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PDF NCP1240 Data sheet ( Hoja de datos )
| Número de pieza | NCP1240 | |
| Descripción | Fixed Frequency Current Mode Controller | |
| Fabricantes | ON Semiconductor | |
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NCP1240
Fixed Frequency Current
Mode Controller for Flyback
Converters
The NCP1240 is a new fixed−frequency current−mode controller
featuring the Dynamic Self−Supply. This function greatly simplifies
the design of the auxiliary supply and the VCC capacitor by activating
the internal startup current source to supply the controller during
start−up, transients, latch, stand−by etc. This device contains a special
HV detector which detect the application unplug from the AC input
line and triggers the X2 discharge current. This HV structure allows
the brown−out detection as well.
It features a timer−based fault detection that ensures the detection of
overload and an adjustable compensation to help keep the maximum
power independent of the input voltage.
Due to frequency foldback, the controller exhibits excellent
efficiency in light load condition while still achieving very low
standby power consumption. Internal frequency jittering, ramp
compensation, and a versatile latch input make this controller an
excellent candidate for the robust power supply designs.
A dedicated Off mode allows to reach the extremely low no load
input power consumption via “sleeping” whole device and thus
minimize the power consumption of the control circuitry.
www.onsemi.com
MARKING
DIAGRAM
SOIC−7
CASE 751U
8
40Xfff
ALYWX
G
1
40Xfff = Specific Device Code
X = A, B, E or F
fff = 065 or 100
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = Pb−Free Package
PIN CONNECTIONS
Features
• Fixed−Frequency Current−Mode Operation (65 kHz and 100 kHz
frequency options)
• Frequency Foldback then Skip Mode for Maximized Performance in
Light Load and Standby Conditions
Latch 1
FB 2
CS 3
GND 4
8 HV
6 VCC
5 DRV
• Timer−Based Overload Protection with Latched (Options A and E) or
(Top View)
Auto−Recovery (Options B and F) Operation
• High−voltage Current Source with Brown−Out Detection and
Dynamic Self−Supply, Simplifying the Design of the VCC Circuitry
• Frequency Modulation for Softened EMI Signature
ORDERING INFORMATION
See detailed ordering and shipping information on page 44 of
this data sheet.
• Adjustable Overpower Protection Dependant on the Bulk Voltage
• Latch−off Input Combined with the Overpower Protection Sensing
Input
• VCC Operation up to 28 V, With Overvoltage Detection
• 500/800 mA Source/Sink Drive Peak Current
Capability
• 10 ms Soft−Start
• Internal Thermal Shutdown
• No−Load Standby Power < 30 mW
• X2 Capacitor in EMI Filter Discharging Feature
Typical Applications
• AC−DC Adapters for Notebooks, LCD, and Printers
• Offline Battery Chargers
• Consumer Electronic Power Supplies
• Auxiliary/Housekeeping Power Supplies
• Offline Adapters for Notebooks
• These Devices are Pb−Free and Halogen Free/BFR Free
© Semiconductor Components Industries, LLC, 2015
July, 2015 − Rev. 1
1
Publication Order Number:
NCP1240/D
1 page  
NCP1240
ELECTRICAL CHARACTERISTICS (For typical values TJ = 25°C, for min/max values TJ = −40°C to +125°C, VHV = 125 V,
VCC = 11 V unless otherwise noted)
