原标题：TI TPS546C23带PMBus35A DC-DC转换器解决方案

　　TI公司的TPS546C23是PMBus 1.3兼容的非绝缘集成了FET的DC/DC转换器,具有高频工作和输出电流35A,5-mm × 7-mmLQFN封装.两个TPS546C23并联可提供70A电流.输入电压4.5V-18V,输出电压0.35V-5.5V,主要用在测试和仪表,以太网交换机,光交换机,路由器和基站,服务器,企业存储SSD和高密度电源解决方案.本文介绍了TPS546C23主要特性,功能框图,多种应用电路,以及两相70A带PMBus评估模块TPS546C23EVM2-746主要特性和电性能指标,电路图,材料清单和PCB设计图.

　　The TPS546C23 devices are PMBus 1.3 Compliant, non-isolated DC-DC converters with integrated FETs, capable of high-frequency operation and 35-A current output from a 5-mm × 7-mm package. Two TPS546C23 devices can be paralleled together to provide up to 70-A load. Current sensing is realized by sampling a small portion of the power stage current and independent on the device temperature. High-frequency, low-loss switching, provided by an integrated NexFET power stage and optimized drivers, allows for very high-density power solutions. The PMBus interface enables the AVS functions through VOUT_COMMAND, flexible converter configuration, as well as key parameters monitoring including output voltage, current, and internal die temperature. Response to fault conditions can be set to either restart, latch-off or ignore depending on system requirements.

　　TPS546C23主要特性:

　　PMBus™ 1.3 Compliant Converters: 35 A

　　2-Device Stackable for up to 70 A With Current Sharing

　　Input Voltage Range: 4.5 V to 18 V

　　Output Voltage Range: 0.35 V to 5.5 V

　　5 mm × 7 mm LQFN Package

　　Single Thermal Pad

　　Integrated 3.2-mΩ and 1.4-mΩ Stacked NexFET™ Power Stage

　　350-mV to 1650-mV Reference for Adaptive Voltage Scaling (AVS) Function and Margining through PMBus

　　0.5% Reference Accuracy at 600 mV and Above

　　Lossless Low-Side MOSFET Current Sensing

　　Voltage Mode Control With Input Feed-Forward

　　Differential Remote Sensing

　　Monotonic Start-Up into Pre-Biased Output

　　Output Voltage and Output Current Reporting

　　Internal Die Temperature Monitoring

　　64 Programmable PMBus Addresses via ADDR0 and ADDR1 Pins

　　Programmable via the PMBus Interface

　　VOUT_COMMAND and AVS VOUT Transition Rate

　　Overcurrent Protection With Thermal Compensation

　　UVLO, Soft-Start and Soft-Stop

　　PGOOD, OV, UV, OT Levels

　　Fault Responses

　　Turn-On and Turn-Off Delays

　　Thermal Shutdown

　　Pin Strapping for Switching Frequency: 200 kHz to 1 MHz

　　Frequency Synchronization to an External Clock or Output Clock to Sync Out

　　TPS546C23应用:

　　• Test and Instrumentation

　　• Ethernet Switches, Optical Switches, Routers,Base Stations

　　• Servers

　　• Enterprise Storage SSD

　　• High-Density Power Solutions

　　图1.TPS546C23功能框图

　　图2.TPS546C23两相应用电图

　　图3.TPS546C23用电路图:4.5V-18V输入,1V/35A输出转换器

　　两相70A带PMBus评估模块TPS546C23EVM2-746

　　The TPS546C23EVM2-746 evaluation module (EVM) is a two phase buck converter with two TPS546C23devices. The TPS546C23 device is a stackable synchronous buck with PMBus interface that can operatefrom a nominal 4.5-V to 18-V supply. The device allows programming and monitoring via the PMBusinterface.

　　Two TPS546C23 devices are configured as two phase buck converter in factory default, output current isevenly distributed in the two devices; both the negative and positive output terminals are connectedtogether.

　　评估模块TPS546C23EVM2-746主要特性:

　　• Regulated 1.2-V output up to 70-A DC steady-state output current

　　• The output voltage is marginable and trimmable via the PMBus interface

　　– Programmable UVLO, soft-start, and enable via the PMBus interface

　　– Programmable overcurrent warning and fault limits and programmable response to faults via thePMBus interface

　　– Programmable overvoltage and undervoltage warning and fault limits and programmable response

　　to faults via the PMBus interface

　　– Programmable turn-on and turn-off delays

　　• Convenient test points for probing critical waveforms

　　评估模块TPS546C23EVM2-746典型应用:

　　• High-density power solutions

　　• Wireless infrastructure

　　• Switcher

　　• Router Network

　　• Server

　　• Storage

　　• Smart power systems

　　图4.评估模块TPS546C23EVM2-746外形和测试图

　　评估模块TPS546C23EVM2-746电性能指标:

　　评估模块TPS546C23EVM2-746材料清单:

　　详情请见:

tps546c23.pdf

sluubh5.pdf