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WS9252 Schematic ( PDF Datasheet ) - Winsemi

Teilenummer WS9252
Beschreibung High Precision PSR Constant Current LED Driver
Hersteller Winsemi
Logo Winsemi Logo 




Gesamt 8 Seiten
WS9252 Datasheet, Funktion
WS9252ProductDescription
High Precision PSR Constant Current LED Driver
Features
Constant current control without secondary sense and
feedback circuit.
±3% LED current accuracy
Ultra low operating current to improve efficiency
High resistance feedback resistor to improve efficiency
Universal input voltage
LED short and open circuit protection
VCC under-voltage protection
Feedback loop short circuit protection
Current sense resistor open circuit protection
Over temperature protection
No external loop compensation component required
Available in SOT23-5 package
Applications
GU10/E27 LED bulb, spot light
Other LED lighting
Description
The WS9252 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 extremely suitable for buckboost/flyback convertor
under universal input.
Since adopting primary sense and feedback control
technology, the secondary sense and feedback circuit is
eliminated. The loop compensation components are also
removed while maintaining stability overall operating
conditions. The low component counts and low BOM cost
are realized.
Since using the proprietary high accurate current
sense method, theWS9252 realizes ±3% accuracy of LED
current along with excellent line regulation and load
regulation.
The WS9252 offers rich protection functions including
LED short circuit protection, LED open circuit protection,
die over-temperature protection, VCC over voltage
protection, VCC under voltage protection and FB short
circuit protection. All the protection features are
auto-recovery.
Typical Application
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
Copyright@WinsemiMicroelectronics Co.,Ltd.,All rightreserved.
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
1208






WS9252 Datasheet, Funktion
WS9252ProductDescription
Bypass Capacitor
The bypass capacitor on VCC should be as close as
possible to the VCC pin
Ground Path
The power ground path for current sense should be
short, and the power ground path should be separated from
small signal ground path before the negative of the bulk
capacitor.
The Area of Power Loop
The area of main current loop should be as small as
possible to reduce EMI radiation, such as the primary
current loop, the snubber circuit and the secondary
rectifying loop.
FB Pin
The feedback divider should be as close as possible to
FB Pin and the node must keep away from dynamic node of
transformer.
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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