TI TPS55010低功耗隔离反激电源转换方案

1、TI TPS55010低功耗隔离反激电源转换方案关键词：电源管理,DC/DC转换器,TI公司的TPS55010是集成了FET的3V-6V输入隔离反激DC/DC电源转换器,是一种变压器驱动器,为隔离的接口如RS-485和RS-232 提供隔离的电源.电源功率达2W,开关频率可从100 kHz到2000 kHz调整,具有逐个周期的限流特性,主要用在隔离的RS-485/RS-232电源,隔离的CAN收发器,IGBT栅驱动器的浮电源,电源自动化控制,工业过程控制,隔离的数据采集以及通信接口等.本文介绍了TPS55010主要特性,以及应用电路,低功耗绝缘反激转换器TPS55010EVM-009主要特性,

2、 性能指标和电路图,材料清单, PCB布局图.The TPS55010 is a transformer driver designed to provide isolated power for isolated interfaces, such as RS-485 and RS-232, from 3.3V or 5V input supply.The device uses fixed frequency current mode control and half bridge power stage with primary side feedback to regulate the

3、output voltage for power levels up to 2W. The switching frequency is adjustable from 100 kHz to 2000 kHz so solution size, efficiency and noise can be traded off. The switching frequency is set with a resistor or is synchronized to external clock using the RT/CLK pin. To minimize inrush currents, a

4、small capacitor is connected to the SS pin. The EN pin is used as an enable pin or to increase the default input UVLO voltage from 2.6V.The TPS55010 is available in a 16 pin QFN with thermal pad that provides a thermally enhanced.TPS55010主要特性:Isolated Flybuck TopologyPrimary Side Feedback100 kHz to

5、2000 kHz Switching FrequencySynchronizes to External ClockAdjustable Slow StartAdjustable Input Voltage UVLOOpen Drain Fault OutputCycle-by-Cycle Current LimitThermal Shutdown Protection3mm×3mm 16 Pin QFN PackageTPS55010应用: Isolated RS-485/RS-232 Power SupplyIsolated CAN transceiversFloati

6、ng Supply for IGBT Gate DriverPower Automation ControlIndustrial Process ControlIsolated Data AcquisitionBridge Ground DifferentialNoise-Immunity Communications Interface图1.TPS55010简化电路图TPS55010EVM-009低功耗绝缘反激转换器The TPS55010EVM-009 is a fully assembled and tested circuit for evaluating the TPS55010 I

7、solated DC/DC Converter with Integrated FETs. The TPS55010EVM-009 uses fixed frequency current mode control and a half bridge power stage with primary side feedback to regulate the output voltage for power levels up to 2W.TPS55010EVM-009主要特性:Isolated Flybuck TopologyPrimary Side Feedback100 kHz to 2000 kHz Switching FrequencySynchronizes to External ClockAdjustable Slow StartAdjustable Input Voltage UVLOOpen Drain Fault OutputCycle-by-Cycle Current LimitThermal Shutdown Protection3mm×3mm 16-Pin QFN Package 图2.TPS55010EVM-00