Texas Instruments TPS53819A, User Manual

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4 Test Setup
4.1 Test and Configuration Software
In order to change any of the default configuration parameters on the EVM, it is necessary to obtain the TI
Fusion Digital Power Designer software.
4.1.1 Description
Fusion Digital Power Designer is the Graphical User Interface (GUI) used to configure and monitor Texas
Instrument’s (TI) TPS53819A power controller on this evaluation module (EVM). The application uses the
PMBus protocol to communicate with the controller over serial bus by way of a TI USB Interface Adapter EVM
included.
4.1.2 Features
Some of the tasks performed with the GUI include:
• Turn on or off the power supply output, either through the hardware control line or the PMBus operation
command.
• Configure common operating characteristics such as V
OUT
, switching frequency, soft-start time, and more.
• Monitor status and warnings or fault conditions real-time.
The software is available for download at this location:
http://focus.ti.com/docs/toolsw/folders/print/fusion_digital_power_designer.html .
4.2 Test Equipment
Voltage Source: The input voltage source V
IN
should be a 0-V to 14-V variable DC source capable of supplying
30 ADC. Connect VIN to J4 as shown in Figure 4-2 .
Multimeters:
• V1: VIN at TP1 (VIN) to TP4 (PGND)
• V2: VOUT at TP7 (VOUT) to TP9 (PGND)
• A1: VIN input current
Output Load: The output load should be an electronic constant-resistance mode load capable of 0 ADC to 25
ADC at 1.2 V. An electronic constant-current load is also acceptable.
Oscilloscope: A digital or analog oscilloscope can be used to measure the output ripple. The oscilloscope must
be set for 1-MΩ impedance, 20-MHz bandwidth, AC coupling, 2-μs per division horizontal resolution, 20-mV per
division vertical resolution. As shown in
Figure 4-1 , test points TP7 and TP9 can be used to measure the output
ripple voltage by placing the oscilloscope probe tip through TP7 and holding the ground barrel to TP9. It is not
recommended to use a long leaded ground connection because this may induce additional noise due to a large
ground loop. Alternatively, the output ripple can be measured directly across C14 with a short ground lead as
shown in
Figure 4-2 . To measure other waveforms, adjust the oscilloscope as needed.
Figure 4-1. Tip and Barrel Measurement for V
OUT
Ripple
www.ti.com Test Setup
SLVU719B – MAY 2012 – REVISED NOVEMBER 2021
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