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PDF NCP1248 Data sheet ( Hoja de datos )
| Número de pieza | NCP1248 | |
| Descripción | Fixed Frequency Current Mode Controller | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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NCP1248
Fixed Frequency Current
Mode Controller for Flyback
Converters
The NCP1248 is a new fixed-frequency current-mode controller
featuring the Dynamic Self-Supply. This function greatly simplifies
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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
SOIC−7
line and triggers the X2 discharge current. This HV structure allows
CASE 751U
the brown-out detection as well.
It features a timer-based fault detection that ensures the detection of
MARKING DIAGRAM
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
8
48Axxx
ALYWX
G
1
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.
Features
• Fixed-Frequency Current-Mode Operation using 65 kHz/100 kHz
48Axxx = Specific Device Code
xxx = 065 for 65 kHz
= 100 for 100 kHz
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = Pb-Free Package
Switching Frequency
• Frequency Foldback then Skip Mode for Maximized Performance
PIN CONNECTIONS
in Light Load and Standby Conditions
• Timer-Based Overload Protection with Latched (Option A)
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
Latch
FB
CS
GND
1
2
3
4
8
HV
6
VCC
5
DRV
(Top View)
• Adjustable Overpower Protection Dependant on the Bulk Voltage
• Latch-off Input Combined with the Overpower Protection
Sensing Input
ORDERING INFORMATION
See detailed ordering and shipping information on page 35 of
this data sheet.
• VCC Operation up to 28 V, With Overvoltage Detection
• 500/800 mA Source/Sink Drive Peak Current Capability
Typical Applications
• 10 ms Soft-Start
• AC-DC Adapters for Notebooks, LCD, and Printers
• Internal Thermal Shutdown
• Offline Battery Chargers
• No-Load Standby Power < 30 mW
• Consumer Electronic Power Supplies
• X2 Capacitor in EMI Filter Discharging Feature
• Auxiliary/Housekeeping Power Supplies
• These Devices are Pb-Free and Halogen Free/BFR Free
• Offline Adapters for Notebooks
© Semiconductor Components Industries, LLC, 2014
December, 2014 − Rev. 0
1
Publication Order Number:
NCP1248/D
1 page  
NCP1248
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
−
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
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
Internal current consumption (Note 5)
Cdrv = 1 nF, VFB = 3 V, 65 kHz
Cdrv = 1 nF, VFB = 3 V, 100 kHz
Off mode (skip or before start−up)
ICC2
ICC2
ICC3
1.8 2.6 3.0
2.3 2.9 3.5
0.67 0.9 1.13
Unit
V
mA
mA
mA
V
V
V
V
V
ms
V
V
mA
BROWN−OUT
Fault mode (fault or latch)
ICC4 0.3 0.6 0.9
Brown−Out thresholds
Timer duration for line cycle drop−out
X2 DISCHARGE
VHV going up
VHV going down
VHV(start)
VHV(stop)
tHV
92 101 110 V
84 93 102
43 − 86 ms
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 V
Tsample
− 1.0 − ms
tDET
21 32 43 ms
tDIS 21 32 43 ms
Oscillator frequency
65 kHz
100 kHz
fOSC
58 65 72 kHz
87 100 109
Maximum on time
(TJ = 25°C to +125°C)
fOSC = 65 kHz
fOSC = 100 kHz
tONmax(65kHz)
tONmax(100kHz)
11.5
7.5
12.3
8.0
13.1
8.5
ms
Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product
performance may not be indicated by the Electrical Characteristics if operated under different conditions.
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.
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5
5 Page 
NCP1248
TYPICAL CHARACTERISTIC
100
99
98
97
96
95
94
93
92
91
90
−50 −25
0 25 50 75 100 125
TEMPERATURE (°C)
Figure 21. Oscillator fOSC for the 100 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 23. 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 22. 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)
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| PDF Descargar | [ Datasheet NCP1248.PDF ] | |
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