Datasheet


SLVS456C − OCTOBER 2003 − REVISED OCTOBER 2004
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23
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
4.0
4.5
5.0
5.5
6.0
5.0 7.5 10.0 12.5 15.0 17.5 20.0
CURRENT LIMIT
vs
INPUT VOLTAGE
Current Limit − A
V
I
− Input Voltage − V
T
J
= 25°C
V
I
= 12 V
Figure 40
Figure 41
50
70
90
110
130
150
−50 −25 0 25 50 75 100 125 150
ON RESISTANCE
vs
JUNCTION TEMPERATURE
On Resistance − mW
T
J
− Junction Temperature − 5C
V
I
= 12 V
I
O
= 0.5 A
Figure 42
1
1.25
1.50
1.75
2
100 150 200 250 300
PH Voltage − V
PH VOLTAGE
vs
SUPPLY CURRENT
I
CC
− Supply Current − mA
V
I
= 4.5 V
V
I
= 12 V
Figure 43
0
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
0 1020304050607080
t − Time − ms
Slow Start Capacitance −
SLOW START CAPACITANCE
vs
TIME
Fµ
R
SS
= 2 kΩ
Figure 44
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
250 350 450 550 650 750
Switching Frequency − kHz
Power Good Delay − ms
POWER GOOD DELAY
vs
SWITCHING FREQUENCY
Figure 45
2
3
4
5
6
7
8
9
10
250 350 450 550 650 750
Hiccup Time − ms
HICCUP TIME
vs
SWITCHING FREQUENCY
Switching Frequency − kHz
Figure 46
Switching Frequency − kHz
1
1.5
2
2.5
3
3.5
4
4.5
5
250 350 450 550 650 750
Slow Start Time − ms
INTERNAL SLOW START TIME
vs
SWITCHING FREQUENCY