原标题：Powerint LNK616 5W充电器参考设计

　　powerint 公司的RD158是采用LinkSwitch-II LNK616的5W充电器参考设计,主要用在无绳电话,手机,PDA,MP3/手提音频设备,适配器,LED驱动器等. LinkSwitch-II系列能极大地简化低功耗CV/CC充电器的设计,它不需要光耦和次级控制电路. LinkSwitch-II系列集成了700V功率MOSFET,新颖的开/关控制状态机,用于自偏置的高压开关电流源,频率抖动器,逐个周期的限流以及滞后的热关断电路.本文介绍了LinkSwitch-II的主要特性,方框图以及应用电路和不需要偏置电源的LinkSwitch-II反激电源电路.同时还介绍了采用LNK616PG的5W充电器参考设计的主要特性,详细电路图和材料清单(BOM).

　　The LinkSwitch-II dramatically simplifies low power CV/CC charger designs by eliminating an optocoupler and secondary control circuitry. The device introduces a revolutionary control technique to provide very tight output voltage and current regulation, compensating for transformer and internal parameter tolerances along with input voltage variations.

　　The device incorporates a 700 V power MOSFET, a novel On/Off control state machine, a high voltage switched current source for self biasing, frequency jittering, cycle-by-cycle current limit and hysteretic thermal shutdown circuitry onto a monolithic IC.

　　LinkSwitch-II 系列亮点:

　　Dramatically Simplifi es CV/CC Converters

　　Eliminates Optocoupler and all secondary CV/CC control circuitry

　　Eliminates all control loop compensation circuitry

　　Advanced Performance Features

　　Compensates for transformer inductance tolerances

　　Compensates for input line voltage variations

　　Compensates for cable voltage drop (LNK61X series)

　　Compensates for external component temperature variations

　　Very tight IC parameter tolerances using proprietary trimming technology

　　Frequency jittering greatly reduces EMI filter cost

　　Even tighter output tolerances achievable with external resistor selection/trimming

　　Advanced Protection/Safety Features

　　Auto-restart protection reduces power delivered by >95% for output short circuit and control loop faults (open and shorted components)

　　Hysteretic thermal shutdown – automatic recovery reduces power supply returns from the field

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

　　EcoSmart – Energy Effi cient

　　Easily meets all global energy efficiency regulations

　　No-load consumption <200 mW at 230 VAC and down to below 30 mW with optional external bias

　　On/Off control provides constant efficiency down to very light loads – ideal for CEC and ENERGY STAR 2.0 regulations

　　No current sense resistors – maximizes efficiency

　　Green Package

　　Halogen free and RoHS compliant package

　　应用:

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

　　图1.LNK616功能方框图

　　图2.LNK616应用案例

　　图2.LinkSwitch-II反激电源,不需要偏置电源

　　采用LNK616PG的5W充电器参考设计

　　主要特性:

　　Revolutionary control concept provides very low cost, low part-count solution

　　Primary-side control eliminates secondary-side control and optocoupler

　　Provides ±5% constant voltage (CV) and ±10% constant current (CC) accuracy

　　including output cable drop compensation for 26 AWG (0.49 _) or 24 AWG (0.3 _)cables

　　_ Over-temperature protection – tight tolerance (±5%) with hysteretic recovery for safe PCB temperatures under all conditions

　　_ Auto-restart output short circuit and open-loop protection

　　_ Extended pin creepage distance for reliable operation in humid environments –

　　>3.2 mm at package

　　EcoSmart® – Easily meets all current international energy efficiency standards – China

　　(CECP) / CEC / ENERGY STAR 2 / EU CoC

　　_No-load consumption <50 mW at 230 VAC

　　_Ultra-low leakage current: <5 μA at 265 VAC input (no Y capacitor required)

　　_Design easily passes EN550022 and CISPR-22 Class B EMI testing with >10 dB

　　margin

　　Meets IEC 61000-4-5 Class 3 AC line surge

　　Meets IEC 61000-4-2 ESD withstand (contact and air discharge to ±15 kV)

　　图3.参考设计RD158 电路图

　　参考设计RD158材料清单(BOM):