SNVU736 September   2020 LM51561H , LM51561H-Q1 , LM5156H , LM5156H-Q1

 

  1.   Trademarks
  2. 1Introduction
    1. 1.1 Features
    2. 1.2 Applications Schematic
    3. 1.3 Electrical Parameters
  3. 2EVM Setup
    1. 2.1 EVM Connectors and Test Points
  4. 3Testing Procedures
    1. 3.1 Testing Equipment
    2. 3.2 Precautions
  5. 4Test Results
    1. 4.1 Efficiency Curve
    2. 4.2 Load Regulation
    3. 4.3 Thermal Performance
    4. 4.4 Steady State Waveforms
    5. 4.5 Start-up Waveforms
    6. 4.6 Load Transient Waveforms
    7. 4.7 Load Short-Circuit
    8. 4.8 AC Loop Response
  6. 5PCB Layout
  7. 6Schematics
  8. 7Bill of Materials

3.1 Testing Equipment

Power Supply: The input voltage source (VIN) should be a variable supply capable of 0 V to 36 V and source at least 5 A.

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 5 A. Shunt resistor can be used as needed.
  • Ammeter 2: Output current, must be able to handle 5 A. 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 4 A at 5 V.

Oscilloscope: 20-MHz 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.