NCP1282 Ver la hoja de datos (PDF) - ON Semiconductor
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NCP1282 Datasheet PDF : 23 Pages
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NCP1282
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)
Propagation Delay to Output
(VCS = VILIM to 1.0 V, LEB Disabled, Vout = 10 V)
TJ = 25°C
TJ = –40°C to 125°C
Thermal Shutdown Threshold (Junction Temperature Increasing, Note 4)
Thermal Shutdown Hysteresis (Temperature Decreasing, Note 4)
LEADING EDGE BLANKING
VILIM
tILIM
TSHDN
TH
476
495
512
mV
ns
–
80
90
–
–
110
–
160
–
°C
–
25
–
°C
Offset Voltage
Blanking Time
VEA Threshold that Disables LEB (Measured together with tLEB)
CYCLE SKIP CURRENT LIMIT MODE
VLEB(offset)
–
10
–
mV
tLEB
65
75
116
ns
VLEB(dis)
4.1
–
–
V
Charge Current (VCSKIP = 1.25 V)
Discharge Current (VCSKIP = 1.25 V)
Number of Pulses to Exit Cycle Skip Mode
Upper Threshold Voltage (Ramp up VCSKIP, VCS = 1.0 V)
Lower Threshold Voltage (Ramp down VCSKIP)
Threshold Voltage Hysteresis
5.0 V REFERENCE
ICSKIP(C)
66
90
111
mA
ICSKIP(D)
6.5
8.6
11
mA
PulseCSKIP
–
3
–
−
VCSKIP(peak)
2.83
3.03
3.24
V
VCSKIP(valley)
0.39
0.465
0.52
V
VCSKIP(H)
–
2.5
–
V
Output Voltage (IREF = 0 mA)
Load Regulation (IREF = 0 to 5.0 mA)
Line Regulation (VAUX = 10.5 to 20 V, IREF = 0 mA)
Discharge Current (VUVOV = 0 V, VREF = 2.5 V)
OSCILLATOR
VREF
4.875
5.0
5.075
V
VREF(Load)
–
16
50
mV
VREF(line)
–
8.0
50
mV
IREF(D)
3.8
–
–
mA
Frequency
TJ = 25°C ("5%)
TJ = −40°C to 125°C ("7.5%)
Peak Voltage ("3%)
Valley Voltage ("3%)
Discharge Current (VRTCT = 2.3 V)
Maximum Operating Frequency (Note 4)
Duty Cycle (RD = 25 kW)
Adjustable Maximum Duty Cycle (Note 4)
4. Guaranteed by design only.
fOSC
VRTCT(peak)
VRTCT(valley)
IRTCT
fMAX
D
DMAX
222
211.2
−
−
−
1.0
58.8
85
246
–
2.92
2.1
480
–
62.6
−
272.2
277.2
−
−
−
–
65
−
kHz
V
V
mA
MHz
%
%
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