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NCP1280_05 Datasheet

  • NCP1280_05

  • Active Clamp Voltage Mode PWM Controller for Off-Line Applic...

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NCP1280
Active Clamp Voltage Mode
PWM Controller for Off鈭扡ine
Applications
The NCP1280 provides a highly integrated solution for off鈭抣ine
power supplies requiring high鈭抏fficiency 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鈭抯tart, 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
http://onsemi.com
MARKING
DIAGRAM
16
SO鈭?6
D SUFFIX
CASE 751B
1
1
NCP1280 = Device Code
A
= Assembly Location
WL
= Wafer Lot
Y
= Year
WW
= Work Week
NCP1280
AWLYWW
16
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
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鈭扴tart
Precision 5.0 V Reference
Pb鈭扚ree Package is Available*
Off鈭扡ine Power Converters in 100鈭?00 W Range
Desktop Power Supplies (High鈭扙nd)
Industrial Power Supplies
Plasma/LCD TV Front鈭扙nd
TX1
Startup
+
V
in
鈭?/div>
V
in
UV/OV
FF
Driver
C
clamp
Feedforward
M
clamp
PIN CONNECTIONS
1
V
in
NC
UV/OV
FF
CS
C
SKIP
R
T
DC
MAX
16
V
AUX
OUT1
GND
OUT2
t
D
V
REF
V
EA
SS
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 4 of this data sheet.
Typical Applications
*For additional information on our Pb鈭扚ree strategy
and soldering details, please download the
ON Semiconductor Soldering and Mounting
Techniques Reference Manual, SOLDERRM/D.
L
out
M3
SR Drive
C
out
+
V
out
鈭?/div>
NCP1280
OUT2
OUT1
t
D
M1
M2
Error
Amplifier
Overlap
Delay
Opto
Figure 1. Forward Converter for Off鈭抣ine Applications Using PFC Inputs
漏
Semiconductor Components Industries, LLC, 2005
1
February, 2005 鈭?Rev. 3
Publication Order Number
NCP1280/D

NCP1280_05相關(guān)型號(hào)PDF文件下載

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  • 英文版
    Sub 1.0 V Precision Adjustable Shunt Regulator
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    Sub 1.0 V Precision Adjustable Shunt Regulator
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    Integrated Off-Line Switching Regulator
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    ONSEMI [ON...
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    Integrated Off-Line Switching Regulator
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    ONSEMI [ON...
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    Self-Supplied Monolithic Switcher for Low Standby- Power Off...
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    Self-Supplied Monolithic Switcher for Low Standby- Power Off...
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    Self-Supplied Monolithic Switcher for Low Standby- Power Off...
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    Self-Supplied Monolithic Switcher for Low Standby- Power Off...
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  • 英文版
    Self-Supplied Monolithic Switcher for Low Standby- Power Off...
    ONSEMI [ON...
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    Self-Supplied Monolithic Switcher for Low Standby- Power Off...
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  • 英文版
    Self-Supplied Monolithic Switcher for Low Standby- Power Off...
    ONSEMI [ON...
  • 英文版
    Self-Supplied Monolithic Switcher for Low Standby- Power Off...
    ONSEMI
  • 英文版
    Self-Supplied Monolithic Switcher for Low Standby- Power Off...
    ONSEMI [ON...
  • 英文版
    Self-Supplied Monolithic Switcher for Low Standby- Power Off...
    ONSEMI [ON Semi...

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