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Texas Instruments LM5156HEVM-FLY Controller Evaluation Module (EVM)

Texas Instruments LM5156HEVM-FLY Controller Evaluation Module (EVM) showcases the features and performance of the LM51561-HTSSOP as a wide-input non-synchronous flyback controller. The standard configuration is designed to provide a regulated output of 5V at 4A from an input of 18V to 36V, switching at 250kHz. The Texas Instruments LM5156HEVM-FLY is designed for ease of configuration, enabling the user to evaluate many different applications on the same module. The PCB is two layers with components populated only on one side. Functionality includes programmable slope compensation, adjustable soft-start, programmable cycle-by-cycle current limit, hiccup mode short-circuit protection, and programmable line undervoltage lockout.

Features

  • Tightly regulated output voltage of 5V
  • The high conversion efficiency of > 86% at full load
  • Hiccup mode short-circuit protection
  • User-adjustable secondary side soft-start time
  • 10V auxiliary winding to power the VCC pin
  • 250kHz switching frequency
  • 2-layer PCB with components populated on one side

Required Equipment

  • Power Supply
    • The input voltage source (VIN) should be a variable supply capable of 0V to 36V and source at least 5A
  • Multimeters
    • Voltmeter 1
      • Input voltage, connect from VIN to PGND
    • Voltmeter 2
      • Output voltage, connect from VOUT to ISO_GND
    • Ammeter 1
      • Input current, must be able to handle 5A
      • Shunt resistor can be used as needed
    • Ammeter 2
      • Output current, must be able to handle 5A
      • 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 4A at 5V
  • 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

Mechanical Drawing - Texas Instruments LM5156HEVM-FLY Controller Evaluation Module (EVM)

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Texas Instruments LM5156HEVM-FLY Controller Evaluation Module (EVM)