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NCP1282 Datasheet(PDF) 1 Page - ON Semiconductor

Part No. NCP1282
Description  High Performance Active Clamp/Reset PWM Controller Featuring 500 V Startup
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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NCP1282 Datasheet(HTML) 1 Page - ON Semiconductor

 
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© Semiconductor Components Industries, LLC, 2006
December, 2006 − Rev. 0
1
Publication Order Number:
NCP1282/D
NCP1282
High Performance Active
Clamp/Reset PWM Controller
Featuring 500 V Startup
The NCP1282 is a voltage mode controller designed for ac−dc or
dc−dc converters requiring high−efficiency and low parts count. This
controller incorporates two in phase outputs with an overlap delay to
prevent simultaneous conduction and facilitates soft switching. The
main output is designed for driving a forward converter primary
MOSFET. The secondary output is designed for driving an active
clamp circuit MOSFET, a synchronous rectifier on the secondary
side, or an asymmetric half bridge circuit.
The NCP1282 reduces component count and system size by
incorporating high accuracy on critical specifications such as
maximum duty cycle limit, undervoltage detector and overcurrent
threshold. Two distinctive features of the NCP1282 are soft−stop and
a cycle skip current limit with a time threshold. Soft−stop circuitry
powers down the converter in a controlled manner if a severe fault is
detected. The cycle skip detector enables a soft−stop sequence if a
continuous overcurrent condition is present.
Additional features found in the NCP1282 include line feed−
forward, frequency synchronization up to 1.0 MHz, cycle−by−cycle
current limit with leading edge blanking (LEB), independent under
and overvoltage detectors, adjustable output overlap delay,
programmable maximum duty cycle, internal startup circuit and
soft−start.
Features
Dual Control Outputs with Adjustable Overlap Delay
>2.0 A Output Drive Capability
Soft−Stop Powers Down Converter in a Controlled
Manner
Cycle−by−Cycle Current Limit
Cycle Skip Initiated if Continuous Current Limit
Condition Exists
Voltage Mode Operation with Input Voltage
Feedforward
Fixed Frequency Operation up to 1.0 MHz
Bidirectional Frequency Synchronization
Independent Line Undervoltage and Overvoltage
Detectors
Minimum Operating Voltage of 8.5 V Ensures Enough
Voltage is Available for Driving High Voltage MOSFETs
Accurate Programmable Maximum Duty Cycle Limit
Programmable Maximum Volt−Second Product
Programmable Soft−Start
Internal 500 V Startup Circuit
Precision 5.0 V Reference
This is a Pb−Free Device*
Typical Applications
High Power Consumer Electronics
High Power AC−DC Converters
High Power DC−DC Converters
ATX Power Supplies
*For additional information on our Pb−Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques Reference
Manual, SOLDERRM/D.
A
= Assembly Location
WL, L = Wafer Lot
Y
= Year
WW, W = Work Week
G
= Pb−Free Package
MARKING
DIAGRAM
http://onsemi.com
SO−16
D SUFFIX
CASE 751B
NCP1282BG
AWLYWW
Device
Package
Shipping
ORDERING INFORMATION
NCP1282BDR2G
SO−16
(Pb−Free)
2500 / Tape & Reel
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specifications
Brochure, BRD8011/D.


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