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SLUS772 – MARCH 2008
TYPICAL CHARACTERISTICS (continued)
OVERCURRENT THRESHOLD
vs
INPUT VOLTAGE
SWITCHING FREQUENCY CHANGE
vs
JUNCTION TEMPERATURE
155
f
OSC
– Switching Frequency Change – %
V
ISNS(OC)
– Overcurrent Threshold – mV
5
4
3
2
1
0
-1
-2
-3
-4
30 V
V
VDD
(V)
4.5 V
12 V
30 V
4.5 V
12 V
154
153
152
151
150
149
148
147
146
145
0
5
10
20
25
30 35
V
VDD
– Input Voltage – V
Figure 9.
OSCILLATOR AMPLITUDE
vs
JUNCTION TEMPERATURE
15
40
45
-5
-40 -25 -10 5 20 35 50 65 80 95 110 125
T
J
– Junction Temperature – ° C
Figure 10.
SOFT-START CHARGE/DISCHARGE RESISTANCE
vs
JUNCTION TEMPERATURE
R
SS
– Soft Start Charge/Discharge Resistance - kW
29
Slope Compensation Ratio (V
VDD
/V
SLP
)
1400
R
SS(DSCH)
Discharge
27
4.5 V
1200
1000
800
25
12 V
23
21
24 V
600
19
36 V
17
V
VDD
(V)
12 V
24 V
36 V
4.5 V
400
200
R
SS(CHG)
Charge
15
-40 -25 -10 5 20 35 50 65 80 95 110 125
T
J
– Junction Temperature – ° C
Figure 11.
0
-40 -25 -10 5 20 35 50 65 80 95 110 125
T
J
– Junction Temperature – ° C
Figure 12.
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