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6 Test Procedure
6.1 Line and Load Regulation
1. Increase V
IN
from 0 V to 8 V.
2. Step LOAD1 from 0 A to 20 A.
3. Record, V
IN
, I
IN
, V
OUT
and I
OUT
for each LOAD1 step.
4. Step V
IN
from 8 V to 20 V.
5. Repeat 2 to 4 above for each V
IN
step.
6. See Section 6.6 for equipment shut down.
See Section 7.1 and Section 7.2 for typical line and load regulation curves and efficiency results.
6.2 Output Ripple Measurement (TP5, TP13)
1. Set up the EVM as described in Section 5.2 and Figure 5-1 .
2. Set the oscilloscope to the following:
• 1-MΩ input impedance
• 20-MHz Bandwidth
• AC coupling
• 1-μs/div horizontal resolution
• 10-mV/div vertical resolution
3. Place the oscilloscope probe tip through TP5 and hold the ground barrel to TP13 as shown in Figure 6-1 . For
a hands free approach, the loop in TP13 can be cut and opened to cradle the probe barrel. V2 can have to
be removed from these test points to allow the oscilloscope to be connected.
4. Increase V
IN
to 8 V.
5. Vary LOAD1 from 0 A to 20 A and observe the oscilloscope waveform.
6. Repeat step 5 for various V
IN
values up to 20 V.
7. See Section 6.6 for equipment shutdown.
See Section 7.3 for typical ripple voltage results
TP13 TP5
Metal Ground Barrel
Probe Tip
Figure 6-1. Output Ripple Measurement - Tip and Barrel Using TP5 and TP13
Test Procedure www.ti.com
8 TPS40195 Buck Controller Evaluation Module User's Guide SLUU297B – DECEMBER 2007 – REVISED JANUARY 2022
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