Datasheet

5.3 Switch Node and Output Ripple Voltage
5.4 Output Ripple Voltage
www.ti.com TPS55386EVM-363 Typical Performance Data and Characteristic Curves
V
IN
= 13.2V, = 5.0V I
OUT1
= 3A, V
OUT2
= 3.3V I
OUT2
= 3A
Ch1: TP3 (VOUT1), Ch2: TP18 (VOUT2) Ch3: TP9 (SW1), Ch4: TP12 (SW2)
Figure 7. TPS55386EVM-363 Output Voltage Ripple
The output ripple voltage measured at the output test points (TP3 and TP4 or TP18 and TP19) will include
some high-frequency switch edge noise and offsets due to the ground loop area in this measurement. See
Figure 8 . A more accurate measurement of the output ripple can be taken by soldering a bare wire directly
to the output capacitor (C5 or C17) and connecting this wire directly to the ground barrel of the
oscilloscope probe. This produces truer oscillograms of the output ripple. See Figure 9 .
CH1: V
OUT1
CH2: V
OUT2
Figure 8. Output Ripple Voltage Measured at Test Points
SLVU273 – September 2008 Using the TPS55386EVM-363 A 12V Input, 5.0V & 3.3V Output, 3A Non-Synchronous Buck Converter 13
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