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DN06040/D
Design Note – DN06040/D
Universal Input, 20 W, LED Ballast
Device
Application
Input Voltage
Output Power
Topology
I/O Isolation
NCP1351
Solid State Lighting
85 – 265 Vac
20 W
Flyback
Yes
Other Specifications
Output 1
Maximum Output Voltage
Ripple
Nominal Current
33 V
Not Given
700 mA
PFC (Yes/No)
No
Target Efficiency
80% at nominal load
Max Size
125 x 37 x 35 mm
Operating Temp Range
Cooling Method/Supply
Orientation
Signal Level Control
0 to +70°C
Convection
No
Other Requirements
Circuit Description
Key Features
The NCP1351 controller provides for a low cost, variable
frequency, flyback converter. It incorporates a very low
quiescent current allowing for high value resistors to be
used as a start-up circuit direct from the HV rail.
The design comprises and input filter, bridge rectifier
(using low cost 1N4007 diodes), bulk capacitors and line
inductor in π-filter arrangement, the power stage,
rectifier diode and smoothing capacitors. Feedback is
CVCC, constant current drive for the LED’s with a
constant voltage in the event of an open circuit output.
In order to stay below IEC6100-3-2 Class C, the design
has been optimized at