SLVS839B – JULY 2008 – REVISED OCTOBER 2008
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TYPICAL CHARACTERISTICS (continued)
VOLTAGE REFERENCE
vs
JUNCTION TEMPERATURE
0.8240
MINIMUM CONTROLLABLE ON
TIME
vs
JUNCTION TEMPERATURE
140
7.50
MINIMUM CONTROLLABLE DUTY
RATIO
vs
JUNCTION TEMPERATURE
VIN = 12 V
7.25
Minimum Controllable Duty Ratio - %
0.8180
Tonmin - Minimum Controllable On Time - ns
VIN = 12 V
130
Vref - Voltage Reference - V
0.8120
0.8060
0.8000
0.7940
0.7880
0.7820
0.7760
-50
7
6.75
6.50
6.25
6
5.75
5.50
-50
120
110
-25
0
25
50
75
100
T
J
- Junction Temperature - °C
125
150
100
-50
-25
0
25
50
75
100
T
J
- Junction Temperature - °C
125
150
-25
0
25
50
75
100
T
J
- Junction Temperature - °C
125
150
Figure 4.
SS CHARGE CURRENT
vs
JUNCTION TEMPERATURE
2.10
Figure 5.
CURRENT LIMIT THRESHOLD
vs
INPUT VOLTAGE
6
T
J
= 150°C
Figure 6.
I
SS
- Slow Start Charge Current -
m
A
Current Limit Threshold - A
T
J
= 25°C
5
T
J
= -40°C
2
4
1.90
-50
3
-25
0
25
50
75
100
125
150
3
8
T
J
- Junction Temperature - °C
13
18
V
I
- Input Voltage - V
23
28
Figure 7.
Figure 8.
SUPPLEMENTAL APPLICATION CURVES
TYPICAL MINIMUM OUTPUT
VOLTAGE
vs
INPUT VOLTAGE
1.25
TYPICAL MAXIMUM OUTPUT
VOLTAGE
vs
INPUT VOLTAGE
30
MAXIMUM POWER DISSIPATION
vs
JUNCTION TEMPERATURE
150
20
I
O
= 2 A
1.05
I
O
= 2 A
T
J
- Junction Temperature - °C
23
28
1.15
25
125
V
O
- Output Voltage - V
V
O
- Output Voltage - V
100
15
0.95
75
10
I
O
= 3 A
0.85
50
5
I
O
= 3 A
0.75
3
8
13
18
V
I
- Input Volatage - V
23
28
0
3
8
13
18
V
I
- Input Voltage - V
25
0
0.2
0.4
0.6
0.8
1
1.2
P
D
- Power Dissipation - W
Figure 9.
Figure 10.
Figure 11.
6
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