NCP1442, NCP1443, NCP1444, NCP1445
20
V
CC
= 30 V
I
CC
, SUPPLY CURRENT (mA)
V
CC
= 12 V
DI
CC
/
DI
SW
(mA/A)
15
V
CC
= 2.7 V
10
10
8
6
V
CC
= 2.7 V
4
2
DI
SW
= 2.99 A
0
0
20
40
60
80
T
A
, AMBIENT TEMPERATURE (°C)
0
0
20
40
60
80
T
A
, AMBIENT TEMPERATURE (°C)
V
CC
= 30 V
V
CC
= 12 V
12
5
Figure 3. Supply Current versus Temperature
Figure 4.
DI
CC
/
DI
SW
versus Temperature
V
CE(sat)
, SWITCH SATURATION VOLTAGE (mV)
800
f, SWITCHING FREQUENCY (kHz)
700
600
500
400
300
200
100
0
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
I
SW
, SWITCH CURRENT (A)
V
CC
= 2.7 V
T
A
= 25°C
T
A
= 85°C
300
295
290
285
280
275
270
265
260
255
250
0
10
20
30
40
50
60
70
80
T
A
, AMBIENT TEMPERATURE (°C)
Figure 5. Switch Saturation Voltage versus
Switch Current
Figure 6. Switching Frequency versus
Temperature (NCP1442/3 Only)
f, SWITCHING FREQUENCY (% of Typical)
600
f, SWITCHING FREQUENCY (kHz)
595
590
585
580
575
570
565
560
555
550
0
10
20
30
40
50
60
70
80
125
100
T
A
= 25°C
75
T
A
= 85°C
50
25
V
CC
= 12 V
0
0.38 0.39
0.40
0.41
0.42
0.43
0.44
0.45
V
FB
, POSITIVE FEEDBACK VOLTAGE (V)
T
A
, AMBIENT TEMPERATURE (°C)
Figure 7. Switching Frequency versus
Temperature (NCP1444/5 Only)
Figure 8. Switching Frequency versus Positive
Feedback Voltage
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