原标题：PowerInt LNK4023D 10W USB充电器参考设计

　　PowerInt公司的LinkSwitchTM-4系列产品是恒压/恒流初级侧调节(PSR)开关IC,由于不需要光耦合器和此级控制电路从而大大地简化了低功耗CV/CC充电器的设计.器件采用PW/PFM控制器是效率最大化,满足无负载时功耗小于30W的要求,主要用于手机/无绳电话充电器,PDA,MP3/手持音频设备充电器和适配器等.本文介绍了LinkSwitchTM-4系列产品亮点,功能框图, 通用输入10W充电器电路图以及采用LinkSwitchTM-4 LNK4023D 10W CV/CC USB充电器参考设计(RDR-462)主要指标,电路图,材料清单和PCB设计图.

　　The LinkSwitchTM-4 family of ICs dramatically simplifies low power CV/CC charger design by eliminating an optocoupler and secondary control circuitry. The LinkSwitch-4 family adaptive BJT drive technology uses combined base and emitter switching to boost switching performance and deliver higher efficiency, wider Reverse Bias Safe Operating Area (RBSOA) margin and the flexibility to accommodate a wide range of low cost BJT. The device incorporates a multimode PWM/PFM controller with quasi resonant switch to maximize the efficiency, meet <30 mW no-load and at same time maintain fast transient response greater than 4.3 V with a load change from 0% to 100%.

　　LinkSwitchTM-4系列产品亮点:

　　Dramatically Simplifies CV/CC Converters

　　Eliminates optocoupler and all secondary CV/CC control circuitry

　　Eliminates all control loop compensation circuitry

　　Advanced Performance Features

　　Dynamic base drive technology provides flexibility in choice of BJT transistor by dynamically optimizing BJT switching characteristics Extends RBSOA of BJT

　　Dramatically reduces sensitivity to BJT gain

　　Compensates for transformer inductance tolerances

　　Compensates for input line voltage variations

　　Compensates for cable voltage drop

　　Compensates for external component temperature variations

　　Very accurate IC parameter tolerances using proprietary trimming technology

　　Frequency up to 65 kHz to reduce transformer size

　　The minimum peak current is fixed to improve transient load response

　　Advanced Protection/Safety Features

　　Single fault output overvoltage and short-circuit

　　EcoSmart™– Energy Efficient

　　Meets DoE 6 and CoC V5 2016 via an optimized quasi-resonant switching PWM/PFM control

　　No-load consumption of <30 mW at 230 VAC input

　　Green Package

　　Halogen free and RoHS compliant package

　　LinkSwitchTM-4系列应用:

　　Chargers for cell/cordless phones, PDAs, MP3/portable audio devices, adapters, etc.

　　图1. LinkSwitchTM-4系列LNK40x2S功能框图

　　图2. LinkSwitchTM-4系列LNK40x3D功能框图

　　图3. LinkSwitchTM-4系列典型通用输入10W充电器电路图

　　采用LinkSwitchTM-4 LNK4023D 10W CV/CC USB充电器参考设计(RDR-462)

　　This document is an engineering report describing a 2 A, 5.0 V USB charger utilizing a device from the LinkSwitch-4 family of ICs. This design is intended to show the high power density and efficiency that is possible due to the high level of integration while still providing exceptional performance.

　　This document contains the power supply specification, schematic, bill of materials, transformer documentation, printed circuit layout, and performance data.

　　10W CV/CC USB充电器参考设计(RDR-462)主要特性:

　　 LinkSwitch-4

　　 Primary side regulated (no optocoupler)

　　 ±3% CV, ±5% CC regulation

　　 Transient response independent of load timing

　　 <30 mW no-load input power

　　 Cable voltage drop compensation

　　图4. 10W CV/CC USB充电器参考设计(RDR-462)外形图(顶视)

　　图5. 10W CV/CC USB充电器参考设计(RDR-462)外形图(底视)

　　10W CV/CC USB充电器参考设计(RDR-462)主要指标:

　　图6. 10W CV/CC USB充电器参考设计(RDR-462)电路图

　　10W CV/CC USB充电器参考设计(RDR-462)材料清单: