NCP1611 View Datasheet(PDF) - ON Semiconductor
Part Name
Description
Manufacturer
NCP1611 Datasheet PDF : 29 Pages
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NCP1611
Enhanced, High-Efficiency
Power Factor Controller
The NCP1611 is designed to drive PFC boost stages based on an
innovative Current Controlled Frequency Fold−back (CCFF)
method. In this mode, the circuit classically operates in Critical
conduction Mode (CrM) when the inductor current exceeds a
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programmable value. When the current is below this preset level, the
NCP1611 linearly decays the frequency down to about 20 kHz when
MARKING
the current is null. CCFF maximizes the efficiency at both nominal
DIAGRAM
and light load. In particular, the stand−by losses are reduced to a
minimum.
Like in FCCrM controllers, internal circuitry allows near−unity
power factor even when the switching frequency is reduced. Housed in
a SO−8 package, the circuit also incorporates the features necessary
for robust and compact PFC stages, with few external components.
Features
• Near−Unity Power Factor
• Critical Conduction Mode (CrM)
• Current Controlled Frequency Fold−back (CCFF): Low Frequency
8
1
SOIC−8
CASE 751
SUFFIX D
8
NCP1611x
ALYW
G
1
NCP1611x = Specific Device Code
x = A or B
A
= Assembly Location
L
= Wafer Lot
Y
= Year
W
= Work Week
G
= Pb−Free Package
Operation is Forced at Low Current Levels
• On−time Modulation to Maintain a Proper Current Shaping in CCFF
Mode
PIN CONNECTIONS
Vcontrol
1
Feedback
• Skip Mode Near the Line Zero Crossing
Vsense
VCC
• Fast Line / Load Transient Compensation (Dynamic Response
FFcontrol
DRV
Enhancer)
CS/ZCD
GND
• Valley Turn on
(Top View)
• High Drive Capability: −500 mA / +800 mA
• VCC Range: from 9.5 V to 35 V
• Low Start−up Consumption
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 28 of this data sheet.
• A Version: Low VCC Start−up Level (10.5 V), B Version: High VCC
Start−up level (17.0 V)
• Line Range Detection
• Configurable for Low Harmonic Content across Wide
• Low Duty−Cycle Operation if the Bypass Diode is
Line/Load Range
Shorted
• EN61000−3−2 Class C Compliant across Wide Load
• Open Ground Pin Fault Monitoring
Range for Dimmable Light Ballasts
• This is a Pb−Free Device
• Saturated Inductor Protection
• Detailed Safety Testing Analysis (Refer to Application
Safety Features
Note AND9064/D)
• Non−latching, Over−Voltage Protection
Typical Applications
• Brown−Out Detection
• PC, TV, Adapters Power Supplies
• Soft−Start for Smooth Start−up Operation (A version)
• LED Drivers and Light Ballasts (including dimmable
• Over Current Limitation
• Disable Protection if the Feedback Pin is Not
Connected
versions)
• All Off−Line Applications Requiring Power Factor
Correction
• Thermal Shutdown
© Semiconductor Components Industries, LLC, 2015
1
January, 2015 − Rev. 4
Publication Order Number:
NCP1611/D
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