NCP1444 View Datasheet(PDF) - ON Semiconductor
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Description
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NCP1444 Datasheet PDF : 20 Pages
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NCP1442, NCP1443, NCP1444, NCP1445
ELECTRICAL CHARACTERISTICS (2.7 V < VCC < 30 V; 0°C < TA < 85°C; 0°C < TJ < 125°C; For all NCP1442/3/4/5 specifications
unless otherwise stated.) (See Note 2)
Characteristic
Test Conditions
Min
Typ
Max Unit
Positive and Negative Error Amplifiers
FB Reference Voltage (NCP1442/4 only)
NFB Reference Voltage (NCP1443/5 only)
FB Input Current (NCP1442/4 only)
NFB Input Current (NCP1443/5 only)
FB Reference Voltage Line Regulation
(NCP1442/4 only)
VC tied to FB; measure at FB
VC = 1.25 V
FB = VREF
NFB = NVREF
VC = FB
1.246 1.276 1.300
V
−2.60 −2.475 −2.40
V
−1.0
0.1
1.0
mA
−16
−10
−5.0
mA
−0.03
0.01
0.03 %/V
NFB Reference Voltage Line Regulation
(NCP1443/5 only)
VC = 1.25 V
−0.05
0.01
Positive Error Amp Transconductance
Negative Error Amp Transconductance
Positive Error Amp Gain
IVC = ± 25 mA
IVC = ± 5.0 mA
(Note 3)
300
550
115
160
200
500
Negative Error Amp Gain
(Note 3)
100
180
VC Source Current
VC Sink Current
VC High Clamp Voltage
VC Low Clamp Voltage
VC Threshold
Oscillator
FB = 1.0 V or NFB = −1.9 V, VC = 1.25 V
FB = 1.5 V or NFB = −3.1 V, VC = 1.25 V
FB = 1.0 V or NFB = −1.9 V; VC sources 25 mA
FB = 1.5 V or NFB = −3.1 V, VC sinks 25 mA
Reduce VC from 1.5 V until switching stops
−90
−50
200
460
1.5
1.64
0.30
0.47
0.70
1.05
Base Operating Frequency
NCP1442/3, FB = 1.0 V or NFB = −1.9 V
240
280
Reduced Operating Frequency
NCP1442/3, FB = 0 V or NFB = 0 V
30
68
Maximum Duty Cycle
NCP1442/3
90
96
Base Operating Frequency
NCP1444/5, FB = 1.0 V or NFB = −1.9 V
480
560
Reduced Operating Frequency
NCP1444/5, FB = 0 V or NFB = 0 V
60
120
Maximum Duty Cycle
NCP1444/5
82
92
FB Frequency Shift Threshold
Frequency drops to reduced operating frequency 0.36
0.40
NFB Frequency Shift Threshold
Frequency drops to reduced operating frequency −0.80 −0.68
Sync/Shutdown
Sync Range
NCP1442/3
−
500
Sync Range
NCP1444/5
−
1000
Sync Pulse Transition Threshold
Rise time = 20 ns
−
2.5
SS Bias Current
SS = 0 V
SS = 3.0 V
−10
−1.0
−
0.2
Shutdown Threshold
−
0.50
0.85
Shutdown Delay
2.7 V ≤ VCC ≤ 12 V
12 V < VCC ≤ 30 V
12
100
12
40
2. For the FR4 suffix parts, production testing is performed at 25°C and 85°C; limits at 0°C are guaranteed by design.
3. Guaranteed by design, not 100% tested in production.
0.05 %/V
800
225
−
320
−25
1500
1.9
0.70
1.30
mMho
mMho
V/V
V/V
mA
mA
V
V
V
320
kHz
120
kHz
−
%
640
kHz
160
kHz
−
%
0.44
V
−0.50
V
−
kHz
−
kHz
−
V
−
mA
4.0
mA
1.20
V
500
ms
400
ms
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