NCP1927 Datasheet, PDF (1/24 Pages) ON Semiconductor – Combination Power Factor Correction Controller and Flyback Controller for Flat

NCP1927
Combination Power Factor
Correction Controller and
Flyback Controller for Flat
Panel TVs
This combination IC integrates the primary side control blocks −
power factor correction (PFC) and flyback controllers with
sequencing circuitry − necessary to implement a compact highly
efficient Flat Panel TV Switched Mode Power Supply.
The PFC controller exhibits near−unity power factor while
operating in Critical Conduction Mode (CrM) with an internal
frequency clamp. The circuit incorporates all the features necessary
for building a robust and compact PFC stage while minimizing the
number of external components.
The fixed−frequency current−mode flyback controller features a
proprietary Soft−Skip™ mode combined with frequency foldback
enabling excellent efficiency during light load conditions while
achieving very low standby power consumption. Soft−Skip
dramatically reduces the risk of acoustic noise, therefore enabling the
use of inexpensive transformers and capacitors in the clamping
network. Frequency jittering and ramp compensation make this
controller an excellent fit for converters where ruggedness and
component cost are the key constraints.
http://onsemi.com
MARKING DIAGRAM
POVUV
PFB
Shutdown
PControl
PCT
PZCD
SOIC−16
CASE 751B
PCS
GTS
IENABLE
PSKIP
PDRV
VCC
FDRV
GND
FFB
FCS
A = Assembly Location
WL = Wafer Lot
Y = Year
WW = Work Week
G = Pb−Free Package
Common General Features
• Wide V_CC Range from 10 V to 30 V
• Very Low Startup Current Consumption
(v 20 mA MAX)
• Inverter Enable Output
• Shutdown Pin to Disable IC
• Go To Standby Input
• This is a Pb−Free Device
ORDERING INFORMATION
Device
Package
Shipping^†
NCP1927DR2G
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.
PFC Controller Features
• Critical Conduction Mode (CrM) with Constant On
Time Control
• Internal Frequency Clamp
• Skip Mode Operation During Light Load Conditions
• Fast Line / Load Transient Compensation
• Accurate and Programmable Maximum On Time
Control
• Negative Current Sensing
• Programmable Overvoltage/Undervoltage Protection
• 800 mA Source / 1200 mA Sink Gate Drive
Flyback Controller Features
• 65 kHz Fixed−Frequency Operation with Built−In
Ramp Compensation
• Frequency Jittering for Softened EMI Signature
• Frequency Foldback then Soft−Skip for Improved
Performance in Standby
• Timer−Based Overload Protection with Auto−Recovery
• Protection Against Winding Short−Circuit
• 4 ms Soft−Start Timer
• 800 mA Source / 1200 mA Sink Gate Drive
© Semiconductor Components Industries, LLC, 2011
1
June, 2011 − Rev. 0
Publication Order Number:
NCP1927/D