Datasheet

5.5 CONTROL LOOP BODE PLOT
5V
-60
-40
-20
0
20
40
60
80
100
0 1 10 100 1000
f-Frequency-kHz
-135
-90
-45
0
45
90
135
180
225
Gain
Phase
Gain-dB
3.3V
-60
-40
-20
0
20
40
60
80
100
0 1 10 100 1000
F-Frequency-kHz
-135
-90
-45
0
45
90
135
180
225
Gain
Phase
Gain-dB
TPS55386EVM-363 Typical Performance Data and Characteristic Curves www.ti.com
CH1: V
OUT1
CH2: V
OUT2
Figure 9. Output Ripple Voltage Measured at Test Points
V
IN
= 12V, V
OUT1
= 5.0V, V
OUT2
= 3.3V, I
OUT1
= I
OUT2
= 3A
V
OUT1
: Bandwidth: 40 kHz Phase Margin: 69 °
V
OUT2
: Bandwidth: 33 kHz Phase Margin: 71 °
Figure 10. TPS55386EVM-363 Gain and Phase vs Frequency
Using the TPS55386EVM-363 A 12V Input, 5.0V & 3.3V Output, 3A Non-Synchronous Buck Converter14 SLVU273 – September 2008
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