TIDT256A March   2022  – March 2022

 

  1.   Description
  2.   Features
  3.   Applications
  4. 1Test Prerequisites
    1. 1.1 LM5156-Q1
      1. 1.1.1 Loading LM5156-Q1
      2. 1.1.2 LM5156-Q1 SEPIC Bode Loop Testing
    2. 1.2 Loading UCC14240-Q1
    3. 1.3 UCC5870-Q1 and UCC5870-Q1 EVM GUI
    4. 1.4 Voltage and Current Requirements
    5. 1.5 Required Equipment
    6. 1.6 Considerations
    7. 1.7 Dimensions
  5. 2Testing and Results
    1. 2.1 SEPIC Efficiency Graphs
    2. 2.2 SEPIC Efficiency Data
    3. 2.3 SEPIC Bode Plots
    4. 2.4 Thermal Images
  6. 3Waveforms
    1. 3.1 SEPIC Switching
    2. 3.2 SEPIC Output Voltage Ripple
    3. 3.3 SEPIC Load Transients
    4. 3.4 SEPIC Start-Up Sequence
    5. 3.5 Isolated Bias Supply Start Up and Shutdown
    6. 3.6 Isolated Gate Drive

1.3 UCC5870-Q1 and UCC5870-Q1 EVM GUI

This section shows how to evaluate the UCC5870-Q1 with the UCC5870-Q1 EVM GUI.

Use the UCC5870QEVMGUI-044 MCU daughter board to communicate between PMP22817 port J3 and a Personal Computer (PC) with the UCC5870-Q1 EVM GUI software installed.

Ordering a UCC5870-Q1 EVM includes the UCC5870QEVMGUI-044 and cable to connect from the UCC5870QEVMGUI-044 to a USB port on the PC. The user’s guide for the EVM includes instructions to download the GUI onto a PC, and then instructions to operate the UCC5870-Q1 on the PMP22817 after power up.

Use the PMP22817-adapterA to connect PMP22817 J3 to this UCC5870QEVMGUI-044 J103. Both boards should plug into this adapter such that they do not overlap.

Table 1-3 Connections of This Plug-In Adapter
UCC5870QEVMGUI-044
J103 Pin Number		 PMP22817
J3 Pin Number		 PMP22817
Pin Name
9 12 SDI_ADD
10 13 SDO_ADD
8 9 nCS
14 5 nFLT2
3 3 Vbias
7 10 CLK
12 8 INP
13 6 nFLT1
15 15 GND

Also, use the USB A male-B micro to male 1-M cable from the same MCU daughter board UCC5870QEVMGUI-044 to connect its J100 to any USB port on a PC with the UCC5870-Q1 EVM GUI software loaded.

Make sure the J5 jumper on the PMP22817 is in place to allow the 24 V from the SEPIC to power the UCC14020-Q1. Connect VIN to J1, Vbias to J2, and power up. Once PMP22817 is powered up, follow the steps in the power up section of the UCC5870QDWJEVM-026 Evaluation Module users guide, after the step that creates the PWM waveforms, there is a –5 V to 15 V, 10 kHz, 50% duty cycle square wave present between the gate and GND pads.