Characteristics
Test Condition
Symbol
Min Typ Max
SUPPLY
Blanking Duration on VCC(off) and VCC(ovp)
Detection
tVCC(blank)
−
10
−
VCC Decreasing Level at Which the Internal
Logic Resets
VCC(reset) 4.8 7.0 7.7
VCC Level for ISTART1 to ISTART2 Transition
VCC(inhibit)
0.2
0.8 1.25
Internal Current Consumption (Note 6)
DRV open, VFB = 3 V, 65 kHz
ICC1 1.3 1.85 2.2
DRV open, VFB = 3 V, 100 kHz ICC1 1.3 1.85 2.2
Cdrv = 1 nF, VFB = 3 V, 65 kHz
Cdrv = 1 nF, VFB = 3 V, 100 kHz
ICC2
ICC2
1.8 2.6 3.0
2.0 2.9 3.2
Off mode (skip or before start−up)
ICC3
0.5 0.65 0.8
BROWN−OUT
Fault mode (fault or latch)
ICC4
0.35 0.5
0.7
Brown−Out Thresholds
Timer Duration for Line Cycle Drop−out
X2 DISCHARGE
VHV going up
VHV going down
VHV(start)
VHV(stop)
tHV
102 111
94 103
35 50
120
112
75
Comparator Hysteresis Observed at HV Pin
HV Signal Sampling Period
Timer Duration for No Line Detection
Discharge Timer Duration
OSCILLATOR
VHV(hyst) 1.5 3.5
5
Tsample
− 1.0 −
tDET
43 64 86
tDIS 43 64 86
Oscillator Frequency
fOSC
58 65 72
87 100 109
Maximum On Time for TJ = 25°C to +125°C
Only
Maximum On Time
Maximum Duty Cycle (corresponding to
maximum on time at maximum switching
frequency)
fOSC = 65 kHz
fOSC = 100 kHz
fOSC = 65 kHz
fOSC = 100 kHz
fOSC = 65 kHz
fOSC = 100 kHz
tONmax(65kHz)
tONmax(100kHz)
tONmax(65kHz)
tONmax(100kHz)
DMAX
11.5
7.5
11.3
7.4
−
12.3
8.0
12.3
8.0
80
13.1
8.5
13.1
8.5
−
Frequency Jittering Amplitude, in Percentage
of FOSC
Frequency Jittering Modulation Frequency
FREQUENCY FOLDBACK
Feedback Voltage Threshold Below Which
Frequency Foldback Starts
TJ = 25°C
Ajitter
Fjitter
±3 ±5.5 ±8
85 125 165
VFB(foldS)
2.35
2.5
2.6
Feedback Voltage Threshold Below Which
Frequency Foldback is Complete
TJ = 25°C
VFB(foldE) 1.4 1.5 1.6
Minimum Switching Frequency
(NCP1240A/B)
(NCP1240E/F)
VFB = Vskip(in) + 0.1
fOSC(min)
23 27 32
21 27 32
5. VCC(off) < VCC(min) with the minimum gap 0.5 V.
6. Internal supply current only, currents sourced via FB pin is not included (current is flowing in GND pin only).
7. Guaranteed by design.
8. CS pin source current is a sum of Ibias and IOPC, thus at VHV = 125 V is observed the Ibias only, because IOPC is switched off.
Unit
ms
V
V
mA
V
ms
V
ms
ms
ms
kHz
ms
ms
%
%
Hz
V
V
kHz
www.onsemi.com
5
5 Page 
NCP1240
TYPICAL CHARACTERISTIC
70
65
60
55
50
45
40
35
30
25
20
−50 −25
0 25 50 75 100 125
TEMPERATURE (°C)
Figure 21. Current INTC Sourced from the
Latch Pin, Allowing Direct NTC Connection
120
110
100
90
80
70
60
−50 −25
0 25 50 75 100 125
TEMPERATURE (°C)
Figure 22. Current INTC(SSTART) Sourced from
the Latch Pin, During Soft−Start
100
99
98
97
96
95
94
93
92
91
90−50
−25 0 25 50 75 100
TEMPERATURE (°C)
Figure 23. Oscillator fOSC for the 65 kHz
Version (NCP1240A/B only)
125
8.5
8.4
8.3
8.2
8.1
8.0
7.9
7.8
7.7
7.6
7.5
−50 −25
0 25 50 75 100 125
TEMPERATURE (°C)
Figure 24. Maximum ON Time tONmax for the
65 kHz Version (NCP1240A/B only)
82
81
80
79
78
77
76
75
74
73
72
−50
−25 0 25 50 75 100
TEMPERATURE (°C)
Figure 25. Maximum Duty Ratio DMAX
125
30
29
28
27
26
25
24
23
22
−50 −25
0 25 50 75 100 125
TEMPERATURE (°C)
Figure 26. Minimum Switching Frequency
fOSC(min)
www.onsemi.com
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet NCP1240.PDF ] | |
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