Datasheet

 
 
 
SLVS519A − MAY 2004 − REVISED OCTOBER 2004
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25
Figure 31
0
100
200
300
400
500
600
700
800
5 6 7 8 9 1011121314151617181920
TPS54357
TPS54356
TPS54355
TPS54354
TPS54353
TPS54352
MAXIMUM SWITCHING FREQUENCY
vs
INPUT VOLTAGE
Maximum Switching Frequency − kHz
V
I
− Input Voltage − V
I
O
> 0.5 A
Figure 32
0
100
200
300
400
500
600
700
800
5 6 7 8 9 1011 121314151617181920
TPS54356
TPS54357
TPS54355
TPS54354
TPS54353
TPS54352
MAXIMUM SWITCHING FREQUENCY
vs
INPUT VOLTAGE
Maximum Switching Frequency − kHz
V
I
− Input Voltage − V
I
O
< 0.1 A
Figure 33
50
75
100
125
150
175
200
225
200 300 400 500 600 700
RT RESISTANCE
vs
SWITCHING FREQUENCY
RT Resistance − kW
Switching Frequency − kHz
Figure 34
3.5
4.0
4.5
5.0
5.5
6.0
6.5
−50 −25 0 25 50 75 100 125 150
VIN(UVLO) START AND STOP
vs
FREE-AIR TEMPERATURE
V
I
− Input Voltage − V
T
A
− Free-Air Temperature − 5C
Start
Start
Stop
Stop
TPS54357
TPS54352−6
Figure 35
3
4
5
6
7
8
9
10
0 5 10 15 20 25
ENABLED SUPPLY CURRENT
vs
INPUT VOLTAGE
Enabled Supply Current − mA
V
I
− Input Voltage − V
T
J
= 25°C
f
S
= 500 kHz
Figure 36
0.9
1.0
1.1
1.2
1.3
0 5 10 15 20 25
DISABLED SUPPLY CURRENT
vs
INPUT VOLTAGE
Disabled Supply Current − mA
V
I
− Input Voltage − V
T
J
= 25°C
Figure 37
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
0 5 10 15 20 25
BIAS VOLTAGE
vs
INPUT VOLTAGE
V
BIAS
− Bias Voltage − V
V
I
− Input Voltage − V
T
J
= 25°C
Figure 38
96.0
96.5
97.0
97.5
98.0
−50 −25 0 25 50 75 100 125 150
POWER GOOD THRESHOLD
vs
JUNCTION TEMPERATURE
PWRGD − Power Good Threshold − %
T
J
− Junction Temperature − 5C
Figure 39
0.8912
0.8910
0.8908
0.8906
0.8904
0.8902
0.8900
0.8898
−50 −25 0 25 50 75 100 125 150
INTERNAL VOLTAGE REFERENCE
vs
JUNCTION TEMPERATURE
V
ref
− Internal Voltage Reference − V
T
J
− Junction Temperature − 5C
VIN = 12 V