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NCP1280DR2 Datasheet(PDF) 9 Page - ON Semiconductor

Part # NCP1280DR2
Description  Active Clamp Voltage Mode PWM Controller for Off-Line Applications
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP1280DR2 Datasheet(HTML) 9 Page - ON Semiconductor

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NCP1280
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9
TYPICAL CHARACTERISTICS
TJ, JUNCTION TEMPERATURE (°C)
125
100
75
50
25
0
−25
−50
3.0
3.5
4.0
4.5
5.0
5.5
6.5
7.0
150
6.0
30
35
40
45
50
55
65
70
60
CHARGE
DISCHARGE
Figure 15. Oscillator Frequency versus
Junction Temperature
Figure 16. Oscillator Frequency versus
Timing Resistor
RT, TIMING RESISTOR (kW)
400
300
250
200
150
100
50
0
100
200
300
400
600
500
350
TJ, JUNCTION TEMPERATURE (°C)
125
100
75
50
25
0
−25
−50
285
290
295
300
305
310
150
315
RT = 101 kW
TJ = 25°C
DC
[ 50%
525
450
225
150
75
0
0
10
20
40
60
90
375
300
30
50
TJ = −40°C
TJ = 125°C
80
70
VEA = 3.0 V
VDCMAX = 0 V
TJ, JUNCTION TEMPERATURE (°C)
150
125
100
75
0
−25
−50
50
60
70
80
90
100
50
25
RP = OPEN, RMDP = OPEN
RP = 0 W, RMDP = OPEN
RFF = 1.0 MW
Figure 17. Feedforward Internal Resistance
versus Junction Temperature
150
125
100
75
0
−25
−50
9
10
11
12
13
14
15
19
17
50
25
16
18
Figure 18. Maximum Duty Cycle versus
Feedforward Current
Figure 19. Maximum Duty Cycle versus
Junction Temperature
Figure 20. Soft Start Charge/Discharge
Currents versus Junction Temperature
TJ, JUNCTION TEMPERATURE (°C)
IFF, FEEDFORWARD CURRENT (mA)


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