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NCP1280_05 Datasheet(数据表) 1 Page - ON Semiconductor

部件型号  NCP1280
说明  Active Clamp Voltage Mode PWM Controller for Off-Line Applications
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制造商  ONSEMI [ON Semiconductor]
网页  http://www.onsemi.com
标志 ONSEMI - ON Semiconductor

NCP1280 Datasheet(HTML) 1 Page - ON Semiconductor

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© Semiconductor Components Industries, LLC, 2005
February, 2005 − Rev. 3
1
Publication Order Number
NCP1280/D
NCP1280
Active Clamp Voltage Mode
PWM Controller for Off−Line
Applications
The NCP1280 provides a highly integrated solution for off−line
power supplies requiring high−efficiency and low parts count. This
voltage mode controller provides control outputs for driving a forward
converter primary MOSFET and an auxiliary MOSFET for active
clamp circuit. The second output with its programmable delay can also
be used for driving a synchronous rectifier on the secondary or for
asymmetric half bridge circuits. Incorporation of high voltage startup
circuitry (with 700 V capability) reduces parts count and system
power dissipation. Additional features such as line UV/OV protection,
soft−start, single resistor programmable (high) frequency oscillator,
line voltage feedforward, dual mode overcurrent protection and
maximum duty cycle control, allow converter optimization at minimal
cost. Compared to a traditional forward converter, an NCP1280 based
converter can offer significant efficiency improvements and system
cost savings.
Features
Internal High Voltage Startup Regulator (25 V to 700 V)
Dual Control Outputs with Adjustable Overlap Delay
Programmable Maximum Duty Cycle Control
Single Resistor Oscillator Frequency Setting
Fast Line Feedforward
Line Under/Overvoltage Lockout
Dual Mode Overcurrent Protection
Programmable Soft−Start
Precision 5.0 V Reference
Pb−Free Package is Available*
Typical Applications
Off−Line Power Converters in 100−500 W Range
Desktop Power Supplies (High−End)
Industrial Power Supplies
Plasma/LCD TV Front−End
Cclamp
Figure 1. Forward Converter for Off−line Applications Using PFC Inputs
TX1
NCP1280
+
Driver
Opto
Error
Amplifier
Startup
Feedforward
UV/OV
Overlap
Delay
+
FF
OUT1
OUT2
M1
M2
M3
SR Drive
Vin
Vout
Cout
Mclamp
Vin
tD
Lout
NCP1280 = Device Code
A
= Assembly Location
WL
= Wafer Lot
Y
= Year
WW
= Work Week
MARKING
DIAGRAM
16
SO−16
D SUFFIX
CASE 751B
NCP1280
1
1
16
AWLYWW
PIN CONNECTIONS
SS
DCMAX
1
16
VEA
RT
VREF
CSKIP
tD
CS
OUT2
FF
GND
UV/OV
OUT1
NC
VAUX
Vin
http://onsemi.com
See detailed ordering and shipping information in the package
dimensions section on page 4 of this data sheet.
ORDERING INFORMATION
*For additional information on our Pb−Free strategy
and soldering details, please download the
ON Semiconductor Soldering and Mounting
Techniques Reference Manual, SOLDERRM/D.




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