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基于TI公司的TPS54A20小型两相降压电源转换解决方案

来源: 中电网
2018-12-07
类别:工业控制
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文章创建人 拍明芯城

原标题:TI TPS54A20小型两相降压电源转换解决方案

  TI公司的TPS54A20是两相同步降压电源转换器,两相电流具有自动平衡功能,具有较低的开关损耗,可工作在较高的开关频率,每相的开关频率2-MHz到5-MHz,开通时间14ns,输入电压12V,输出电压0.51-V到 2-V,主要用在通信,基站设备,存储.SSD.DDR存储器,开关,集线器,路由器和其它网络设备以及小型背板安装电源(高度小于2mm).本文介绍了TPS54A20主要特性,框图和应用电路,以及评估板PMP11438主要特性,电路图和材料清单.

  The TPS54A20 is a two-phase, synchronous series capacitor buck converter designed for small size, low voltage applications from a 12-V input rail. This topology uniquely merges a switched capacitor circuit with a two phase buck converter. Advantages include automatic current balancing between the inductors, lower switching losses which enable high frequency (HF) operation, and voltage step-down through the series capacitor. Small, low profile inductors used with the TPS54A20 significantly reduce total solution area and height. An adaptive on-time control architecture provides fast transient response and accurate voltage regulation at up to 10-MHz operating frequency. Fixed frequency operation during steady state is maintained through the use of a phase lock loop (PLL) to lock switching signals to a reference oscillator.

  TPS54A20主要特性:

  Two-phase, Synchronous Series Capacitor Buck Converter

  Automatic Current Balancing Between Phases

  2-MHz to 5-MHz Per Phase Switching Frequency

  14-ns Minimum On-Time

  0.51-V to 2-V Output Voltage Range with ±0.5% Feedback Reference Voltage

  Input Overvoltage Lockout for 17-V Surge Protection

  Adjustable Current Limit with Auto Restart (Hiccup)

  Synchronizes to an External Clock

  Fixed Frequency in Steady State

  Adaptive On-Time Control

  Internal Feedback Loop Compensation

  Internal Gate Drive LDO with External Supply Option

  EN Pin Allowing for Adjustable Input UVLO

  Selectable Soft-Start Time

  Monotonic Startup with Pre-biased Output

  Output Power Good Indicator (Open Drain)

  Output Overvoltage/Undervoltage Protection

  TPS54A20应用终端设备:

  Telecom, base station, and communications equipment

  Storage, SSD, DDR memory, switches, hubs, routers, and other networking equipment

  Low profile/Backside board mounting (< 2 mm height)

  图1.TPS54A20框图

  图2.TPS54A20典型应用电路

  评估板PMP11438

  PMP11438 is a vehicle used to compare three different power solutions for converting a 12V bus to 1.2V at 6-10A. The 1.2V output voltage is applicable to DDR4 memory applications. Each solution offers an advantage in either full load efficiency, light load efficiency, density, height, transient response, or some combination of these.

  评估板PMP11438主要特性:

  Two 1.2V/10A power converters and one 1.2V/6A converter

  Switched-capacitor buck converter, multi-phase buck converter, and single POL buck converter

  Light-Load efficiency available in all solutions

  Solutions with sub 2mm height

  On-board transient testers for controlled, high slew rate transient loads

  图3.评估板PMP11438外形图

  图4.评估板PMP11438电路图(1)

  图5.评估板PMP11438电路图(2)

  评估板PMP11438材料清单:

责任编辑:HanFeng

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