NCP1651D Datasheet, PDF (1/32 Pages) ON Semiconductor – Single Stage Power Factor Controller

NCP1651
Single Stage Power Factor
Controller
The NCP1651 is an active, power factor correction controller that
can operate over a wide range of input voltages. It is designed for
50/60 Hz power systems. It is a fixed frequency controller that can
operate in continuous or discontinuous conduction modes.
The NCP1651 provides a low cost, low component count solution
for isolated AC--DC converters with mid--high output voltage
requirements. The NCP1651 eases the task of meeting the
IEC1000--3--2 harmonic requirements for converters in the range of
50 W -- 250 W.
The NCP1651 drives a flyback converter topology to operate in
continuous/discontinuous mode and programs the average input
current to follow the line voltage in order to provide unity power
factor. By using average current mode control CCM algorithm, the
NCP1651 can help provide excellent power factor while limiting the
peak primary current. Also, the fixed frequency operation eases the
input filter design.
The NCP1651 uses a proprietary multiplier design that allows for
much more accurate operation than with conventional analog
multipliers.
Features
 Fixed Frequency Operation
 Average Current Mode PWM
 Internal High Voltage Startup Circuit
 Continuous or Discontinuous Mode Operation
 High Accuracy Multiplier
 Overtemperature Shutdown
 External Shutdown
 Undervoltage Lockout
 Low Cost/Parts Count Solution
 Ramp Compensation Does Not Affect Oscillator Accuracy
 This is a Pb--Free Device
Typical Applications
 High Current Battery Chargers
 Front Ends for Distributed Power Systems
http://onsemi.com
MARKING
DIAGRAM
16
1
SOIC--16
D SUFFIX
CASE 751B
NCP1651G
AWLYWW
A
= Assembly Location
WL = Wafer Lot
Y
= Year
WW = Work Week
G
= Pb--Free Package
PIN CONNECTIONS
OUT 1
GND 2
C_T 3
RAMP COMP 4
I_{S+ 5}
I_avg--fltr 6
I_avg 7
FB/SD 8
16 STARTUP
15 NC
14 NC
13 V_CC
12 V_ref
11 AC COMP
10 AC REF
9 AC INPUT
(Top View)
ORDERING INFORMATION
Device
Package
Shipping^†
NCP1651DR2G 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 Specifications
Brochure, BRD8011/D.
 Semiconductor Components Industries, LLC, 2010
1
December, 2010 -- Rev. 9
Publication Order Number:
NCP1651/D