NXPTEA1733LTGreenChip开关电源控制方案.docx

NXP TEA1733LT GreenChip开关电源控制方案 关键词： \o 电源管理 电源管理, \o AC/DC转换器 AC/DC转换器, \o 开关电源 开关电源, \o SMPS 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 ICThe 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 applicationsLarge 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 compensationAdjustable overpowe