Powerint LNK605DG高效3.6W LED驱动方案（DER261）

Powerint公司的LinkSwitch-II系列 LNK605DG集成了700V功率MOSFET，新颖的OM/OFF控制状态机，用于自偏压的高压开关电流源，逐个周期的电流限制以及延迟的热关断电路。由于不需要光耦合器和次级控制电路，因此大大地简化了低功率CV/CC充电器的设计。230VAC时无负载的功耗低于30mW，主要用于手机/无绳电话，PDA，MP3/手提音频设备的充电器，以及LED驱动器等。本文介绍了LinkSwitch-II系列 LNK605DG主要特性，功能方框图，高能效USB充电器电路图，无偏压电源的反激电源电路图以及采用LinkSwitchTM-II LNK605DG的高效（≥75%) 3.6W绝缘LED驱动器参考设计主编要特性与指标，电路图和材料清单（BOM）。

The LinkSwitch-II dramatically simplifies low power CV/CC charger designs by eliminating an optocoupler and secondary control circuitry. The device introduces a revolutionary control technique to provide very tight output voltage and current regulation, compensating for transformer and internal parameter tolerances along with input voltage variations.

The device incorporates a 700 V power MOSFET, a novel ON/OFF control state machine, a high voltage switched current source for self biasing, frequency jittering, cycle-by-cycle current limit and hysteretic thermal shutdown circuitry onto a monolithic IC.

LNK605DG 产品亮点：

Dramatically Simplifies CV/CC Converters

• Eliminates optocoupler and all secondary CV/CC control circuitry

• Eliminates all control loop compensation circuitry
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