NXP 公司的TEA1733MT是 TEA1733系列GreenChip開關電源（SMPS）控制IC，適用于低成本反激拓撲，工作在固定頻率模式，頻率抖動降低EMI。輸入電壓12V-30V，起動和重起的電流非常低，只有10uA，無負載時的工作電流0.5mA，適用于75W以下的開關電源。本文介紹了TEA1733MT主要特性，方框圖，典型配置圖和典型應用電路圖以及TEA1733典型應用電路圖。

TEA1733MT：GreenChip SMPS control IC

The TEA1733MT is a low cost Switched Mode Power Supply (SMPS) controller IC intended for flyback topologies. It operates in fixed frequency mode. Frequency jitter has been implemented to reduce ElectroMagnetic Interference (EMI). Slope compensation is integrated for Continuous Conduction Mode (CCM) operation.

The TEA1733MT IC includes OverPower Protection (OPP). This enables the controller to operate under overpower situations for a limited amount of time.

Two pins, VINSENSE and PROTECT, are reserved for protection purposes. Input UnderVoltage Protection (UVP) and OverVoltage Protection (OVP), output OVP and OverTemperature Protection (OTP) can be implemented using a minimal number of external components.

At low power levels the primary peak current is set to 25 % of the maximum peak current and the switching frequency is reduced to limit switching losses. The combination of fixed frequency operation at high output power and frequency reduction at low output power provides high-efficiency over the total load range.

The TEA1733MT enables low-cost, highly efficient and reliable supplies for power requirements up to 75 W to be designed easily and with a minimum number of external components.

TEA1733MT主要特性：

SMPS controller IC enabling low-cost applications

Large input voltage range (12 V to 30 V)

Very low supply current during start-up and restart (typically 10 uA)

Low supply current during normal operation (typically 0.55 mA without load)

Overpower or high/low line compensation

Adjustable overpower time-out

Adjustable overpower restart timer

Fixed switching frequency with frequency jitter to reduce EMI

Frequency reduction with fixed minimum peak current to maintain high-efficiency at low output power levels

Slope compensation for CCM operation

Low and adjustable OverCurrent Protection (OCP) trip level

Adjustable soft start operation

Two protection inputs (e.g. for input UVP and OVP, OTP and output OVP)

IC overtemperature protection

TEA1733MT應用：

All applications requiring efficient and cost-effective power supply solutions up to
75 W.

圖1。TEA1733MT方框圖

圖2。TEA1733MT典型配置圖

圖3。TEA1733MT典型應用電路圖

圖4。TEA1733典型應用電路圖
詳情請見：
http://www.nxp.com/documents/data_sheet/TEA1733MT.pdf
和
http://www.nxp.com/documents/application_note/AN10868.pdf