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):
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