SNVU589A December   2017  – January 2022 TPS53119

 

  1.   Trademarks
  2. 1 Introduction
  3. 2 Description
    1. 2.1 Typical Applications
    2. 2.2 Features
  4. 3 Electrical Performance Specifications
  5. 4 Schematic
  6. 5 Test Setup
    1. 5.1 Test Equipment
    2. 5.2 Recommended Test Setup
  7. 6 Configurations
    1. 6.1 Switching Frequency Selection
    2. 6.2 Soft-Start Selection
    3. 6.3 Mode Selection
    4. 6.4 Enable Selection
  8. 7 Test Procedure
    1. 7.1 Line/Load Regulation and Efficiency Measurement Procedure
    2. 7.2 Control Loop Gain and Phase Measurement Procedure
    3. 7.3 List of Test Points
    4. 7.4 Equipment Shutdown
  9. 8 Performance Data and Typical Characteristic Curves
    1. 8.1 Efficiency
    2. 8.2 Load Regulation
    3. 8.3 Output Transient
    4. 8.4 Output Ripple
    5. 8.5 Switching Node
    6. 8.6 Enable Turn-On/Turn-Off
    7. 8.7 Output 1.1-V Prebias Turn-On
    8. 8.8 Bode Plot
    9. 8.9 Thermal Image
  10. 9 EVM Assembly Drawing and PCB Layout
  11. 10Bill of Materials
  12. 11Revision History

5.1 Test Equipment

Voltage Source: The input voltage source VIN must be a 0-V to 14-V variable DC source capable of supplying 10 ADC. Connect VIN to J4 as shown in Figure 5-2.

Multimeters:
V1: VIN at TP7 (VIN) and TP8 (GND)
V2: VOUT at TP14 (Vout) and TP15 (GND)
A1: VIN input current

Output Load: The output load must be an electronic constant resistance mode load capable of 0 ADC to 30 ADC at 1.1 V.

Oscilloscope: A digital or analog oscilloscope can be used to measure the output ripple. The oscilloscope must be set for the following:

  • 1-MΩ impedance
  • 20-MHz bandwidth
  • AC coupling
  • 2-µs/division horizontal resolution
  • 50-mV/division vertical resolution

Test points TP14 and TP15 can be used to measure the output ripple voltage by placing the oscilloscope probe tip through TP14 and holding the ground barrel on TP15 as shown in Figure 5-1. Using a leaded ground connection may induce additional noise due to the large ground loop.

GUID-06A22868-3247-4875-993A-769FEA2C2D4B-low.gifFigure 5-1 Tip and Barrel Measurement for VOUT Ripple

Fan: Some of the components of this EVM can approach temperatures of 60°C during operation. A small fan capable of 200–400 LFM is recommended to reduce component temperatures while the EVM is operating. The EVM must not be probed if the fan is not running.

Recommended Wire Gauge:

  1. VIN to J4 (12-V input):
    The recommended wire size is 1 × AWG 14 per input connection, with the total length of wire less than four feet (2-foot input, 2-foot return).
  2. J5 to LOAD:
    The minimum recommended wire size is 2 × AWG 14, with the total length of wire less than four feet (2-foot output, 2-foot return)