SLVU735A June   2012  – February 2022 TPS51225

 

  1.   Trademarks
  2. 1 Description
    1. 1.1 Typical Applications
    2. 1.2 Features
  3. 2 Electrical Performance Specifications
  4. 3 Schematic
  5. 4 Test Setup
    1. 4.1 Test Equipment
    2. 4.2 Recommended Test Setup
  6. 5 Configurations
  7. 6 Test Procedure
    1. 6.1 Line/Load Regulation and Efficiency Measurement Procedure
    2. 6.2 List of Test Points
    3. 6.3 Equipment Shutdown
  8. 7 Performance Data and Typical Characteristic Curves
    1. 7.1  5-V Efficiency
    2. 7.2  5-V Load Regulation
    3. 7.3  3.3-V Efficiency
    4. 7.4  3.3-V Load Regulation
    5. 7.5  Enable Turn-On/Turn-Off
    6. 7.6  Output Ripple
    7. 7.7  Switching Node
    8. 7.8  5-V Output Transient with Auto-skip Mode
    9. 7.9  3.3-V Output Transient with Auto-skip Mode
    10. 7.10 Output Prebias Turn-On
    11. 7.11 Thermal Image
  9. 8 EVM Assembly Drawing and PCB Layout
  10. 9 Bill of Materials
  11. 10Revision History

4.2 Recommended Test Setup

GUID-EE18D8FD-347D-4B69-8A01-86375DF468CF-low.gifFigure 4-2 TPS51225EVM-133 Recommended Test Setup

Figure 4-2 is the recommended test setup for evaluating the EVM. Working at an ESD workstation, make sure that any wrist straps, bootstraps, or mats are connected referencing the user to earth ground before power is applied to the EVM.

Input Connections:

  1. Prior to connecting the DC input source, VIN, it is advisable to limit the source current from VIN to 10-A maximum. Make sure VIN is initially set to 0 V and connected as shown in Figure 4-2.
  2. Connect a voltmeter, V1, at TP1 (VIN) and TP6 (GND) to measure the input voltage.
  3. Connect a current meter, A1, to measure the input current.

Output Connections:

  1. Connect Load1 to J2 and set Load to constant resistance mode to sink 0 ADC before VIN is applied
  2. Connect a voltmeter, V2, at TP2 (Vout1) and TP7 (GND) to measure the output1 voltage.
  3. Connect Load2 to J3 and set Load to constant resistance mode to sink 0 ADC before VIN is applied.
  4. Connect a voltmeter, V3, at TP3 (Vout2) and TP8 (GND) to measure the output2 voltage.

Other Connections:
Place a fan as shown in Figure 4-2 and turn it on, making sure air is flowing across the EVM.