General description

The TEA1751T is the third generation of green Switched Mode Power Supply (SMPS)

controller ICs. The TEA1751T 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

efficiency applies to quasi-resonant operation at high-power levels, quasi-resonant

operation with valley skipping, as well as 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 25 of its maximum value. This mode ensures high

efficiency at low-power and good standby power performance while minimizing audible

noise from the transformer.

The TEA1751T is a Multi-Chip Module, (MCM), containing two 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 TEA1751T enables the design of highly efficient and reliable supplies with power

requirements of up to 250 W using the minimum number of external components.

Remark: All values provided throughout this data sheet are typical values unless

otherwise stated.

Features and benefits

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

Green features

On-chip start-up current source

PFC green features

Valley/Zero Voltage Switching (ZVS) 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

Flyback green features

Valley switching for minimum switching losses (NXP patented)

Frequency reduction with fixed minimum peak current at low-power operation to

maintain high efficiency at low output power levels

Protection features

Safe restart mode for system fault conditions

Continuous mode protection with 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 safe restart

OverTemperature Protection (OTP)

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

General-purpose input for latched protection to provide system OverTemperature

Protection (OTP) for example

TEA1751T属于集成电路（IC） > AC DC 转换器，离线开关。恩智浦半导体公司制造生产的TEA1751TAC DC 转换器，离线开关该系列是元器件级控制产品，用于构建将交流市电转换为直流电（通常电压大幅降低）的设备。集成和未集成系统主要开关元件的器件均包括在内。由于高输入输出电压比，以及此类系统中通常需要隔离，这些器件通常与外部变压器配合使用。尽管通常使用定制变压器来实现此用途，但也有许多专门用于此用途的库存产品，请参见“开关转换器，SMPS 变压器”标题。