SNVU738 March   2022 LM5157 , LM5157-Q1 , LM51571-Q1

 

  1.   Trademarks
  2. 1Features and Electrical Performance
    1. 1.1 Electrical Parameters
    2. 1.2 EVM Power Derating Curve
    3. 1.3 Terminals and Signal Test Points
  3. 2Application Schematic
  4. 3EVM Picture
  5. 4Test Setup and Procedure
    1. 4.1 Bench Setup
    2. 4.2 Test Equipment
    3. 4.3 Precautions
  6. 5Test Data
    1. 5.1 Efficiency
    2. 5.2 Output Regulation
    3. 5.3 Thermal Performance
    4. 5.4 Typical Power Up
    5. 5.5 Output Ripple Voltage
    6. 5.6 Step Load Response
    7. 5.7 Bode Plots
  7. 6Schematics
  8. 7Bill of Materials
  9. 8Board Layout

4.2 Test Equipment

Power Supply: The input voltage source (VIN) should be an adjustable power supply capable of 0 V to 32 V and source at least 10 A.

Electronic Loads: The E-Load should be capable of at least 20 V and 5 A.

Multimeters:

  • Voltmeter 1: Input voltage, connect from VIN to GND
  • Voltmeter 2: Output voltage, connect from VOUT to GND
  • Ammeter 1: Input current, must be able to handle 10 A. A shunt resistor can be used as needed.
  • Ammeter 2: Output current, must be able to handle 5 A. A shunt resistor can be used as needed.

Oscilloscope: An oscilloscope and 10× probes with at least 20-MHz bandwidth is required. Measure the output voltage ripple directly across an output capacitor with a short ground lead. Do not use a long-lead ground connection due to the possibility of noise being coupled into the signal. To measure other waveforms, adjust the oscilloscope as needed.

Input and Output Cables: Cables capable of conducting 10 A current are recommended. Avoid the use of overly-long cables. Cable impedance, especially the inductances, may affect the circuit operation. To minimize the cable impedance effects, twist the pair of cables at both input and output ports.