SLUUCJ2C july   2021  – august 2023 UCC14240-Q1 , UCC14241-Q1 , UCC15240-Q1 , UCC15241-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
    1. 1.1 U1 Component Selection
    2. 1.2 Pin Configuration and Functions
  5. 2Description
    1. 2.1 EVM Electrical Performance Specifications
  6. 3Schematic
  7. 4EVM Setup and Operation
    1. 4.1 Recommended Test Equipment
    2. 4.2 External Connections for Easy Evaluation
    3. 4.3 Powering the EVM
      1. 4.3.1 Power on for Start-up
      2. 4.3.2 Power off for Shutdown
    4. 4.4 EVM Test Points
    5. 4.5 Probing the EVM
  8. 5 Performance Data
    1. 5.1  Efficiency Data
    2. 5.2  Regulation Data
    3. 5.3  Steady State Input Current
    4. 5.4  Start-up Waveforms
    5. 5.5  Inrush Current
    6. 5.6  AC Ripple Voltage
    7. 5.7  EN-to-/PG Timing
    8. 5.8  RLIM
    9. 5.9  Fault Protection
      1. 5.9.1 Output UVLO
      2. 5.9.2 Output OVP
    10. 5.10 Shutdown
    11. 5.11 Thermal Performance
  9. 6Assembly and Printed Circuit Board (PCB) Layers
  10. 7Bill of Materials (BOM)
  11. 8Revision History

4.2 External Connections for Easy Evaluation

The UCC14240EVM-052 EVM uses screw terminals for quickly connecting to the VIN, VDD ,and VEE pins. Connecting the appropriate ammeters and voltmeters, as shown in Figure 4-1, allows accurate EVM efficiency measurements to be made.

Connecting Test Equipment

  1. Move jumper SH-J1 into the J3:1-2, EN OFF position. This makes sure the EVM cannot start while test equipment is being connected.
  2. Connect a +5 V DC bias power supply to J1:1-2 (+3.3 V to +5 V). Set the power supply to 0 V. The +5 V supply at J1 serves as the pullup bias for /PG and ENA. Turn off/disable the +5V DC Bias power supply.
  3. Connect the VIN DC power supply capable of 21 V<VIN<27 V, 200 mA at J4:1-2 (VIN). Adjust the power supply to 24 V, and set the current limit to 300 mA. Set the power supply voltage to 24 V. Turn off/disable the VIN power supply.
  4. Connect a variable load between J2:1 (VDD) and J2:3 (VEE). If using an electronic load, set to constant current (CC), 80 mA. Leave the load disabled until the EVM is powered.
  5. Connect a second load between J2:2 (COM) and J2:3 (VEE). If using an electronic load, set to constant current (CC), 10 mA. Leave the load disabled until the EVM is powered. Since the required load is small, a through-hole, 250-mW, 511-Ω load resistor can be connected between J2:2-3.
  6. Some electronic loads are not be able to regulate/stabilize CC when setting in the low mA range. Monitor the input current and load currents by inserting ammeters, A2 and A3, as shown in Figure 4-1. Use a current probe with the oscilloscope to verify the stability of the DC current being regulated by an electronic load.

GUID-20221122-SS0I-JTWZ-R4PK-GVGD2CHC23F4-low.svg

Figure 4-1 Typical Efficiency Measurement Setup