TPS65163
SLVSA28 –OCTOBER 2009
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BUCK CONVERTER EFFICIENCY
100
90
80
70
60
50
40
30
20
BUCK CONVERTER LOAD TRANSIENT RESPONSE
I
= 250mA TO 500mA
LOGIC
V
LOGIC
I
LOGIC
V
V
= 12 V,
LOGIC
10
0
= -7 V,
GL
I
= 50 mA
GL
0
0.25
0.5
0.75
1
1.25
1.5
I
- Output Current - A
O
Figure 7.
Figure 8.
BUCK CONVERTER LINE TRANSIENT RESPONSE
BUCK CONVERTER OUTPUT VOLTAGE RIPPLE
= 500 mA
V
= 11.5 V TO 12.5 V
I
LOGIC
IN
V
V
I
= 3.3 V
LOGIC
V
IN
= -7 V
GL
= 50 mA
GL
V
LOGIC
V
= 3.3 V
LOGIC
I
= 500 mA
LOGIC
V
I
= -7 V
GL
= 50 mA
GL
V
LOGIC
Figure 9.
Figure 10.
BUCK CONVERTER SWITCH NODE WAVEFORM
DISCONTINUOUS CONDUCTION MODE
BUCK CONVERTER SWITCH NODE WAVEFORM
CONTINUOUS CONDUCTION MODE
V
I
= 3.3 V
V
I
= 3.3 V
LOGIC
LOGIC
= 50 mA
= 250 mA
LOGIC
LOGIC
V
SWB
V
SWB
I
INDUCTOR
I
INDUCTOR
Figure 11.
Figure 12.
10
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