TIDT279 October   2022

 

  1.   Description
  2.   Features
  3.   Applications
  4. 1Test Prerequisites
    1. 1.1 Power and Load Connections and Test Points
    2. 1.2 Voltage and Current Requirements
    3. 1.3 Required Equipment
    4. 1.4 Considerations
    5. 1.5 Board Dimensions
  5. 2Testing and Results
    1. 2.1 Efficiency and Loss Graphs
    2. 2.2 Thermal Images
    3. 2.3 Bode Plots
    4. 2.4 Conducted Emissions vs CISPR Class 5
  6. 3Waveforms
    1. 3.1 Output Voltage Ripple
    2. 3.2 Load Transients
    3. 3.3 Start-Up of Each Independently-Controlled Output

1.3 Required Equipment

  • VIN power supply 6 V to 18 V, at least 5 A
  • Resistive loads: Use actual resistors for conducted emissions testing
  • Electronic load to step for efficiency graphs, and for dynamic load testing such as Kikusui PLZ334WL
  • To connect onboard dynamic load for the 3.3-V output current sense, J300 to a BNC scope input: Taoglas CAB.011 (cable SMA jack) and Amphenol RF 095-850-250-024 [cable assembly coaxial BNC to SMA RG-316 DS 24.00 in (609.60 mm)]
  • Signal generator with pulse mode such as Tektronix AFG3102
  • Oscilloscope such as Tektronix MDO34 with TPP0500B 10 × voltage probes and 30-A TCP0030A current probe
  • Digital multimeters such as Fluke 87iii or 87V
  • For Bode plots: Vector Network Analyzer such as Bode 100 from OMICRON Lab
  • Thermal camera such as FLIR E75
  • Keysight 34970 data acquisition, switch unit along with calibrated 10-A and 1-A current shunts for efficiency measurements
  • Automotive CISPR 25 conducted emissions setup with EMI receiver such as Rohde & Schwarz ESRP EMI test receiver