Powerint LNK417EG 15W离线LED驱动电源方案(DER284)
图3. LinkSwitch-PH系列绝缘无调光高功率因素通用输入7W LED驱动器电路图 采用LNK417EG无电解电容高效率(≥90%) PFC大于0.9的15W LED驱动器参考设计
This document describes an isolated, power factor corrected, very high efficiency LED driver designed to drive a 30 V LED string at a current of 500 mA (nominal). The input voltage range is 90 VAC to 265 VAC.
The LED driver uses a LNK417EG device from the LinkSwitch-PH family of ICs. This integrated controller and 725 V MOSFET dramatically reduces the complexity and component count of the solution.
The key design goals were to achieve the highest possible efficiency and eliminate electrolytic capacitors. Both are key factors for increasing the lifetime and reliability of LED drivers making this solution ideal for industrial and commercial applications.
No electrolytic capacitors
Clean monotonic start-up – no output blinking
Fast start-up ( 100 ms) – no perceptible delay
Highly energy efficient
o ≥90% at 115 VAC and 230 VAC input Low cost, low component count and small printed circuit board footprint solution
o No current sensing required
o Frequency jitter for smaller, lower cost EMI filter components Integrated protection and reliability features
o Output open-circuit / output short-circuit protected with auto-recovery
o Line input overvoltage shutdown extends voltage withstand during line faults.
o Auto-recovering thermal shutdown with large hysteresis protects both components and printed circuit board
o No damage during brown-out or brown-in conditions
Meets IEC 61000-4-5 ring wave, IEC 61000-3-2 Class C harmonics and EN55015 B conducted EMI