Datasheet

V = 20 mV/div (ac coupled)
OUT
Time = 500 ns/div
PH = 2 V/div
V = 100 mV/div (ac coupled)
IN
Time = 500 ns/div
PH = 2 V/div
-0.2
-0.15
-0.1
-0.05
0
0.05
0.1
0.15
0.2
Output Current - A
Output Voltage Deviation - %
V = 5 V
IN
V = 3.3 V
IN
0 0.5 1 1.5 2 2.5 3 3.5 4
-60
-50
-40
-30
-20
-10
0
10
20
30
40
50
60
f - Frequency - Hz
Gain - dB
-180
-150
-120
-90
-60
-30
0
30
60
90
120
150
180
Phase - Degrees
Gain
Phase
10 100 1k 10k 100k 1M
I = 5 A/div
OUT
Time = 1 ms/div
V = 1 V/div
OUT
-0.1
-0.08
-0.06
-0.04
-0.02
0
0.02
0.04
0.06
0.08
0.1
Input Voltage - V
Output Voltage Deviation - %
I = 2 A
OUT
3 3.5 4 4.5 5 5.5 6
TPS54478
www.ti.com SLVSAS2 –JUNE 2011
Figure 45. OUTPUT RIPPLE, I
OUT
= 4 A Figure 46. INPUT RIPPLE, I
OUT
= 4 A
Figure 47. CLOSED LOOP RESPONSE, V
IN
= 5 V, Figure 48. OUTPUT VOLTAGE REGULATION vs
I
OUT
= 4 A LOAD CURRENT
Figure 49. OUTPUT VOLTAGE REGULATION vs Figure 50. HICCUP MODE CURRENT LIMIT
INPUT VOLTAGE
Copyright © 2011, Texas Instruments Incorporated 29