Datasheet

www.ti.com
2.5 Loop Characteristics
-30
-20
-10
0
10
20
30
40
50
60
70
-90
-60
-30
0
30
60
90
120
150
180
210
G - Gain - dB
Phase - Degrees
f - Frequency - Hz
10 100 1 k 100 k10 k 1 M
Gain
Phase
V = 12 V,
V = 3.3 V,
I = 2.5 A,
f = 700 kHz
I
O
O
S
2.6 Output Voltage Ripple
V = 2 V/div
(PH)
V = 7 V, V = 3.3 V, I = 5 A, f = 700 kHz
I O O S
Time - 500 ns/div
V = 10 mV/div (ac) coupled
O
Test Setup and Results
The TPS54550EVM-158 loop-response characteristics are shown in Figure 5 . Gain and phase plots are
shown for VIN voltage of 12 V and load current of 2.5 A.
Figure 5. Measured Loop Response, TPS54550, VIN = 12 V
The TPS54550EVM-158 output voltage ripple is shown in Figure 6 . The input voltage is VIN = 12 V for the
TPS54550. Output current is the rated full load of 5 A. Voltage is measured directly across output
capacitors.
Figure 6. Measured Output Voltage Ripple, TPS54550
TPS54550EVM-158 SWIFT™ Regulator Evaluation Module6 SLVU151 – March 2006
Submit Documentation Feedback