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Texas Instruments LM5166EVM-C50A评估模块 (EVM)

Texas Instruments LM5166EVM-C50A评估模块 (EVM) 旨在演示LM5166的性能和所有特性。LM5166 是一款宽 VIN 同步降压转换器，具有超低空载电源电流。该设计采用小尺寸封装，所需元件数量少。该模块在 6V 至 65V 的宽输入电压范围内工作，可提供 5V 固定输出，且设定精度优于 2%。每当输入电压降至低于输出电压设定值时，该模块将通过高侧MOSFET的100％占空比传导来提供低压差性能。凭借LM5166的恒定导通时间 (COT) 控制方案和二极管仿真，空载电源电流在输入为24V时仅为14μA。

特性

  • 输入电压范围：6V至65V
  • 目标输出电压：5V
  • 超高功率转换效率：在5V输出和超过1mA负载（输入电压为12V）时大于90％
  • COT或PFM控制架构
  • 空载电源电流低至12μA

必要设备

  • Voltage Source
    • The input voltage source VIN should be a 0–70V variable DC source capable of supplying 1A
  • Multimeters
    • Voltmeter 1
      • Input voltage at VIN to GND
      • Set the voltmeter to input impedance of 1GΩ
    • Voltmeter 2
      • Output voltage at VOUT to GND
      • Set the voltmeter to input impedance of 1GΩ
    • Ammeter 1
      • Input current
      • Set ammeter to 1-second aperture time
    • Ammeter 2
      • Output current
      • Set ammeter to 1-second aperture time
  • Electronic Load
    • The load should be an electronic constant-resistance (CR) or constant-current (CC) mode load capable of 0mADC to 750mADC at 5V
    • For a no-load input current measurement, disconnect the electronic load as it may draw a small residual current 
  • Oscilloscope
    • With the scope set to 20MHz bandwidth and AC coupling, measure the output voltage ripple directly across an output capacitor with a short ground lead normally provided with the scope probe
    • Place the oscilloscope probe tip on the positive terminal of the output capacitor, holding the probe's ground barrel through the ground lead to the capacitor's negative terminal
    • It is not recommended to use a long-leaded ground connection because this may induce additional noise given a large ground loop
    • To measure other waveforms, adjust the oscilloscope as needed

Test Setup

机械图纸 - Texas Instruments LM5166EVM-C50A评估模块 (EVM)

相关产品

Texas Instruments LM5166同步降压转换器

外形紧凑、简单易用，可在宽输入电压和负载电流范围内保持高效率。

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发布日期: 2017-02-07 | 更新日期: 2022-03-23