TI TPS55010低功耗隔離反激電源轉(zhuǎn)換方案

1、TI TPS55010低功耗隔離反激電源轉(zhuǎn)換方案關(guān)鍵詞：電源管理,DC/DC轉(zhuǎn)換器,TI公司的TPS55010是集成了FET的3V-6V輸入隔離反激DC/DC電源轉(zhuǎn)換器,是一種變壓器驅(qū)動器,為隔離的接口如RS-485和RS-232 提供隔離的電源.電源功率達2W,開關(guān)頻率可從100 kHz到2000 kHz調(diào)整,具有逐個周期的限流特性,主要用在隔離的RS-485/RS-232電源,隔離的CAN收發(fā)器,IGBT柵驅(qū)動器的浮電源,電源自動化控制,工業(yè)過程控制,隔離的數(shù)據(jù)采集以及通信接口等.本文介紹了TPS55010主要特性,以及應用電路,低功耗絕緣反激轉(zhuǎn)換器TPS55010EVM-009主要特性,

2、 性能指標和電路圖,材料清單, PCB布局圖.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應用: 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圖1.TPS55010簡化電路圖TPS55010EVM-009低功耗絕緣反激轉(zhuǎn)換器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 圖2.TPS55010EVM-00