原标题：TI UCC28710输出28V 350W电源参考设计

　　TI公司的ucc28710是反激电源控制器,不需要光耦提供隔离的恒压(CV)和恒流(CC)输出,内部集成了700V起动开关,动态控制工作状态,支持超低待机功耗, UCC28710系列中的控制算法使得工作效率满足或超过设备所需标准,最大工作效率100kHz,主要用于AC/DC电源,洗衣机和烘干机,电子仪表,智能手机,消费和烟雾检测,冰箱,太阳能逆变器,电路中断器,电动自行车,温度调温器,照明,服务器电源,多媒体电源等.本文介绍了UCC28710主要特性,框图, 简化反激转换器电路以及通用输入28V输出350W电源PSU参考设计主要特性,电路图和材料清单.

　　The UCC28710 family of flyback power supply controllers provides isolated-output Constant-Voltage (CV) and Constant-Current (CC) output regulation without the use of an optical coupler. The devices process information from the primary power switch and an auxiliary flyback winding for precise control of output voltage and current.

　　An internal 700-V start-up switch, dynamically-controlled operating states and a tailored modulation profile support ultra-low standby power without sacrificing start-up time or output transient response.

　　Control algorithms in the UCC28710 family allow operating efficiencies to meet or exceed applicable standards. The output drive interfaces to a MOSFET power switch. Discontinuous conduction mode (DCM) with valley switching reduces switching losses. Modulation of switching frequency and primary current peak amplitude (FM and AM) keeps the conversion efficiency high across the entire load and line ranges.

　　The controllers have a maximum switching frequency of 100 kHz and always maintain control of the peak-primary current in the transformer. Protection features help keep primary and secondary component stresses in check. The UCC28710, UCC28714 and UCC28715 allow the cable compensation to be programmed. The UCC28711, UCC28712 and UCC28713 devices allow remote temperature sensing using a negative temperature coefficient (NTC) resistor while providing fixed cable-compensation levels.

　　UCC28710主要特性:

　　< 10-mW No-Load Power

　　Primary-Side Regulation (PSR) Eliminates Opto-Coupler

　　±5% Voltage and Current Regulation Across Line and Load

　　700-V Start-Up Switch

　　100-kHz Maximum Switching Frequency Enables High-Power Density Charger Designs

　　Quasi-Resonant Valley-Switching Operation for Highest Overall Efficiency

　　Frequency Jitter to Ease EMI Compliance

　　Wide VDD Range Allows Small Bias Capacitor

　　Clamped Gate-Drive Output for MOSFET

　　Overvoltage, Low-Line, and Overcurrent Protection Functions

　　Programmable Cable Compensation (UCC28710, UCC28714 and UCC28715)

　　NTC Resistor Interface (UCC28711, UCC28712 and UCC28713) with Fixed Cable Compensation Options

　　SOIC-7 Package

　　UCC28710主要应用:

　　AC/DC Power Supply - Dual Analog Controller

　　Clothes Washer & Dryer

　　Electricity Meters

　　Fire and Smoke Detection

　　Handset: Smartphone

　　Lighting: Down Light & Low Bay

　　Microwave Oven

　　Power Supply: AC/DC, Isolated, w/ PFC, > 90W

　　Refrigerator

　　Solar Inverters

　　Thermostat

　　Circuit Breakers

　　E-Bike

　　Fault Passage Indicator

　　HVAC

　　Industrial Monitor

　　Lighting: Streetlight, AreaLight, HighBay & MidBay

　　Power Supply: AC/DC, Isolated, no PFC, < 90W

　　Protection Relay

　　Server: PSU

　　Tablet: Multimedia

　　Washing Machine: Low-End

　　图1. UCC28710框图

　　图2. UCC28710简化应用电路

　　图3. UCC28710简化反激转换器电路

　　通用输入28V输出350W电源PSU参考设计

　　High efficiency, high power factor and reliable power supply are the main focus of the PMP9531 design for motor driver applications. Transition mode (TM) power factor correction (PFC) with UCC28051 and LLC series resonant converter (SRC) with UCC25600 are applied in PMP9531. In addition, a high-side buck converter with UCC28710 is applied here as the bias supply. 93% converter efficiency is achieved at high line while still obtaining 90% converter efficiency at low line.

　　350W电源PSU参考设计主要特性:

　　Universal 85VAC-264VAC input

　　28V 350W output

　　Up to 93% converter efficiency

　　TM PFC output power goes up to 385W

　　AC-DC PSR buck for bias supply

　　图4. 350W电源PSU参考设计外形图

　　350W电源PSU参考设计材料清单: