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

5.5 Inrush Current

Inrush current measurement made with VIN applied and toggle EN pin. This makes sure the input capacitors are pre-biased to VIN and make negligible contribution to the measured inrush current. Inrush current is measured by connecting a current probe to the positive connecting cable between the input supply voltage and the EVM, J4 terminal block.


GUID-20230214-SS0I-XTDP-FN2T-PNLT2FGD7ZP7-low.png

Figure 5-9 Inrush Current 1: VIN=15 V, IVDD-VEE=68 mA, (top: VDD-VEE, 10 V/div, mid-1: COM-VEE, 2 V/div, mid-2: VDD-COM, 20 V/div, mid-3: VEE-COM, 5 V/div, mid-4: IIN, 1 A/div, bot: /PG, 5 V/div), time = 1 ms/div

GUID-20230214-SS0I-MSZP-SNPT-N0DWTZWQDFVZ-low.png

Figure 5-10 Inrush Current 2: VIN=15 V, IVDD-VEE=0 mA, (top: VDD-VEE, 10 V/div, mid-1: COM-VEE, 2 V/div, mid-2: VDD-COM, 20 V/div, mid-3: VEE-COM, 5 V/div, mid-4: IIN, 1 A/div, bot: /PG, 5 V/div), time =1 ms/div

GUID-20230214-SS0I-DX1K-SNJP-5HQTX4TKCTBZ-low.png

Figure 5-11 Inrush Current 3: VIN=15 V, IVDD-VEE=0 mA, (top: VDD-VEE, 10 V/div, mid-1: COM-VEE, 2 V/div, mid-2: VDD-COM, 20 V/div, mid-3: VEE-COM, 5 V/div, mid-4: IIN, 1 A/div, bot: /PG, 5 V/div, zoom: 250 mA/div), time =1 ms/div, time_zoom=200 µs/div