[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)

Input overvoltage line protection (OVL)

Hysteretic over-temperature protection (OTP)

Extended creepage between DRAIN pin and all other pins improves field reliability

725 V MOSFET rating for excellent surge withstand

Extremely low component count enhances reliability Allows single-sided PCB and full SMD manufacturability

EcoSmart™ – Extremely Energy-Efficient

Easily meets all global energy efficiency regulations

No-load consumption <100 mW without bias winding at 265 VAC input (<10 mW with bias winding)

ON/OFF control provides constant efficiency to very light loads

LNK3604应用:

Supplies for appliances, industrial systems, and metering

图1.LNK3604功能框图

图2.LNK3604通用输入设计电路

2.5W通用输入非隔离反激转换器参考设计DER-578

2.5W参考设计DER-578主要特性:

· Lowest component count for a non-isolated flyback solution

· Output voltage regulation, ±5%

· Programmable current limit for clampless design

· Reduced dissipation during output short circuit fault

· <10 mW no-load input power at 230 VAC

· >75% Efficiency at full load condition

· >6 dB conducted EMI margin

This engineering report describes a non-isolated flyback converter designed to provide a

nominal output voltage of 5 V at 500 mA load from a wide input voltage range of 85 VAC

to 265 VAC. This adapter utilizes the LNK3604D from the LinkSwitchTM-XT2 family of

devices.

图3.2.5W参考设计DER-578外形图(顶视图)

图4.2.5W参考设计DER-578外形图(底视图)

2.5W参考设计DER-578主要指标:

图5.2.5W参考设计DER-578电路图

2.5W参考设计DER-578材料清单:

图6.2.5W参考设计DER-578 PCB设计图(顶层)

图7.2.5W参考设计DER-578 PCB设计图(底层)

图8.2.5W参考设计DER-578变压器电路图

详情请见:

ac-dc.power.com/design-support/product-documents/data-sheets/linkswitch-xt2-data-sheet/">https://ac-dc.power.com/design-support/product-documents/data-sheets/linkswitch-xt2-data-sheet/

和

https://ac-dc.power.com/design-support/reference-designs/design-examples/der-578-25-w-universal-input-non-isolated/

der578.pdf

linkswitch-xt2_family_datasheet.pdf