SLVS789A – NOVEMBER 2007 – REVISED FEBRUARY 2008
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EFFICIENCY
vs
OUTPUT CURRENT
100
VIN = 5 V
VOUT = 12 V
90
VOUT = 30 V
80
VOUT = 24 V
VOUT = 18 V
80
90
100
VOUT = 24 V
EFFICIENCY
vs
OUTPUT CURRENT
VIN = 12 V
VIN = 8.5 V
VIN = 5 V
Efficiency - %
Efficiency - %
70
70
60
60
50
50
40
0
50
100
150
200
Output Current - mA
250
300
40
0
50
100
150
200
Output Current - mA
250
300
Figure 2.
OUTPUT VOLTAGE
vs
INPUT VOLTAGE
11.96
I
LOAD
= 100 mA
1600
1500
1400
T
A
= 25°C
Switch Current Limit - A
Figure 3.
SWITCH CURRENT LIMIT
vs
DUTY CYCLE
11.94
V
O
- Output Voltage - V
1300
1200
1100
1000
900
11.92
T
A
= 85°C
T
A
= -40°C
11.90
11.88
3
4
5
6
7
8
V
I
- Input Voltage - V
9
10
11
800
20
30
40
50
60
Duty Cycle - %
70
80
90
Figure 4.
SWITCH CURRENT LIMIT
vs
TEMPERATURE
1600
1500
1400
1300
1200
1100
1000
900
800
-40
Figure 5.
ERROR AMPLIFIER TRANSCONDUCTANCE
vs
TEMPERATURE
Error Amplifier Transconductance - mhos
500
400
Switch Current Limit - mA
300
200
100
-20
0
20
40
60
80
Temperature -
°
C
100
120
140
0
-40
-20
0
20
40
60
80
Temperature -
°
C
100
120
140
Figure 6.
Figure 7.
6
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