Texas Instruments SWIFT TPS548A20, Руководство пользователя

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5 Test Setup
5.1 Test Equipment
Oscilloscope A digital or analog oscilloscope measures the output ripple. The oscilloscope must be set for
the following: 1-MΩ impedance, 20-MHz bandwidth, AC coupling, 1-µs per division horizontal
resolution, 20-mV per division vertical resolution. Test points TP7 and TP9 measure the output
ripple voltage by placing the oscilloscope probe tip through TP7 and holding the ground barrel
on TP9 as shown in
Figure 5-1 . Using a leaded ground connection can induce additional noise
due to the large ground loop.
Voltage Source The input voltage source VIN must be a 0 to 14-V variable-DC source capable of supplying 10
ADC. Connect VIN to J1 as shown in
Figure 5-2 .
Multimeters V1: VIN at TP1 (VIN) and TP4 (GND).
V2: VOUT at TP7 (VOUT) and TP9 (GND).
Output Load The output load must an electronic constant-resistance-mode load capable of 0 to 15 ADC at
1.2 V.
T 9 P
T 7 P
Metal Ground Barrel
Probe Tip
Figure 5-1. Tip and Barrel Measurement for Output Voltage Ripple
Recommended Wire Gauge:
1. V
IN
to J1 (12-V input)
• The recommended wire size is 1× AWG number 14 per input connection, with the total length of wire less
than 4 feet (2 feet input, 2 feet return).
2. J3 to LOAD
• The minimum recommended wire size is 2× AWG number 14, with the total length of wire less than 4 feet
(2 feet output, 2 feet return).
www.ti.com Test Setup
SLUUBC0A – DECEMBER 2015 – REVISED AUGUST 2021
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TPS548A20 SWIFT™ Step-Down Converter Evaluation Module User's Guide 7
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