原标题：基于ON NCP1340+NCP43080的40W高输出电流充电器方案

　　ON Semiconductor推出全电压输入、5V输出高电流的手机电源适配器方案，输出功率40W，全电压满载效率超过90%，待机功耗低于30 mW，PCB尺寸仅40mmx40mmx21mm，功率密度达1.25W/cm3。另外，该方案还提供完整的保护机制，包含输出过电流、输出短路、过温、开回路与Burn-out等保护。

　　本案采用ON Semiconductor NCP1340+NCP43080的解决方案，以达到高效率、低待机功耗与完整保护要求。NCP1340是高频准谐振电流模式控制PWM IC，它集成X2电容放电、谷底闭锁、Quiet-Skip等新颖技术。并搭配NCP43080同步整流IC，NCP43080可应用于LLC、Forward或DCM/CRM/QR的Flyback，它集成二次侧零电流侦测、轻载关闭模式、最大1MHz操作频率与8A-Sink/4A-Source电流等新颖技术。

　　场景应用图

　　展示板照片

　　方案方块图

　　核心技术优势

　　1. 低待机功耗 < 30mW

　　2. 提供高压启动与X2电容放电回路

　　3. 具有Quiet skip mode功能

　　4. 可设置最大操作频率

　　方案规格

　　1. 全电压输入: 90Vac~264Vac

　　2. 最大输出功率: 5.25V/8A

　　3. 高效率 >90% @full load

　　4. 具有过电压保护、过电流保护、短路保护、开回路保护与过温保护

　　技术文档

　　【NCP1340】

　　产品信息

　　The NCP1340 is a highly integrated quasi−resonant flyback controller suitable for designing high−performance off−line power converters. With an integrated active X2 capacitor discharge feature, the NCP1340 can enable no−load power consumption below 30 mW. The quasi−resonant current−mode flyback stage features a proprietary valley−lockout circuitry, ensuring stable valley switching. This system works down to the 6th valley and transitions to a frequency foldback mode to reduce switching losses. As the load decreases further, the NCP1340 enters quiet−skip mode to manage the power delivery. To help ensure converter ruggedness, the NCP1340 implements several key protective features such as internal brownout detection, a non−dissipative Over Power Protection (OPP) for constant maximum output power regardless of input voltage, a latched over voltage and NTC−ready over temperature protection through a dedicated pin, and line removal detection to safely discharge the X2 capacitors when the line is removed.

　　QR Frequency Jittering

　　New Quiet-Skip Technology

　　Integrated HV Startup with Brownout Protection

　　Valley Switching Operation with Valley Lockout

　　Integrated X2 Capacitor Discharge Capability

　　NTC Compatible Fault Pin

　　High Drive Capability: -500 mA / +800 mA

　　Latch input for OVP and OTP implementations

　　卖盘型号

　　NCP1340B6DR2G

　　NCP1340B5D1R2G

　　NCP1340B4D1R2G

　　NCP1340B1DR2G

　　NCP1340A6DR2G

　　NCP1340B3D1R2G

　　【NCP43080】

　　NCP43080: 同步整流器控制器，具有LLD功能

　　The NCP43080 is a synchronous rectifier controller for switch mode power supplies. The controller enables high efficiency designs for flyback, quasi resonant flyback and LLC topologies.

　　Externally adjustable minimum off−time and on−time blanking periods provides flexibility to drive various MOSFET package types and PCB layout. A reliable and noise less operation of the SR system is insured due to the Self Synchronization feature. The NCP4308 also utilizes Kelvin connection of the driver to the MOSFET to achieve high efficiency operation at full load.

　　The precise turn−off threshold, extremely low turn−off delay time and high sink current capability of the driver allow the maximum synchronous rectification MOSFET conduction time. The high accuracy driver and 5 V gate clamp make it ideally suited for directly driving GaN devices.

　　To provide more flexibility in PCB layout there are two versions of this product.

　　NCP4308 does NOT have LLD function

　　NCP43080 has LLD function

　　特性

　　Self−Contained Control of Synchronous Rectifier in CCM, DCM and QR for Flyback or LLC Applications

　　Precise True Secondary Zero Current Detection

　　Rugged Current Sense Pin (up to 150 V)

　　Adjustable Minimum ON−Time

　　Adjustable Minimum OFF-Time with Ringing Detection

　　Adjustable Maximum ON−Time for CCM Controlling of Primary QR Controller

　　Operating Voltage Range up to VCC = 35 V

　　8 A / 4 A Peak Current Sink / Source Drive Capability

　　GaN Transistor Driving Capability (options A and C)

　　Low Startup Current Consumption

　　Maximum Operation Frequency up to 1 MHz

　　Improved Robust Self Synchronization Capability

　　These are Pb−Free Devices

　　优势

　　Robust design during power excurtion

　　Provides negligible switching losses and prolongs FET life

　　Robustness

　　Improves efficiency and design flexibility

　　Improves efficiency and design flexibility

　　Improves efficiency and design flexibility

　　Advantage with multiple Vout such as smart charging or USB-PD

　　higher drive strenght provides higher efficiency

　　GaN FET further improve efficiency and solution size

　　Improves standby power consumption

　　Provides higher OFF-ON time accuracy, thus improving efficiency

　　应用

　　Notebook Adapters

　　High Power Density AC/DC Power Supplies (Cell Phone Chargers)

　　LCD TVs

　　All SMPS with High Efficiency Requirements

　　SR for Flyback & LLC

　　终端产品

　　Notebook Adapters

　　Smartphone Chargers

　　Tablet Chargers

　　AC-DC Power Adapters

　　LCD TVs

　　Ultra High Density Adapters