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NCP1252BDR2G
器件3D模型
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NCP1252BDR2G数据手册
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© Semiconductor Components Industries, LLC, 2011
December, 2011 Rev. 1
1 Publication Order Number:
NCP1611/D
NCP1611
Enhanced, High-Efficiency
Power Factor Controller
The NCP1611 is designed to drive PFC boost stages based on an
innovative Current Controlled Frequency Foldback (CCFF)
method. In this mode, the circuit classically operates in Critical
conduction Mode (CrM) when the inductor current exceeds a
programmable value. When the current is below this preset level, the
NCP1611 linearly decays the frequency down to about 20 kHz when
the current is null. CCFF maximizes the efficiency at both nominal
and light load. In particular, the standby losses are reduced to a
minimum.
Like in FCCrM controllers, internal circuitry allows nearunity
power factor even when the switching frequency is reduced. Housed in
a SO8 package, the circuit also incorporates the features necessary
for robust and compact PFC stages, with few external components.
Features
NearUnity Power Factor
Critical Conduction Mode (CrM)
Current Controlled Frequency Foldback (CCFF): Low Frequency
Operation is Forced at Low Current Levels
Ontime Modulation to Maintain a Proper Current Shaping in CCFF
Mode
Skip Mode Near the Line Zero Crossing
Fast Line / Load Transient Compensation (Dynamic Response
Enhancer)
Valley Turn on
High Drive Capability: 500 mA / +800 mA
V
CC
Range: from 9.5 V to 35 V
Low Startup Consumption
A Version: Low V
CC
Startup Level (10.5 V), B Version: High V
CC
Startup level (17.0 V)
Line Range Detection
This is a PbFree Device
Safety Features
Nonlatching, OverVoltage Protection
BrownOut Detection
SoftStart for Smooth Startup Operation (A version)
Over Current Limitation
Disable Protection if the Feedback Pin is Not Connected
Thermal Shutdown
Low DutyCycle Operation if the Bypass Diode is
Shorted
Open Ground Pin Fault Monitoring
Typical Applications
PC Power Supplies
All Off Line Appliances Requiring Power Factor
Correction
SOIC8
CASE 751
SUFFIX D
PIN CONNECTIONS
MARKING
DIAGRAM
(Top View)
http://onsemi.com
1
8
NCP1611x = Specific Device Code
x = A or B
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = PbFree Package
NCP1611x
ALYW
G
1
8
See detailed ordering and shipping information in the package
dimensions section on page 27 of this data sheet.
ORDERING INFORMATION
Feedback
V
CC
DRV
GND
V
control
V
sense
FF
control
CS/ZCD
1

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