Datasheet

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   
SLUS517C − DECEMBER 2002 − REVISED SEPTEMBER 2005
28
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TYPICAL CHARACTERISTICS
1.0 4.5
0
50
90
70
60
20
10
4.0
40
30
2
80
3.53.02.51.5
100
5.55.0
Figure 24
GT2 MAXIMUM DUTY CYCLE
vs
D_MAX VOLTAGE
GT2 Maximum Duty Cycle − %
D_MAX Voltage − V
100 kHz
200 kHz
500 kHz
800 kHz
Figure 25
1.0
0
200
300
350
50
4.0
150
100
2.0
350
6.
0
MULTIPLIER OUTPUT CURRENT
vs
VOLTAGE ERROR AMPLIFIER OUTPUT
I
MOUT
− Multiplier Output Current − µA
V
AOUT
− Voltage Error Amplifier Output − V
I
AC
= 150 µA
V
FF
= 1.4 V
I
AC
= 300 µA
V
FF
= 2.8 V
I
AC
= 500 µA
V
FF
= 4.7 V
Figure 26
1.0
1.4
1.8
1.6
0.8
4.0
1.2
1.0
2.5
2.0
5.55.04.53.53.02.01.5
MULTIPLIER GAIN
vs
VOLTAGE ERROR AMPLIFIER OUTPUT
Multiplier Gain − K
V
AOUT
− Voltage Error Amplifier Output − V
I
AC
= 500 µA, V
FF
= 4.7 V
I
AC
= 300 µA, V
FF
= 2.8 V
I
AC
= 150 µA, V
FF
= 1.4 V
0
0
200
300
350
50
150
100
2
350
5431
450
400
500
Figure 27
MULTIPLIER
CONSTANT POWER PERFORMANCE
I
MOUT
x V
FF
− µW
V
FF
− Feedforward Voltage − V
V
AOUT
= 5 V
V
AOUT
= 4 V
V
AOUT
= 3 V
V
AOUT
= 2 V