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NCP1282 Datasheet(PDF) 5 Page - ON Semiconductor

Part No. NCP1282
Description  High Performance Active Clamp/Reset PWM Controller Featuring 500 V Startup
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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NCP1282 Datasheet(HTML) 5 Page - ON Semiconductor

 
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NCP1282
http://onsemi.com
5
ELECTRICAL CHARACTERISTICS (Vin = 48 V, VAUX = 12 V, VUVOV = 2.3 V, VEA = open, VCSKIP = 0 V, VCS = 0 V, VSS = open,
RT = 13.3 kW, CAUX = 10 mF, CT = 470 pF, Cout1 = Cout2 = 100 pF, CUVOV = 0.01 mF, CCSKIP = 6800 pF, RD = 25 kW, RSYNC = 5.0 kW,
CREF = 0.1 mF, RFF = 29.4 kW, CFF = 470 pF. For typical values TJ = 25°C, for min/max values, TJ is – 40°C to 125°C, unless otherwise noted.)
Characteristic
Symbol
Min
Typ
Max
Unit
STARTUP CONTROL AND VAUX REGULATOR
VAUX Regulation (VUVOV = 0 V)
Inhibit Threshold Voltage
Startup Threshold/VAUX Regulation Peak (VAUX Increasing)
Operating VAUX Valley Voltage
Minimum Operating VAUX Valley Voltage after Turn−On
(VUVOV = 2.3 V, VEA = 0 V)
Vinhibit
VAUX(on)
VAUX(off1)
VAUX(off2)
10.6
8.9
8.0
1.15
11.1
9.4
8.4
1.6
11.6
9.9
9.0
V
Minimum Startup Voltage (Pin 1)
IAUX = 1.0 mA, VAUX = VAUX(on) – 0.2 V
Vstart(min)
23.2
V
Inhibit Bias Current
VAUX = 0 V
Iinhibit
70
171
270
mA
Startup Circuit Output Current
VAUX = Vinhibit + 0.2 V
VAUX = VAUX(on) – 0.2 V
Istart1
Istart2
7.16
4.03
9.3
6.1
11.3
8.1
mA
Startup Circuit Off−State Leakage Current (Vin = 500 V, VUVOV = 0 V)
TJ = 25°C
TJ = –40°C to 125°C
Istart(off)
25
50
100
mA
Startup Circuit Breakdown Voltage (Note 3)
Istart(off) = 50 mA, TJ = 125°C
VBR(DS)
500
V
Auxiliary Supply Current after VAUX Turn−On
Outputs Disabled
VUVOV = 0 V
VEA = 0 V
Outputs Enabled
VEA = 4.0 V
IAUX1
IAUX2
IAUX3
3.1
4.3
4.9
3.6
4.94
7.0
mA
LINE UNDER/OVERVOLTAGE DETECTOR
Undervoltage Threshold (Vin Increasing)
VUV
1.979
2.05
2.116
V
Undervoltage Hysteresis
VUV(H)
0.074
0.093
0.118
V
Undervoltage Ratio (VUV(H)/VUV)
VUV(ratio)
3.65
4.5
5.62
%
Overvoltage Threshold (Vin Increasing)
VOV
2.80
2.95
3.10
V
Overvoltage Hysteresis
VOV(H)
0.075
0.093
0.127
V
Offset Current (VUVOV = 2.8 V)
Ioffset(UVOV)
38
48
58
mA
Offset Current Turn ON Threshold ("5%, Ioffset(UVOV) = 40 mA)
Voffset(UVOV)
2.4
2.6
2.8
V
LINE FEEDFORWARD
Peak Voltage (Volt−Second Clamp)
VFF(peak)
2.8
3.0
3.2
V
Discharge Current (VFF = 0.5 V, VSS = 0 V)
IFF(D)
8.5
mA
Offset Voltage (VFF = 0 V, Ramp Down VSS)
Voffset(FF)
0.118
0.185
0.268
V
Feedforward Offset Minus Soft−Stop Reset Voltage
D(FF−SS)
7
70
183
mV
3. Guaranteed by design only.


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