SLVUCT0 November   2023

 

  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5.   5
  6. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  7. 2Hardware
    1. 2.1 Additional Images
    2. 2.2 EVM Connections
  8. 3Implementation Results
    1. 3.1 Test Data and Performance Curves
      1. 3.1.1 Efficiency and Load Regulation Performance
      2. 3.1.2 Waveforms and Plots
      3. 3.1.3 Thermal Performance
      4. 3.1.4 EMI Performance
  9. 4Hardware Design Files
    1. 4.1 Schematic
    2. 4.2 PCB Layout
    3. 4.3 Bill of Materials
  10. 5Additional Information
    1.     Trademarks
  11. 6Related Documentation
    1. 6.1 Supplemental Content
    2. 6.2 Custom Design With WEBENCH® Tools

2.2 EVM Connections

Working at an ESD-protected workstation, make sure that any wrist straps, bootstraps, or mats are connected and referencing the user to earth ground before power is applied to the EVM.

Refer to the connections depicted in Figure 3-2 for a visual guide on powering up the EVM.

  1. Connect the input voltage supply between VIN_EMI and GND (J1) terminals using short thick wires.
  2. Connect the load for the 5-V output between VOUT1 and GND (J6) terminals using short thick wires.
  3. Connect the load for the 3.3-V output between VOUT2 and GND (J7) terminals using short thick wires.
  4. Connect the input voltage sense lines to TP1 (VIN_EMI) and TP2 (GND).
  5. Connect 5-V output voltage sense lines to TP15 (VOUT1_S+) and TP13 (VOUT1_S-).
  6. Connect 3.3-V output voltage sense lines to TP16 (VOUT2_S+) and TP14 (VOUT2_S-).
  7. Set the input voltage (VIN) at the appropriate level between 6.3-V to 36-V.
  8. Set the current limit of the input supply to an appropriate level depending on the connected output load.
  9. Make sure VOUT1 ENABLE is set to ON by having the jumper in appropriate position on J2.
  10. Make sure VOUT2 ENABLE is set to ON by having the jumper in appropriate position on J3.
  11. Make sure Frequency Select is set to desired operating frequency by having the jumper in appropriate position on J4.
  12. Make sure SYNC is set to desired mode by having the jumper in appropriate position on J5.
    1. Short SYNC to GND for PFM Mode operation.
    2. Short SYNC to VCC for FPWM Mode operation.
  13. Turn on the power supply. The default configuration of the EVM must power up to VOUT1 = 5-V, VOUT2 = 3.3-V
  14. Monitor the output voltage and current. The maximum rated load current for each output is 3-A.
GUID-20231017-SS0I-LZ62-H7MB-T0BVXNCVGHBK-low.svg Figure 2-2 EVM Test Setup
Table 2-1 EVM Power Connections
LABELDESCRIPTION
VIN+Positive input power connection.
VIN–Negative input power connection.
VIN EMI+Positive input power connection for EMI test.
VIN EMI-Negative input power connection for EMI test.
VOUT1+CH1 Positive output power connection.
VOUT1–CH1 Negative output power connection.
VOUT2+CH2 Positive output power connection.
VOUT2–CH2 Negative output power connection.
Table 2-2 EVM Signal Connections
LABELDESCRIPTION
VINTP4: Positive input sense pin for measuring efficiency.
GNDTP3: Negative input sense pin for measuring efficiency.
VOUT1S+TP15: CH1 positive output sense pin for measuring efficiency, and line and load regulation.
VOUT1S–TP13: CH1 negative output sense pin for measuring efficiency, and line and load regulation.
VOUT2S+TP16: CH2 positive output sense pin for measuring efficiency, and line and load regulation.
VOUT2S–TP14: CH2 negative output sense pin for measuring efficiency, and line and load regulation.
GNDGround reference point.
SYNCLight load switching mode selection. Connect SYNC and VCC for a FPWM mode . Connect SYNC and GND for an AUTO mode.
CONFIGSpread spectrum enable, disable. Connect CONFIG to GND to disable the spread spectrum. Modify R14 for proper configuration according to TODO The EVM needs to restart after changing the jumper setting.
EN1CH1 enable, disable. Connect pin 1 and pin 2 to enable CH1. Connect pin 2 and pin 3 to disable CH1. Remove any jumper when programing the line UVLO using a resistor divider. Populate the external UVLO resistor divider.
EN2CH2 enable, disable. Connect pin 1 and pin 2 to enable CH2. Connect pin 2 and pin 3 to disable CH2. Remove any jumper when programing the line UVLO using a resistor divider. Populate the external UVLO resistor divider.
PG1Probe point for CH1 power-good indicator. A pullup resistor is connected to VCC.
PG2Probe point for CH2 power-good indicator. A pullup resistor is connected to VCC.
Table 2-3 EVM Configurations
RConfig(kΩ) Mode
0 Dual output spread spectrum disabled
121 Dual output spread spectrum enabled