TIDT349 January   2024

 

  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5. 1Test Prerequisites
    1. 1.1 Voltage and Current Requirements
    2. 1.2 Required Equipment
    3. 1.3 Considerations
    4. 1.4 Dimensions
    5. 1.5 Test Setup
  6. 2Testing and Results
    1. 2.1 Efficiency Graphs
    2. 2.2 Efficiency Data
    3. 2.3 Thermal Images
  7. 3Waveforms
    1. 3.1 Charge Mode Start-Up Waveform
    2. 3.2 OTG Mode Start-Up Waveform
    3. 3.3 Voltage Transition at OTG Mode
    4. 3.4 Ripple and Noise at OTG Mode
    5. 3.5 Load Transients at OTG Mode
    6. 3.6 Switching Waveform
    7. 3.7 Overcurrent Protection at OTG Mode
    8. 3.8 Short-Circuit Protection at OTG Mode
    9. 3.9 Short-Circuit Protection at Charge Mode

2.3 Thermal Images

Table 2-4 shows the thermal images at full power charge mode and OTG mode. All images were captured at 25ºC ambient temperature, after a 30-minute warm up.

Table 2-4 Thermal Results: Full Power Charge Mode and OTG Mode
Temperature(°C) Test Condition
Component Charge Mode (20Vsys to 10S BAT Full Load) OTG Mode (42V BAT to 20V at 5A, 100W)
Q2 (Vsys high side) 59.4 63.1
Q4 (Vsys low side) 58.6 60.2
Q1(Vbat high side) 64 76.8
Q3 (Vbat low side) 73.6 66.8
Buck-Boost inductor 64.2 66.3
TPS25751 68.6 72.2
BQ25756 53.2 57.3
Rsense (Input) 61.5 62.1
Rsense (CHG) 52.6 53.2
GUID-20230812-SS0I-MD8J-MZ2H-LFZGRWX9KLGH-low.pngFigure 2-5 Charge Mode From 20Vsys to 42V Vbat Full Load
GUID-20230812-SS0I-04JT-SB6W-CQG6GQTZ4XWC-low.pngFigure 2-6 OTG Mode From Vbat = 42V to 20V at 5A