NCP1280_05 Datasheet, PDF (7/18 Pages) ON Semiconductor – Active Clamp Voltage Mode PWM Controller for Off-Line Applications

NCP1280
TYPICAL CHARACTERISTICS
12
11
STARTUP
10
THRESHOLD
9
8
7
MINIMUM
6
OPERATING
THRESHOLD
5
−50 −25 0 25 50 75 100 125 150
T_J, JUNCTION TEMPERATURE (°C)
Figure 3. Auxiliary Supply Voltage Thresholds
versus Junction Temperature
17.0
16.5
16.0
V_in = 82 V
15.5
15.0
14.5
14.0
13.5
13.0
0
2
4
6
8
10
12
V_AUX, AUXILIARY SUPPLY VOLTAGE (V)
Figure 5. Startup Circuit Output Current
versus Auxiliary Supply Voltage
50
45 ^{VAUX = 12 V}
40
T_J = −40°C
35
30
T_J = 25°C
25
20
T_J = 125°C
15
10
5
0
0 100 200 300 400 500 600 700 800 900
V_in, LINE VOLTAGE (V)
Figure 7. Startup Circuit Off−State Leakage
Current versus Line Voltage
19
18
V_in = 82 V
17
16
15
V_AUX = 0 V
14
13
12
V_AUX = V_AUX(on) − 0.2 V
11
10
9
−50 −25 0 25 50 75 100 125 150
T_J, JUNCTION TEMPERATURE (°C)
Figure 4. Startup Circuit Output Current
versus Junction Temperature
20
16
T_J = −40°C
12
T_J = 25°C
8
T_J = 125°C
4
V_AUX = V_AUX(on) − 0.2 V
0
0 100 200 300 400 500 600 700
V_in, LINE VOLTAGE (V)
Figure 6. Startup Circuit Output Current
versus Line Voltage
4.0
3.5
V_AUX = 12 V
3.0
V_EA = 0 V
2.5
2.0
1.5
V_UV/OV = 0 V
1.0
0.5
0
−50 −25 0 25 50 75 100 125 150
T_J, JUNCTION TEMPERATURE (°C)
Figure 8. Auxiliary Supply Current versus
Junction Temperature
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