed. If the protection is not removed,
the chip will enter into protection latch state, and repeat
delay to restart, until the protection is released.
Soft Driver of Internal Power MOSFET
WS3241 has a built-in soft driver, improving the EMI
performance, realizing a balance between the efficiency, the
reliability and the EMI.
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
www.winsemi.com Tel : +86-755-8250 6288 Fax : +86-755-8250 6299
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