On-Bright confidential to ...
OB3341S
Buck LED Driver with High PF
GENERAL DESCRIPTION
The OB3341S is a high power fac...
On-Bright confidential to ...
OB3341S
Buck LED Driver with High PF
GENERAL DESCRIPTION
The OB3341S is a high power factor, monolithic Buck
regulator with advanced features to provide high efficiency control and high accuracy constant current output for LED lighting applications.
OB3341S integrates a 2A MOSFET to decrease physical volume. It adopts constant on time control for power factor correction (PFC), zero current detectors (ZCD) to ensure quasi-resonant valley turn-on for high efficiency operation.
OB3341S offers good protection coverage including VCC under voltage lockout (UVLO), VCC over voltage protection, cycle-by-cycle current limiting, over temperature protection, COMP pin floating protection and LED open/short protection.
OB3341S is provided with DIP8 package.
FEATURES
Buck topology power switching with single stage PFC (PF>0.9)
Integrated 2A 600V MOSFET Quasi-resonant valley turn-on mode
operation to achieve high efficiency (>90%) High accuracy output current (±3%) LED open/short protection Low power dissipation at LED short Ultra-low start-up current (typical 5uA)
APPLICATIONS
LED lighting
Tube lighting
PAR lighting
Bulb lighting
TYPICAL APPLICATION
+Vin
OB3341S
1 VCC
DRAIN 8
2 ZCD
DRAIN 7
3 GND
SOURCE 6
4 COMP
CS 5
Figure1: OB3341S Typical Application Schematic
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Preliminary Datasheet OB_DOC_DS_3341S00
GENERAL INFORMATION
Terminal Assignment In DIP8 Package.
VCC ZCD GND COMP
1 2 3 ...