SLUUCU2A March   2023  – September 2023 UCC14130-Q1 , UCC14131-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. 5Performance 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 and Timing
    8. 5.8  RLIM
    9. 5.9  Shutdown
    10. 5.10 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 measure 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-A89C3D9F-E165-41F6-8027-AC8BE41E47AA-low.png
top: VDD-VEE, 5 V/div,bot: IIN, 1 A/div,
mid-1: [+5 V]-VEE, 2 V/div,time = 1 ms/div,
mid-2: EN, 5 V/div,
Figure 5-9 Inrush Current: VIN = 12 V, IVDD = 130 mA, I[+5V] = 10 mA
Note: VDD, VEE, and [+5V], etc., refer to Table 4-1 and Figure 4-1.
GUID-099C49C9-81CA-4748-9DE8-4AC55C9CDE79-low.png
top: VDD-VEE, 5 V/div,bot: IIN, 1 A/div,
mid-1: [+5 V]-VEE, 2 V/div,time = 1 ms/div,
mid-2: EN, 5 V/div,time_zoom = 100 µs/div
Figure 5-10 Inrush Current: VIN = 12 V, IVDD = 130 mA, I[+5V] = 10 mA
GUID-B74DA1D3-DB5E-466A-B1F5-0C580A15A8E4-low.png
top: VDD-VEE, 5 V/divbot: IIN, 1 A/div
mid-1: [+5V]-VEE, 2 V/divtime = 1 ms/div
mid-2: EN, 5 V/div,
Figure 5-11 Inrush Current: VIN = 12 V, IVDD = 0 mA, I[+5V] = 0 mA
Note: VDD, VEE, and [+5V], etc., refer to Table 4-1 and Figure 4-1.
GUID-CD778E1F-DC69-4177-830F-0D5C34EA63E2-low.png
top: VDD-VEE, 5 V/div,bot: IIN, 1 A/div,
mid-1: [+5 V]-VEE, 2 V/div,time = 1 ms/div,
mid-2: EN, 5 V/div,time_zoom = 100 µs/div
Figure 5-12 Inrush Current: VIN = 12 V, IVDD = 0 mA, I[+5V] = 0 mA