TIDT235 April   2021

 

  1. 1Description
  2. 2Test Prerequisites
    1. 2.1 Voltage and Current Requirements
    2. 2.2 Required Equipment
    3. 2.3 Dimensions
  3. 3Testing and Results
    1. 3.1 Efficiency Graphs
    2. 3.2 Efficiency Data
    3. 3.3 Thermal Images
    4. 3.4 Load Regulation
  4. 4Waveforms
    1. 4.1 Switching
    2. 4.2 Output Voltage Ripple
    3. 4.3 Load Transients
    4. 4.4 Start-up Sequence

1 Description

This reference design delivers a 48-V output, low-noise power supply for the phantom power application using the TPS61391 and TPS7A4101 devices. The TPS61391 is a 700-kHz PWM step-up converter that converts
3.3 V or 5 V to 48.5 V. The TPS7A4101 is a 50-V tolerant input and 0.29-V drop LDO that steps 48.5 V down to 48 V and minimizes the output ripple. The design supports 48-V, 20-mA output power at 5-V input. The output ripple is only around 8.4 mV, which is pretty low for phantom power applications.

GUID-20210222-CA0I-QK5J-H2LD-X1TSWXLBNHHS-low.pngFigure 1-1 Top Photo
GUID-20210222-CA0I-45C0-7BND-GMF8ZRRVSVWR-low.pngFigure 1-2 Block Diagram