Texas Instruments TPS53915, 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 / division horizontal resolution
• 20-mV / 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 V
OUT
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 four 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 four
feet (two feet output, two feet return).
Test Setup www.ti.com
4 TPS53915 Step-Down Converter Evaluation Module User's Guide SLUUAS2C – OCTOBER 2013 – REVISED NOVEMBER 2021
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