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...