Primary-Side Regulator LED Controller With Active PFC for LED Drivers :DW8551
DONGWOON-DW8551 Order information
ORDERING PART NUMBER
2500/Tape and Reel
PWM Dimming LED Driver -Isolated LED constant current drive-DW8551 General Description:
The DW8551 is a primary-side control offline flyback controller with active power factor correction. It is especially designed for LED lighting system. The DW8551 controls the LED current accurately without using an opto-coupler, which can significantly simplify the design of LED lighting system. Utilizing an on-chip multiplier, the DW8551 achieves high power factor over wide line and load ranges.
The multi-protection function largely enhances the safety and reliability of the system, including over voltage protection; short circuit protection, LED open protection, cycle-by-cycle current limit, VCC UVLO and over-temperature protection.
PWM Dimming LED Driver -Isolated LED constant current drive-DW8551 Features:
●Real current control without secondary feedback circuit；
●High current accuracy of line regulation（±2.5%）；
●Active power factor correction（PF>0.9)；
●Low harmonic content(<10%)
●DW8551 External PWM dimming(5%~100%)
●High efficiency over wide operating range
●Cycle by cycle current limit
●Input over-voltage protection
●LED short protection
●LED open protection
●8-Pin SOP package
PWM Dimming LED Driver -Isolated LED constant current drive-DW8551 Applications:
●Isolated type LED driver applications
●PAR30、PAR38 Bulb light
●General lighting of flat panel displays
●General purpose constant current source
●In/Outdoor Lighting, Street, Roadway, Parking, Construction Lamp
PWM Dimming LED Driver -Isolated LED constant current drive-DW8551 Pin Information
Apply a PWM signal on this pin for external PWM dimming.
Voltage Loop Feedback Pin. VFB is used to detect open LED conditions by sampling the third winding voltage.
Rectified Voltage Sense Pin. The pin is used for sensing the AC line voltage to perform power factor correction.
Compensation Pin for Internal Error Amplifier. Connect a capacitor between the pin and GND to compensate the internal feedback loop.
Primary current sense Pin. The pin is used for cycle-by-cycle peak current control and limit.
Gate Driver for the External Main MOSFET Switch.
Power Supply Pin. This pin supplies current to the internal start-up circuit. This pin must be bypassed with a capacitor nearby.
PWM Dimming LED Driver -Isolated LED constant current drive-DW8551 Block Diagram:
PWM Dimming LED Driver -Isolated LED constant current drive-DW8551 Typical Application Circuit:
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