Texas Instruments TPS40345EVM-353, Руководство пользователя, Страница: 10 / 23

0 5 10 15 20
I - Load Current - A
L
8 V
12 V
14 V
60
65
70
75
80
85
90
95
h
-Efficiency-%
Channel B
20 LOG
Channel A
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Test Setup
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10 SNVU588 – November 2017
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TPS40345EVM-353 Evaluation Module
3. Connect input signal amplitude measurement probe (channel A) to TP7 as shown in Figure 4 .
4. Connect output signal amplitude measurement probe (channel B) to TP5 as shown in Figure 4 .
5. Connect ground lead of channel A and channel B to TP6 and TP8 as shown in Figure 4 .
6. Inject 30 mV or less signal across R3 through isolation transformer.
7. Sweep frequency from 1 kHz to 1 MHz with 10-Hz or lower post filter.
8. Control loop gain can be measured by
9. Control loop phase can be measured by the phase difference between channel A and channel B.
10. Control to output response (power stage transfer function) can be measured by connecting channel A
probe to TP10 (COMP) and channel B probe to TP5 (CHB).
11. Output to control response (compensated error amplifier transfer function) can be measured by
connecting channel A probe to TP7 (CHA) and channel B probe to TP10 (COMP).
12. Follow Section 5.3 steps 6 and 7 to power down.
5.6 Equipment Shutdown
1. Shut down oscilloscope
2. Shut down LOAD1
3. Shut down V
IN
4. Shut down fan
6 TPS40345EVM-353 Test Data
Figure 5 through Figure 10 present typical performance curves for the TPS40345EVM-353. Since actual
performance data can be affected by measurement techniques and environmental variables, these curves
are presented for reference and may differ from actual field measurements.
6.1 Efficiency
V
IN
= 8.0V – 14V, V
OUT
= 1.2V, I
OUT
= 0A – 20A
Figure 5. TPS40345EVM-353 Efficiency vs Load Current