TIDT343 October   2023

 

  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5. 1Test Prerequisites
    1. 1.1 Voltage and Current Requirements
    2. 1.2 Dimensions
  6. 2Testing and Results
    1. 2.1 Efficiency Graphs
    2. 2.2 Efficiency Data
    3. 2.3 Thermal Images
    4. 2.4 Bode Plots
    5. 2.5 EMI
  7. 3Waveforms
    1. 3.1 Switching
    2. 3.2 Output Voltage Ripple
    3. 3.3 Input Voltage Ripple
    4. 3.4 Load Transients
    5. 3.5 Start-Up Sequence

2.5 EMI

Conductive EMI measurements are shown in the following figures. The test conditions are VIN = 12 V, IOUT1 = 2.5 A (e-load), IOUT2 = 1.2 A (1-Ω resistor).

The measurement itself is split into two frequency ranges:

  • “HF”, 150 kHz to 30 MHz (LW, MW, SW)
  • “FM”, 30 MHz to 108 MHz (VHF)

The limit lines are set as per CISPR25 Class 5 (Peak and Average).


GUID-20230919-SS0I-JS2H-5C8R-C10CF10CHD5M-low.jpg
Figure 2-6 EMI Test Setup

GUID-20230918-SS0I-XGWW-4KZL-NM3T9QK7CST6-low.jpg
Figure 2-7 Negative Terminal, 150 kHz to 30 MHz, Noise Floor

GUID-20230918-SS0I-Q3ZB-PNJP-P4VHS8XLJZKG-low.jpg
Figure 2-8 Negative Terminal, 150 kHz to 30 MHz, Board ON

GUID-20230918-SS0I-MFXR-L9LN-0CWFD7BWTLMF-low.jpg
Figure 2-9 Negative Terminal, 30 MHz to 108 MHz, Noise Floor

GUID-20230918-SS0I-MPWM-MBLB-PCL39Z0NBXCS-low.jpg
Figure 2-10 Negative Terminal, 30 MHz to 108 MHz, Board ON

GUID-20230918-SS0I-NXQK-VD67-SKRWLLW9DRWL-low.jpg
Figure 2-11 Positive Terminal, 150 kHz to 30 MHz, Noise Floor

GUID-20230918-SS0I-GXXG-4F8V-321P0SH7ZHH8-low.jpg
Figure 2-12 Positive Terminal, 150 kHz to 30 MHz, Board ON

GUID-20230918-SS0I-CTHQ-TF63-WNKJMG3FPSLN-low.jpg
Figure 2-13 Positive Terminal, 30 MHz to 108 MHz, Noise Floor

GUID-20230918-SS0I-ZVQT-JLDS-DHPRBRQCW3CC-low.jpg
Figure 2-14 Positive Terminal, 30 MHz to 108 MHz, Board ON