Power Integrations LNK625DG 5W适配器参考设计RDR－669

Power Integrations公司的LNK625DG是LinkSwitchTM-CV系列中的产品.器件组合了专有IC调整和E-Shield™变压器结构技术,使得采用LinkSwitch-CV LNK623/4进行无箝位(Clampless™)设计.LinkSwitch-CV器件提供了极好的交叉调整,以用于多个输出反激应用如DVD和STB.725V功率MOSFET和ON/OFF控制状态机,自偏压,频率抖动,逐个周期的电流限制,滞后的热关断电路也集成在单个器材内.对于输出短路和所有控制回路故障,自动重起保护降低功耗大于95%.230VAC时无负载损耗小于200mW,当选择外接偏压时损耗可低至70mW.主要用在DVD/STB,适配器,家用电器,白色家电和消费类电子学以及工业控制.本文介绍了LNK625DG产品亮点,功能框图,以及采用LinkSwitchTM-CV LNK625DG的5W/5V适配器参考设计RDR 669主要特性和指标,电路图,材料清单和PCB设计图.

The LinkSwitchTM-CV dramatically simplifies low power, constant voltage(CV) converter design through a revolutionary control technique whicheliminates the need for both an optocoupler and secondary CV controlcircuitry while providing very tight output voltage regulation. Thecombination of proprietary IC trimming and E-Shield™ transformerconstruction techniques enables Clampless™ designs with theLinkSwitch-CV LNK623/4.

LinkSwitch-CV provides excellent cross-regulation for multiple-outputflyback applications such as DVDs and STBs. A 725 V power MOSFETand ON/OFF control state machine, self-biasing, frequency jittering,cycle-by-cycle current limit, and hysteretic thermal shutdown circuitryare all incorporated onto one IC.

LNK625DG产品亮点:

Dramatically Simplifies CV Converters

• Eliminates optocoupler and all secondary CV control circuitry

• Eliminates bias winding supply – IC is self biasing

Advanced Performance Features

• Compensates for external component temperature variations

• Very tight IC parameter tolerances using proprietary trimmingtechnology

• Continuous and/or discontinuous mode operation for designflexibility

• Frequency jittering great...