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PDF NCP1246 Data sheet ( Hoja de datos )
| Número de pieza | NCP1246 | |
| Descripción | Fixed Frequency Current Mode Controller | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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NCP1246
Product Preview
Fixed Frequency Current
Mode Controller for Flyback
Converters
The NCP1246 is a new fixedïfrequency currentïmode controller
featuring the Dynamic SelfïSupply. 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
startïup, transients, latch, standïby 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 brownïout detection as well.
It features a timerïbased 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
SOICï7
CASE 751U
8
46Xff
ALYWX
G
1
46Xff = Specific Device Code
X = A or B
ff = 65 or 100
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = PbïFree Package
PIN CONNECTIONS
Latch 1
8 HV
Features
FB 2
• FixedïFrequency CurrentïMode Operation (65 kHz and 100 kHz
CS 3
6 VCC
frequency options)
• Frequency Foldback then Skip Mode for Maximized Performance in
Light Load and Standby Conditions
GND 4
5 DRV
(Top View)
• TimerïBased Overload Protection with Latched (option A) or
AutoïRecovery (Option B) Operation
• Highïvoltage Current Source with BrownïOut Detection and
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 37 of this data sheet.
Dynamic SelfïSupply, Simplifying the Design of the VCC Circuitry
• Frequency Modulation for Softened EMI Signature
• NoïLoad Standby Power < 30 mW
• Adjustable Overpower Protection Dependant on the
• X2 Capacitor in EMI Filter Discharging Feature
Bulk Voltage
• Latchïoff 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 SoftïStart
• Internal Thermal Shutdown
• These are PbïFree Devices
Typical Applications
• ACïDC Adapters for Notebooks, LCD, and Printers
• Offline Battery Chargers
• Consumer Electronic Power Supplies
• Auxiliary/Housekeeping Power Supplies
• Offline Adapters for Notebooks
This document contains information on a product under development. ON Semiconductor
reserves the right to change or discontinue this product without notice.
© Semiconductor Components Industries, LLC, 2012
April, 2012 ï Rev. P0
1
Publication Order Number:
NCP1246/D
Free Datasheet http://www.datasheet4u.com/
1 page  
NCP1246
ELECTRICAL CHARACTERISTICS (For typical values TJ = 25°C, for min/max values TJ = ï40°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) ï 30 40
Current flowing out of VCC pin
Offïstate leakage current
Offïmode HV supply current
SUPPLY
VCC = 0 V
VCC = VCC(on) ï 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
ï 45 60
ï 50 70
HV current source regulation threshold
Turnïon threshold level, VCC going up
HV current source stop threshold
VCC(reg)
VCC(on)
8 11 ï
11.0 12.0 13.0
HV current source restart threshold
Turnïoff 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)
7
10 13
VCC decreasing level at which the internal
logic resets
VCC(reset) 4.8 7.0 7.7
VCC level for ISTART1 to ISTART2 transition
Internal current consumption (Note 6)
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
ICC2
ICC2
1.8 2.6 3.0
2.3 2.9 3.5
Off mode (skip or before startïup)
Fault mode (fault or latch)
ICC3
ICC4
0.67 0.9 1.13
0.3 0.6 0.9
BROWNïOUT
BrownïOut thresholds
Timer duration for line cycle dropïout
X2 DISCHARGE
VHV going up
VHV going down
VHV(start)
VHV(stop)
tHV
102 111
94 103
43 ï
120
112
86
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
ï 1.0 ï
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
fOSC = 65 kHz
fOSC = 100 kHz
tONmax(65kHz)
tONmax(100kHz)
11.5
7.5
12.3
8.0
13.1
8.5
Maximum on time
fOSC = 65 kHz
fOSC = 100 kHz
tONmax(65kHz)
tONmax(100kHz)
11.3
7.4
12.3
8.0
13.1
8.5
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
V
mA
mA
mA
V
V
V
V
V
ms
V
V
mA
V
ms
V
ms
ms
ms
kHz
ms
ms
http://onsemi.com
5
Free Datasheet http://www.datasheet4u.com/
5 Page 
NCP1246
TYPICAL CHARACTERISTIC
70
69
68
67
66
65
64
63
62
61
60
ï50
ï25 0 25 50 75 100
TEMPERATURE (°C)
Figure 21. Oscillator fOSC for the 65 kHz
Version
125
12.8
12.7
12.6
12.5
12.4
12.3
12.2
12.1
12.0
11.9
ï50 ï25
0 25 50 75 100 125
TEMPERATURE (°C)
Figure 23. Maximum ON Time tONmax for the
65 kHz Version
85
84
83
82
81
80
79
78
77
76
75
ï50
ï25 0 25 50 75 100
TEMPERATURE (°C)
Figure 25. Maximum Duty Ratio DMAX
125
100
99
98
97
96
95
94
93
92
91
90
ï50 ï25
0 25 50 75 100 125
TEMPERATURE (°C)
Figure 22. Oscillator fOSC for the 100 kHz
Version
8.4
8.3
8.2
8.1
8.0
7.9
7.8
ï50 ï25
0 25 50 75 100 125
TEMPERATURE (°C)
Figure 24. Maximum ON Time tONmax for the
100 kHz Version
30
29
28
27
26
25
24
23
22
ï50 ï25
0 25 50 75
TEMPERATURE (°C)
100 125
Figure 26. Minimum Switching Frequency
fOSC(min)
http://onsemi.com
11
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 38 Páginas | |
| PDF Descargar | [ Datasheet NCP1246.PDF ] | |
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