原标题：NXP TEA1753T GreenChip III开关电源控制方案

　　nxp公司的TEA1753T是第三代 GreenChip III开关电源(SMPS)控制器,它集成了功率因素修正(PFC)控制器和反激控制器, 通用火线电压70 VAC到276 VAC,内建的绿色功能在各个功率等级都实现了高效率:大功率时采用准谐振工作,低功率时采用降频工作,并把PFC关断,以获得高效率.主要用在250W 的高削低成本电源,特别是笔记本电脑适配器.本文介绍了TEA1753T主要特性和优势,方框图, 典型配置图和典型应用框图.

　　The GreenChip III is the third generation of green Switched Mode Power Supply (SMPS) controller ICs. The TEA1753T combines a controller for Power Factor Correction (PFC) and a flyback controller. Its high level of integration allows the design of a cost-effective power supply with a very low number of external components.

　　The special built-in green functions provide high efficiency at all power levels. This applies to quasi-resonant operation at high power levels, quasi-resonant operation with valley skipping, as well as to reduced frequency operation at lower power levels. At low power levels, the PFC switches off to maintain high efficiency.

　　During low power conditions, the flyback controller switches to frequency reduction mode and limits the peak current to an adjustable minimum value. This will ensure high efficiency at low power and good standby power performance while minimizing audible noise from the transformer.

　　For no-load operation, the controller can be switched to the power down mode. In this mode the controller is shutdown for very low standby power applications.

　　The TEA1753T is a MultiChip Module, (MCM), containing 2 chips. The proprietary high voltage BCD800 process which makes direct start-up possible from the rectified universal mains voltage in an effective and green way. The second low voltage Silicon On Insulator (SOI) is used for accurate, high speed protection functions and control.

　　The TEA1753T enables highly efficient and reliable supplies with power requirements of up to 250 W to be designed easily and with a minimum number of external components. Remark: It should be noted that all values provided throughout the running text, are typical values unless otherwise stated.

　　TEA1753T主要特性和优势:

　　1. Distinctive features

　　Integrated PFC and flyback controller

　　Universal mains supply operation (70 V AC to 276 V AC)

　　Dual boost PFC with accurate maximum output voltage (NXP patented)

　　High level of integration, resulting in a very low external component count and a cost-effective design

　　Adjustable PFC switch-off delay

　　2. Green features

　　On-chip start-up current source

　　Power down functionality for very low standby power

　　3. PFC green features

　　Valley/zero voltage switching for minimum switching losses (NXP patented)

　　Frequency limitation to reduce switching losses

　　PFC is switched off when a low load is detected at the flyback output

　　4. Flyback green features

　　Valley switching for minimum switching losses (NXP patented)

　　Frequency reduction with adjustable minimum peak current at low power operation to

　　maintain high efficiency at low output power levels

　　5. Protection features

　　Safe restart mode for system fault conditions

　　Continuous mode protection by means of demagnetization detection for both converters (NXP patented)

　　UnderVoltage Protection (UVP) (foldback during overload)

　　Accurate OverVoltage Protection (OVP) for both converters (adjustable for flyback converter)

　　Mains voltage independent OverPower Protection (OPP)

　　Open control loop protection for both converters. The open-loop protection on the

　　flyback converter is a safe restart on the TEA1753T

　　IC OverTemperature Protection (OTP)

　　Low and adjustable OverCurrent Protection (OCP) trip level for both converters

　　General purpose input for latched protection, e.g. to be used for system Over Temperature Protection (OTP)

　　TEA1753T应用:

　　The device can be used in all applications that require an efficient and cost-effective

　　power supply solution for up to 250 W. Notebook adapters in particular can benefit

　　from the high level of integration

　　图1.TEA1753T方框图

　　图2.TEA1753T典型配置图

　　图3.TEA1753T典型应用框图