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Texas Instruments LM5166EVM-C50A Evaluation Module (EVM)

Texas Instruments LM5166EVM-C50A Evaluation Module (EVM) is designed to showcase the performance and all features of the LM5166. The LM5166 is a wide-VIN, synchronous buck converter with an ultra-low no-load supply current. The design is packaged in a tiny footprint with a low component count. It operates over a wide input voltage range of 6V to 65V to deliver a fixed 5V output with better than 2% setpoint accuracy. Low dropout performance whenever the input voltage decreases below the output voltage setpoint is available with 100% duty cycle conduction of the high-side MOSFET. Under the Texas Instruments LM5166's constant-on-time (COT) control scheme and diode emulation, the no-load supply current is only 14μA at a 24V input.

Features

  • 6V to 65V input voltage range
  • Ultra-high power conversion efficiency: > 90% at an output of 5V and above 1mA load (input voltage 12V)
  • 5V target output voltage
  • COT or PFM control architecture
  • No-load supply current as low as 12µA

Required Equipment

  • 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

Mechanical Drawing - Texas Instruments LM5166EVM-C50A Evaluation Module (EVM)

Related Product

Texas Instruments LM5166 Synchronous Buck Converter

Compact, easy-to-use with high efficiency over wide input voltage and load current ranges. 

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Published: 2017-02-07 | Updated: 2022-03-23