NCP1280_05 ONSEMI [ON Semiconductor], NCP1280_05 Datasheet - Page 8

• Manufacturer Part Number: NCP1280_05
• Description: Active Clamp Voltage Mode PWM Controller for Off-Line Applications
• Manufacturer: ONSEMI [ON Semiconductor]

160
150
140
130
120
100
120
105
100
110
115
110
7
6
5
4
3
2
1
0
−50
90
95
90
85
80
75
70
−50
−50
Figure 9. Operating Auxiliary Supply Current
Figure 11. Line Under/Overvoltage Thresholds
−25
Figure 13. Current Limit Propagation Delay
Measured from V
Hysteresis versus Junction Temperature
V
−25
−25
AUX
T
f
versus Junction Temperature
J
OSC
T
= 12 V
T
, JUNCTION TEMPERATURE ( C)
versus Junction Temperature
0
J
J
, JUNCTION TEMPERATURE ( C)
, JUNCTION TEMPERATURE ( C)
0
0
= 440 kHz
25
UV HYSTERESIS
OV HYSTERESIS
25
25
OH
to 0.5 V
50
50
50
OH
75
75
75
f
OSC
f
OSC
TYPICAL CHARACTERISTICS
100
V
DC [ 50%
AUX
100
100
= 300 kHz
= 87 kHz
= 12 V
125
http://onsemi.com
125
125
NCP1280
150
150
150
8
600
575
550
525
500
475
450
425
400
450
400
350
300
250
200
150
100
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
50
0
0
−50
−50
−50
Figure 10. Line Under/Overvoltage Thresholds
Figure 12. Current Limit Thresholds versus
−25
−25
−25
Figure 14. Oscillator Frequency versus
T
T
T
versus Junction Temperature
J
J
J
, JUNCTION TEMPERATURE ( C)
, JUNCTION TEMPERATURE ( C)
, JUNCTION TEMPERATURE ( C)
0
0
0
Junction Temperature
Junction Temperature
CYCLE BY CYCLE
CYCLE SKIP
25
25
25
50
50
50
75
75
75
OV THRESHOLD
UV THRESHOLD
R
R
T
R
R
T
100
100
100
T
T
= 101 kW
= 68 kW
= 220 kW
= 390 kW
125
125
125
150
150
150