SLUUCS6A february   2023  – august 2023 UCC14340-Q1 , UCC14341-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 of COM-VEE
    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

Probing the EVM

Using TP3, TP6 and TP9 oscilloscope probe PCB test points: The UCC14341-Q1 is a high frequency DC-DC module that requires careful measurement for accurately capturing transient events and measuring high frequency, AC ripple voltage. Remove the “witch hat” probe tip cover and ground lead from the scope probe. If scope probe ground springs are not available, wrap a piece of 22 AWG bare wire around the scope probe ground ring or use a fitted ground spring and insert the probe tip and ground into the EVM as shown in Figure 4-2.


GUID-20230207-SS0I-2NNV-DX7R-QL8J2SVWDVZQ-low.png

Figure 4-2 UCC14341EVM-069, PCB Scope Probe Test Points

The EVM output nomenclature (VDD, VEE, COM) corresponds to what is commonly used when referring to isolated gate driver ICs. As shown in Figure 3-1, TP4 (COM) is the midpoint of a capacitive divider and is intended to connect to the COM pin of the isolated gate driver IC. When the UCC14341-Q1 is used to bias a gate driver IC, VDD (VDD-COM) and VEE (VEE-COM) are referred to with respect to COM. Therefore, COM cannot be considered as a virtual GND to the gate driver IC. Since the midpoint of the capacitive divider is sensitive to charge imbalance, for the purpose of probing the EVM, do not connect any ground-referenced, test equipment to TP4 (COM). A battery powered DVM can be used to measure VEE with respect to COM. When testing the EVM as a stand-alone bias power supply, oscilloscope probing of the secondary-side outputs must be limited to TP3 and TP6, which are referenced to VEE. This means VDD shows an oscilloscope measurement of VDD+|VEE| and VEE shows |VEE|. Connecting any ground-referenced test equipment to COM can result in a “false”, but safe overcurrent condition causing VDD and VEE to inadvertently drop out of regulation during light load operation.