Texas Instruments TPS54320, Руководство пользователя

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2.7 Output Voltage Ripple
Figure 2-7 shows the TPS54320 output voltage ripple. The output current is the rated full load of 3 A and
V
IN
= 12 V. The ripple voltage is measured directly across the output capacitors with a low inductance probe.
Measuring at the output test points, TP8 and TP9, can pick up some radiated noise and give an erroneous
measurement.
V = 10 mV/div (AC coupled)
OUT
t - Time - 1 s/div
m
Inductor current = 1 A/div
PH = 10 V/div
Figure 2-7. TPS54320 Output Ripple
2.8 Input Voltage Ripple
Figure 2-8 shows the TPS54320 input voltage. The output current is the rated full load of 3 A and V
IN
= 12 V.
The ripple voltage is measured directly across the input capacitors.
V = 200 mV/div (AC coupled)
IN
Inductor current = 1 A/div
PH = 10 V/div
t - Time - 1 s/div
m
Figure 2-8. TPS54320 Input Ripple
Test Setup and Results www.ti.com
8 TPS54320 Step-Down Converter Evaluation Module User's Guide SLVU380A – SEPTEMBER 2010 – REVISED OCTOBER 2021
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