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NCP1282 Datasheet(PDF) 6 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) 6 Page - ON Semiconductor

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NCP1282
http://onsemi.com
6
ELECTRICAL CHARACTERISTICS (continued) (Vin = 48 V, VAUX = 12 V, VUVOV = 2.3 V, VEA = open, VCSKIP = 0 V,
VCS = 0 V, VSS = open, RT = 13.7 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
CURRENT LIMIT AND THERMAL SHUTDOWN
Cycle–by–Cycle Threshold Voltage (Vout = 10 V)
VILIM
476
495
512
mV
Propagation Delay to Output
(VCS = VILIM to 1.0 V, LEB Disabled, Vout = 10 V)
TJ = 25°C
TJ = –40°C to 125°C
tILIM
80
90
110
ns
Thermal Shutdown Threshold (Junction Temperature Increasing, Note 4)
TSHDN
160
°C
Thermal Shutdown Hysteresis (Temperature Decreasing, Note 4)
TH
25
°C
LEADING EDGE BLANKING
Offset Voltage
VLEB(offset)
10
mV
Blanking Time
tLEB
65
75
116
ns
VEA Threshold that Disables LEB (Measured together with tLEB)
VLEB(dis)
4.1
V
CYCLE SKIP CURRENT LIMIT MODE
Charge Current (VCSKIP = 1.25 V)
ICSKIP(C)
66
90
111
mA
Discharge Current (VCSKIP = 1.25 V)
ICSKIP(D)
6.5
8.6
11
mA
Number of Pulses to Exit Cycle Skip Mode
PulseCSKIP
3
Upper Threshold Voltage (Ramp up VCSKIP, VCS = 1.0 V)
VCSKIP(peak)
2.83
3.03
3.24
V
Lower Threshold Voltage (Ramp down VCSKIP)
VCSKIP(valley)
0.39
0.465
0.52
V
Threshold Voltage Hysteresis
VCSKIP(H)
2.5
V
5.0 V REFERENCE
Output Voltage (IREF = 0 mA)
VREF
4.875
5.0
5.075
V
Load Regulation (IREF = 0 to 5.0 mA)
VREF(Load)
16
50
mV
Line Regulation (VAUX = 10.5 to 20 V, IREF = 0 mA)
VREF(line)
8.0
50
mV
Discharge Current (VUVOV = 0 V, VREF = 2.5 V)
IREF(D)
3.8
mA
OSCILLATOR
Frequency
TJ = 25°C ("5%)
TJ = −40°C to 125°C ("7.5%)
fOSC
222
211.2
246
272.2
277.2
kHz
Peak Voltage ("3%)
VRTCT(peak)
2.92
V
Valley Voltage ("3%)
VRTCT(valley)
2.1
V
Discharge Current (VRTCT = 2.3 V)
IRTCT
480
mA
Maximum Operating Frequency (Note 4)
fMAX
1.0
MHz
Duty Cycle (RD = 25 kW)
D
58.8
62.6
65
%
Adjustable Maximum Duty Cycle (Note 4)
DMAX
85
%
4. Guaranteed by design only.


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