原标题：基于ON NCP1399的电流型LLC-150W电源解决方案

　　该方案采用安森美半导体的LLC-NCP1399，同步整流驱动芯片NCP4305，而NCP1399是业界首款采用电流控制模式的LLC AC-DC控制IC。输入85-260VAC输出DC19.5V7A,主要驱动器件应用600V门极驱动器简化布局并减少外部组件数，采用跳周期模式提升轻载能效，并集成一系列保护特性以提升系统可靠性，用于大屏幕电视、一体化计算机、工业及医疗等大功率电源系统应用，可显著实现轻载和满载时的高能效及超低待机能耗。

　　场景应用图

　　展示板照片

　　方案方块图

　　核心技术优势

　　Onsmei 业界首款LLC电流模式控制器NCP1399.解决了LLC控制器单纯的电压变频模式的不足。

　　•从20 kHz到750 kHz的高频操作

　　•电流模式控制方案

　　•具有最大死区时间夹的自动死区时间

　　•快速共振罐稳定的专用启动顺序

　　•改善轻载效率的跳过模式操作

　　•非常低空载功耗的脱模操作

　　•锁定或自动恢复超载保护

　　•锁存或自动恢复输出短路保护

　　•严重故障条件的锁存输入，例如 OVP或OTP

　　•超出共振切换保护

　　•打开反馈回路保护

　　•精确的欠压保护

　　•根据负载条件进行PFC级运行控制

　　•具有极低泄漏电流的启动电流源

　　•在离模或故障模式下的动态自供电(DSS)操作

　　•引脚相邻引脚/打开引脚故障安全

　　方案规格

　　1、正常情况下空载功耗小于130mW

　　2、在输入85Vac - 260Vac的情况下输出带电压19.5V电流 3--7A的负载下,纹波小与150MV

　　3、在输入110Vac - 230Vac的情况下带电压19.5V电流大于2A的负载下,效率可以达到94%

　　4、自带X电容放电功能，OCP. OVP. OTP功能

　　5、LLC芯片自带PFC供电功能，更好的防止开机瞬间带来的过冲问题!

　　技术文档

　　NCP1399: Current Mode Resonant Controller (Integrated High Voltage Drivers, High Performance)

　　he NCP1399 is a high performance current mode controller for half bridge resonant converters. This controller implements 600 V gate drivers, simplifying layout and reducing external component count. The built−in Brown−Out input function eases implementation of the controller in all applications. In applications where a PFC front stage is needed, the NCP1399 features a dedicated output to drive the PFC controller. This feature together with dedicated skip mode technique further improves light load efficiency of the whole application. The NCP1399 provides a suite of protection features allowing safe operation in any application. This includes: overload protection, over−current protection to prevent hard switching cycles, brown−out detection, open optocoupler detection, automatic dead−time adjust, overvoltage (OVP) and overtemperature (OTP) protections.

　　特性

　　High−Frequency Operation from 20 kHz up to 750 kHz

　　Current Mode Control Scheme

　　Automatic Dead−time with Maximum Dead−time Clamp

　　优势

　　Optimize for physical size or highest efficiency

　　Built-in safety protection, improved transient response

　　Improved efficiency

　　应用

　　High power AC/DC adapters for notebooks

　　Offline battery chargers

　　Industrial and medical power sources

　　Computing power supplies

　　终端产品

　　Notebook Adapters

　　LCD-TV / LED-TV

　　NCP4305: 次级端同步整流驱动器用于高能效SMPS拓扑

　　The NCP4305 is high performance driver tailored to control a synchronous rectification MOSFET in switch mode power supplies. Thanks to its high performance drivers and versatility, it can be used in various topologies such as DCM or CCM flyback, quasi resonant flyback, forward, and half bridge resonant LLC.

　　The combination of externally adjustable minimum off-time and on-time blanking periods helps to fight the ringing induced by the PCB layout and other parasitic elements. A reliable and noise less operation of the SR system is insured due to the Self Synchronization feature. The NCP4305 also utilizes Kelvin connection of the driver to the MOSFET to achieve high efficiency operation at full load and utilizes a light load detection architecture to achieve high efficiency at light 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 and enables maximum SMPS efficiency. The high accuracy driver and 5 V gate clamp enables the use of GaN MOSFETs.

　　特性

　　Precise True Secondary Zero Current Detection with Adjustable Threshold

　　Typically 20 ns Turn off Delay from Current Sense Input to Driver

　　Zero Current Detection Pin Capability up to 200 V

　　Optional Ultrafast (7ns) Trigger Input

　　Disable Input

　　Adjustable Minimum ON Time and Minimum OFF Time

　　Self Synchronization

　　8 A Sink, 4 A Source Drive capability

　　Light Load Detection with Modulated Gate Drive

　　4.5 V & 9 V UVLO Options and 36 V(Max)

　　优势

　　Allows for proper timing of SR MOSFET turn on and turn off

　　Maximizes conduction time of the MOSFET to increase efficiency

　　Allows direct connection of CS input to MOSFET drain in flyback applications

　　Improves performance for applications working in deep CCM

　　Enters the IC into a low consumption standby mode

　　Prevents accidental MOSFET turn on or turn off due to ringing

　　Ensures proper DRV pulses during operation

　　Fast turn off of MOSFET for optimized conduction period

　　Increased stability coming in and out of Light Load

　　Wide output operating voltages

　　应用

　　High Power Density AC/DC Power Supplies

　　终端产品

　　Notebook Adapters

　　Server Power Supplies

　　ATX & All-in-one Power Supplies

　　High Density USB Adapters