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Texas Instruments LM5157EVM-BST Converter Evaluation Module (EVM)

Texas Instruments LM5157EVM-BST Converter Evaluation Module (EVM) showcases the features and performance of the LM5157. The Texas Instruments LM5157 is a wide input voltage boost converter with a dual random spread spectrum. The standard configuration is designed to provide a regulated output of 12V at 1.6A from an input of 3V to 9V (load derated by half from < 6V input), switching at 2.1MHz.

Features

  • Tightly regulated output voltage of 12V with 1% accurate reference voltage
  • High conversion efficiency of > 92% at full load
  • Constant cycle-by-cycle peak inductor current limit over the input voltage range
  • Programmable hiccup mode for output overcurrent protection
  • Multiple BIAS pin and VCC pin connections to test multiple configurations
    • BIAS connect to VCC
    • BIAS supplied with external power supply
    • BIAS supplied by an output voltage
  • User-adjustable soft-start time using CSS
  • Output overvoltage protection
  • Power good (PGOOD) indicator with selectable pullup source
  • 2.1MHz Switching frequency
  • External clock synchronization
  • Programmable dual random spread spectrum reduces the EMI

Required Equipment

  • Power Supply
    • An input voltage source (VIN) should be a variable supply capable of 0V to 10V and source at least 10A
  • Multi-Meters
    • Voltmeter 1
      • Input voltage, connect from VIN+ to VIN–
    • Voltmeter 2
      • Output voltage, connect from VOUT+ to GND
    • Ammeter 1
      • Input current must be able to handle 10A
      • Shunt resistor can be used as needed
    • Ammeter 2
      • Output current must be able to handle 2A
      • Shunt resistor can be used as needed
  • Electronic Load
    • The load should be constant resistance (CR) or constant current (CC) capable
    • It should safely handle 2A at 12V
  • Oscilloscope
    • 20MHz bandwidth and AC coupling
    • Measure the output voltage ripple directly across an output capacitor with a short ground lead
    • It is not recommended to use a long-leaded ground connection due to the possibility of noise being coupled into the signal
    • To measure other waveforms, adjust the oscilloscope as needed

Test Setup

Chart - Texas Instruments LM5157EVM-BST Converter Evaluation Module (EVM)

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Texas Instruments LM5157EVM-BST Converter Evaluation Module (EVM)