NCP1406
TYPICAL CHARACTERISTICS
0.5
0.4
0.3
0.2
0.1
0
1.1
V
= 25 V
OUT
L1 = 8.2 mH
D1 = MBR0530LT1
C1 = 10 mF
C2 = 3.3 mF
C3 = 82 pF
R1 = 2.2 MW
R2 = 110 kW
1.0
0.9
0.8
0.7
0.6
T = 25°C
A
1
2
3
4
5
6
−50
−25
0
25
50
75
100
100
100
V
, INPUT VOLTAGE (V)
T , AMBIENT TEMPERATURE (°C)
IN
A
Figure 29. No Load Input Current versus
Input Voltage
Figure 30. Current Limit versus
Ambient Temperature
1.4
1.2
1.0
0.8
0.6
0.4
1.4
1.2
1.0
0.8
0.6
0.4
1.8 V
2.0 V
2.4 V
3.0 V
3.7 V
T = 85°C
A
T = 25°C
A
V
= 5.0 V
DD
T = −40°C
A
1
2
3
4
5
−50
−25
0
25
50
6
75
V
IN
, INPUT VOLTAGE (V)
T , AMBIENT TEMPERATURE (°C)
A
Figure 31. Switch−ON Resistance versus
Input Voltage
Figure 32. Switch−ON Resistance versus
Ambient Temperature
1000
800
600
400
200
0
50
40
30
20
10
0
V
DD
V
LX
V
CE
= 3.0 V
= 26 V
= 0 V
V
DD
V
FB
= 3.0 V
= 1.19 V
−50
−25
0
25
50
75
100
−50
−25
0
25
50
75
T , AMBIENT TEMPERATURE (°C)
A
T , AMBIENT TEMPERATURE (°C)
A
Figure 34. Feedback Pin Bias Current versus
Ambient Temperature
Figure 33. LX Pin OFF−State Leakage Current
versus Ambient Temperature
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