NXP TEA1733LT GreenChip开关电源控制方案

关键词：电源管理,AC/DC转换器,开关电源,SMPS

NXP公司的TEA1733LT/N1 和TEA1733LT/N2是低成本GreenChip 开关电源（SMPS）控制器，适合用于反激拓扑。器件工作在固定频率模式，采用频率抖动来降低电磁干扰（EMI），输入电压12V-30V，起动和重起的电流非常低，只有10uA，无负载时的工作电流0.5mA，适用于75W以下的开关电源。本文介绍了TEA1733LT/N1 和TEA1733LT/N2主要特性和优势，TEA1733LT/N1 和TEA1733LT/N2方框图，典型应用电路图以及GreenChip 65 W TEA1733(L)T 演示板主要特性，电路图和材料清单（BOM）。

TEA1733LT：GreenChip SMPS control IC

The TEA1733LT/N1 and TEA1733LT/N2 are low cost Switched Mode Power Supply (SMPS) controller ICs intended for flyback topologies. They operate in fixed frequency mode. To reduce ElectroMagnetic Interference (EMI), frequency jitter has been implemented. Slope compensation is integrated for Continuous Conduction Mode (CCM) operation.

The TEA1733LT 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 TEA1733LT 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.

TEA1733LT/N1 和TEA1733LT/N2主要特性和优势：

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 μA)

Low supply current during normal operation (typically 0.5 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

TEA1733LT/N1 和TEA1733LT/N2应用：

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

75 W.

图1。TEA1733LT/N1方框图

图2。TEA1733LT/N2方框图

图3。TEA1733LT典型应用电路图（1）

图4。TEA1733LT典型应用电路图（2）

GreenChip 65 W TEA1733(L)T演示板

This 65 W TEA1733(L)T demo board demonstrates the capabilities of the

TEA1733(L)T Switched Mode Power Supply (SMPS) controller. This manual provides the specifications,schematics, and PCB layout of the 65 W TEA1733(L)T demo board. For details on the

TEA1733(L)T SMPS controller please refer to the application note and data sheet for the TEA1733(L)T.

GreenChip 65 W TEA1733(L)T演示板主要特性：

? Universal mains supply operation

? OverCurrent Protection (OCP)

? OverPower Protection (OPP)

? Low ripple and noise

? Low-cost implementation

? Low no-load standby power (< 100 mW at 230 V; 50 Hz)

? ENERGY STAR compliant

? EMI CISPR 22 compliant

图5。GreenChip 65 W TEA1733(L)T演示板电路图GreenChip 65 W TEA1733(L)T演示板材料清单（BOM）：

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