[原创] PowerIntLNK36042．5W非隔离反激转换器参考设计DER－578

摘要:Power Integrations公司的LinkSwitch-XT2系列是高效离线开关电源IC,集成了725V功率MOSFET,振荡器,简便ON/OFF控制方案,高压开关电流源,频率抖动,逐个周期限流和热关断电路.具有容易设计和优于线性/RCC的特性,主要用在电器,工业系统和仪表的电源.本文介绍了LNK3604产品亮点和功能框图,典型应用电路以及2.5W通用输入非隔离反激转换器参考设计DER-578主要特性,电路图,材料清单和PCB设计图.

LinkSwitch™-XT2 incorporates a 725 V power MOSFET, oscillator, simple ON/OFF control scheme, a high-voltage switched current source, frequency jittering, cycle-by-cycle current limit and thermal shutdown circuitry onto a monolithic IC. The start-up and operating power are derived directly from the DRAIN pin, eliminating the need for a bias winding and associated circuitry.

LNK3604产品亮点:

Easy to Design

Lowest component count switcher solution

Selectable device current limit

Fully integrated auto-restart for short-circuit and open-loop protection

Optional self-biased supply

Frequency jittering greatly reduces EMI

Meets HV creepage requirements between DRAIN and all other pins both on the PCB and at the package

Pin-out simplifies PCB heat sinking

Features Superior to Linear/RCC

Output overvoltage protection (OVP)

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