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PDF NCP1244 Data sheet ( Hoja de datos )
| Número de pieza | NCP1244 | |
| Descripción | Fixed Frequency Current Mode Controller | |
| Fabricantes | ON Semiconductor | |
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NCP1244
Fixed Frequency Current
Mode Controller for Flyback
Converters
The NCP1244 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.
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.
http://onsemi.com
MARKING
DIAGRAM
SOIC−7
CASE 751U
8
44Xff
ALYWX
G
1
44Xff = Specific Device Code
X = A or B
ff = 65 or 100
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = Pb−Free Package
Features
PIN CONNECTIONS
• 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
• Timer−Based Overload Protection with Latched (Option A) or
Latch 1
FB 2
CS 3
GND 4
8 HV
6 VCC
5 DRV
Auto−Recovery (Option B) Operation
(Top View)
• High−voltage Current Source with Dynamic Self−Supply,
Simplifying the Design of the VCC Circuitry
• Frequency Modulation for Softened EMI Signature
• Adjustable Overpower Protection Dependant on the Bulk Voltage
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 39 of this data sheet.
• 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
Typical Applications
• AC−DC Adapters for Notebooks, LCD, and Printers
• Offline Battery Chargers
• 10 ms Soft−Start
• Consumer Electronic Power Supplies
• Internal Thermal Shutdown
• Auxiliary/Housekeeping Power Supplies
• No−Load Standby Power < 30 mW
• Offline Adapters for Notebooks
• X2 Capacitor in EMI Filter Discharging Feature
• These Devices are Pb−Free and Halogen Free/BFR Free
© Semiconductor Components Industries, LLC, 2012
December, 2012 − Rev. 0
1
Publication Order Number:
NCP1244/D
Free Datasheet http://www.datasheet4u.com/
1 page  
NCP1244
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
HIGH VOLTAGE CURRENT SOURCE
Minimum voltage for current source
operation
VHV(min) − 30 40
Current flowing out of VCC pin
Off−state leakage current
Off−mode HV supply current
SUPPLY
VCC = 0 V
VCC = VCC(on) − 0.5 V
VHV = 500 V, VCC = 15 V
VHV = 141 V,
VHV = 325 V,
VCC loaded by 4.7 mF cap
Istart1
Istart2
Istart(off)
IHV(off)
0.2 0.5 0.8
5 8 11
10 25 50
− 45 60
− 50 70
HV current source regulation threshold
Turn−on threshold level, VCC going up
HV current source stop threshold
VCC(reg)
VCC(on)
8 11 −
11.0 12.0 13.0
HV current source restart threshold
Turn−off threshold
Overvoltage threshold
Blanking duration on VCC(off) and VCC(ovp)
detection
VCC(min)
9.5 10.5 11.5
VCC(off)
8.5 8.9 9.3
VCC(ovp)
25 26.5 28
tVCC(blank)
−
10
−
VloCgCic
decreasing
resets
level
at
which
the
internal
VCC(reset) 4.8 7.0 7.7
VCC level for ISTART1 to ISTART2 transition
Internal current consumption (Note 5)
VCC(inhibit)
0.2
0.8 1.25
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
IICCCC22
1.8 2.6 3.0
2.3 2.9 3.5
Off mode (skip or before start−up)
Fault mode (fault or latch)
ICC3
ICC4
0.67 0.9 1.13
0.3 0.6 0.9
X2 DISCHARGE
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
21 32 43
tDIS 21 32 43
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
−
5. Internal supply current only, currents sourced via FB pin is not included (current is flowing in GND pin only).
6. Guaranteed by design.
7. 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
V
mA
mA
mA
V
V
V
V
V
ms
V
V
mA
V
ms
ms
ms
kHz
ms
ms
%
http://onsemi.com
5
Free Datasheet http://www.datasheet4u.com/
5 Page 
NCP1244
TYPICAL CHARACTERISTIC
12.8
12.7
12.6
12.5
12.4
12.3
12.2
12.1
12.0
11.9
−50 −25
0 25 50 75 100 125
TEMPERATURE (°C)
Figure 21. Maximum ON Time tONmax for the
65 kHz Version
8.4
8.3
8.2
8.1
8.0
7.9
7.8
−50 −25
0 25 50 75 100 125
TEMPERATURE (°C)
Figure 22. Maximum ON Time tONmax for the
100 kHz Version
85
84
83
82
81
80
79
78
77
76
75
−50
−25 0 25 50 75 100
TEMPERATURE (°C)
Figure 23. Maximum Duty Ratio DMAX
125
30
29
28
27
26
25
24
23
22
−50 −25
0 25 50 75
TEMPERATURE (°C)
100 125
Figure 24. Minimum Switching Frequency
fOSC(min)
2.20
2.15
2.10
2.05
2.00
1.95
1.90
1.85
1.80
−50
−25 0 25 50 75 100
TEMPERATURE (°C)
Figure 25. FB Pin Voltage Below Which
Frequency Foldback Starts VFB(foldS)
125
1.00
0.98
0.96
0.94
0.92
0.90
0.88
0.86
0.84
0.82
0.80
−50
−25 0 25 50 75 100
TEMPERATURE (°C)
Figure 26. FB Pin Voltage Below Which
Frequency Foldback Complete VFB(foldE)
125
http://onsemi.com
11
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet NCP1244.PDF ] | |
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