Datasheet

-0.3
0.2
-0.1
0
0.1
0.2
0.3
5 10 15 20
V - Input Voltage - V
IN
Output Voltage Deviation - %
25 30 35 40 45
-60
-40
-20
0
20
60
10 100
Frequency - Hz
Gain - dB
40
-180
-120
-60
0
60
120
180
10000 100000 1000000
Phase - degree
1000
Phase
Gain
-1
-0.8
-0.6
0.4
-0.2
0
0.2
0.4
0.6
1
0 0.5 1.0 1.5 2.0
I - Output Current - A
O
Output Voltage Deviation - %
2.5 3.0
0.8
3.5
TPS54340
SLVSBK0B –OCTOBER 2012–REVISED MARCH 2014 www.ti.com
V
IN
= 12 V V
OUT
= 3.3 V I
OUT
= 3.5 A V
IN
= 12 V V
OUT
= 3.3 V ƒsw = 600 kHz
Figure 53. Overall Loop Frequency Response Figure 54. Regulation vs Load Current
V
OUT
= 3.3 V I
OUT
= 3.5 A ƒsw = 600 kHz
Figure 55. Regulation vs Input Voltage
10 Power Supply Recommendations
The device are designed to operate from an input voltage supply range between 4.5 V and 42 V. This input
supply should be well regulated. If the input supply is located more than a few inches from the TPS54340
converter additional bulk capacitance may be required in addition to the ceramic bypass capacitors. An
electrolytic capacitor with a value of 100 μF is a typical choice.
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