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NCP1631
Interleaved, 2-Phase Power
Factor Controller
The NCP1631 integrates a dual MOSFET driver for interleaved
PFC applications. Interleaving consists of paralleling two small
stages in lieu of a bigger one, more difficult to design. This approach
has several merits like the ease of implementation, the use of smaller
components or a better distribution of the heating.
Also, Interleaving extends the power range of Critical Conduction
Mode that is an efficient and cost ? effective technique (no need for
http://onsemi.com
MARKING DIAGRAM
low t rr diodes). In addition, the NCP1631 drivers are 180 ° phase shift
for a significantly reduced current ripple.
Housed in a SOIC16 package, the circuit incorporates all the
features necessary for building robust and compact interleaved PFC
stages, with a minimum of external components.
SOIC ? 16
D SUFFIX
CASE 751B
A
WL
NCP1631G
AWLYWWG
= Assembly Location
= Wafer Lot
1
General Features
? Near ? Unity Power Factor
? Substantial 180 ° Phase Shift in All Conditions Including Transient
Phases
? Frequency Clamped Critical Conduction Mode ( FCCrM ) i.e.,
Fixed Frequency, Discontinuous Conduction Mode Operation with
Y = Year
WW = Work Week
G = Pb ? Free Package
PIN ASSIGNMENT
ZCD2 ZCD1
FB REF5V/pfcOK
?
?
?
?
?
?
?
?
Critical Conduction Achievable in Most Stressful Conditions
FCCrM Operation Optimizes the PFC Stage Efficiency Over the
Load Range
Out ? of ? phase Control for Low EMI and a Reduced rms Current in
the Bulk Capacitor
Frequency Fold ? back at Low Power to Further Improve the Light
Load Efficiency
Accurate Zero Current Detection by Auxiliary Winding for Valley
Turn On
Fast Line / Load Transient Compensation
High Drive Capability: ? 500 mA / +800 mA
Signal to Indicate that the PFC is Ready for Operation (“pfcOK”
Pin)
V CC Range: from 10 V to 20 V
Rt DRV1
OSC GND
Vcontrol Vcc
FFOLD DRV2
BO Latch
OVP / UVP CS
(Top View)
ORDERING INFORMATION
Device Package Shipping ?
NCP1631DR2G SOIC ? 16 2500 / Tape & Reel
(Pb ? Free)
?For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specification
Brochure, BRD8011/D.
Safety Features
? Output Over and Under Voltage Protection
? Brown ? Out Detection with a 50 ? ms Delay to Help
Meet Hold ? up Time Specifications
? Soft ? Start for Smooth Start ? up Operation
? Programmable Adjustment of the Maximum Power
? Over Current Limitation
? Detection of Inrush Currents
Typical Applications
? Computer Power Supplies
? LCD / Plasma Flat Panels
? All Off Line Appliances Requiring Power Factor
Correction
*For additional information on our Pb ? Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques Reference
Manual, SOLDERRM/D.
? Semiconductor Components Industries, LLC, 2013
February, 2013 ? Rev. 3
1
Publication Order Number:
NCP1631/D
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