Powerint 3.67W LED驱动器反激设计方案
New Design for 3.67W LED Driver Using Flyback Topology
Design Highlights:
Green package: halogen free and RoHS compliant
Highly energy efficient
Full load efficiency >74% throughout operating range
No-load consumption <200 mW at 265 VAC
Figure 1 provides the schematic for a universal input, 10.5 V, 350 mA CV/CC power supply using the LinkSwitch-II LNK605DG (U1) in a flyback configuration, useful for LED driver applications.
The design is intended to drive a 3 LED series string, delivering the rated output current over the range of LED VF. Integrated circuit U1 consists of a power switching device, an oscillator, a CV/CC control engine, startup and protection functions. The primary side CV/CC control functionality of U1 eliminates the need for sense resistors and optocouplers, which results in an ultra-compact footprint for this design which can mechanically fit inside a GU-10 LED enclosure.
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