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PDF NCP1234 Data sheet ( Hoja de datos )
| Número de pieza | NCP1234 | |
| Descripción | Fixed Frequency Current Mode Controller | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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NCP1234
Fixed Frequency Current
Mode Controller for Flyback
Converters
The NCP1234 is a new fixed−frequency current−mode controller
featuring Dynamic Self−Supply (DSS). This device is pin−to−pin
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compatible with the previous NCP12xx families.
The DSS 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 transients.
Due to frequency foldback, the controller exhibits excellent
efficiency in light load condition while still achieving very low
SOIC−7
CASE 751U
standby power consumption. Internal frequency jittering, ramp
compensation, and a versatile latch input make this controller an
MARKING DIAGRAM
excellent candidate for converters where components cost is the key
8
constraints.
It features a timer−based fault detection that ensures the detection of
overload independently of an auxiliary winding, and an adjustable
compensation to help keep the maximum power independent of the
input voltage.
Finally, due to a careful design, the precision of critical parameters
is well controlled over the entire temperature range (−40°C to
+125°C).
Features
• Fixed−Frequency Current−Mode Operation with Built−In Ramp
34Xff
ALYWX
G
1
34Xff = 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
Compensation
• 65 kHz or 100 kHz Oscillator Frequency version
PIN CONNECTIONS
• Frequency Foldback then Skip Mode for Maximized Performance in
Latch 1
8 HV
Light Load and Standby Conditions
FB 2
• Timer−Based Overload Protection with Latched (option A) or
Auto−Recovery (option B) Operation
• High−voltage Current Source with Dynamic Self−Supply,
Simplifying the Design of the VCC Capacitor
• Frequency Modulation for Softened EMI Signature, including during
Frequency Foldback mode
• Adjustable Overpower Compensation
CS 3
GND 4
6 VCC
5 DRV
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 32 of this data sheet.
• Latch−off Input for Severe Fault Conditions, Allowing Direct
Connection of an NTC for Overtemperature Protection (OTP)
• VCC Operation up to 28 V, with Overvoltage Detection
• ±500 mA Peak Source/Sink Current Drive Capability
• 4.0 ms Soft−Start
• Internal Thermal Shutdown
• Pin−to−Pin Compatible with the Existing NCP12xx
Series
• These Devices are Pb−Free, Halogen Free/BFR Free
and are RoHS Compliant
Typical Applications
• AC−DC Adapters for Notebooks, LCD, and Printers
• Offline Battery Chargers
• Consumer Electronic Power Supplies
• Auxiliary/Housekeeping Power Supplies
© Semiconductor Components Industries, LLC, 2016
January, 2016 − Rev. 2
1
Publication Order Number:
NCP1234/D
1 page  
NCP1234
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
VCC = 0 V
VCC = VCC(on) − 0.5 V
Istart1
Istart2
0.2 0.5 0.8
369
Off−state leakage current
SUPPLY
VHV = 500 V
Istart(off)
− 25 50
Turn−on threshold level, VCC
going up
HV current source stop threshold
VCC(on)
11.0 12.0 13.0
HV current source restart
threshold
VCC(min)
9.5 10.5 11.5
Turn−off threshold
Overvoltage threshold
Blanking duration on VCC(off) and
VCC(ovp) detection
VCC decreasing level at which
the internal logic resets
VCC(off)
VCC(ovp)
tVCC(blank)
VCC(reset)
8.5 9.5 10.5
25 26.5 28
7 10 13
3.6 5.0 6.0
VCC level for ISTART1 to ISTART2
transition
VCC(inhibit) 0.4 1.0 1.6
Internal current consumption
(Note 6)
OSCILLATOR
DRV open, VFB = 3 V, 65 kHz
DRV open, VFB = 3 V, 100 kHz
Cdrv = 1 nF, VFB = 3 V, 65 kHz
Cdrv = 1 nF, VFB = 3 V, 100 kHz
Off mode (skip or before start−up)
Fault mode (fault or latch)
ICC1
ICC1
ICC2
ICC2
ICC3
ICC4
1.2 1.8 2.2
1.3 1.9 2.3
1.9 2.5 3.2
2.2 2.9 3.6
0.67 0.9 1.13
0.4 0.7 1.0
Oscillator frequency
fOSC
60 65 70
92 100 108
Maximum duty cycle
Frequency jittering amplitude, in
percentage of FOSC
Frequency jittering modulation
frequency
DMAX
Ajitter
Fjitter
75 80 85
±4 ±6 ±8
85 125 165
OUTPUT DRIVER
Rise time, 10% to 90 % of VCC
VCC = VCC(min) + 0.2 V, CDRV = 1 nF
trise − 40 70
Fall time, 90% to 10 % of VCC
VCC = VCC(min) + 0.2 V, CDRV = 1 nF
tfall − 40 70
Current capability
VCC = VCC(min) + 0.2 V, CDRV = 1 nF
DRV high, VDRV = 0 V
DRV low, VDRV = VCC
IDRV(source) − 500 −
IDRV(sink)
− 500 −
Clamping voltage (maximum
gate voltage)
VCC = VCCmax – 0.2 V, DRV high,
RDRV = 33 kW, Cload = 220 pF
VDRV(clamp) 11 13.5 16
High−state voltage drop
VCC = VCC(min) + 0.2 V, RDRV = 33 kW,
VDRV(drop)
−
−
1
DRV high
6. internal supply current only, current in FB pin not included (current flowing in GND pin only).
Unit
V
mA
mA
V
V
V
V
ms
V
V
mA
kHz
%
%
Hz
ns
ns
mA
V
V
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5
5 Page 
NCP1234
TYPICAL PERFORMANCE CHARACTERISTICS
2.65
2.60
2.55
2.50
2.45
2.40
2.35
−50 −25
0 25 50 75
TEMPERATURE (°C)
100
Figure 21. Latch Pin High Threshold VOVP
0.85
0.84
0.83
0.82
0.81
0.80
0.79
0.78
0.77
0.76
0.75
125 −50 −25
0 25 50 75
TEMPERATURE (°C)
100
Figure 22. Latch Pin Low Threshold VOTP
125
1.34 2.80
1.32 2.70
1.30 2.60
1.28 2.50
1.26 2.40
1.24 2.30
1.22 2.20
1.20 2.10
1.18
−50
−25
0 25 50 75
TEMPERATURE (°C)
2.00
100 125
−50 −25
0 25 50 75
TEMPERATURE (°C)
100 125
Figure 23. Latch Pin Open Voltage Vclamp0
Figure 24. Latch Pin Voltage Vclamp1 (Latch−off
Pin is Sinking 1 mA)
110
105
100
95
90
85
80
75
70
−50 −25
0
25 50 75 100 125
TEMPERATURE (°C)
Figure 25. Current INTC Sourced from the
Latch Pin, Allowing Direct NTC Connection
220
210
200
190
180
170
160
150
140
−50 −25
0
25 50 75 100 125
TEMPERATURE (°C)
Figure 26. Current INTC(SSTART) Sourced from
the Latch Pin, During Soft−Start
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11
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| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet NCP1234.PDF ] | |
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