NCP1927 ,NCP1927: Combination Power Factor Correction Controller and Flyback Controller for Flat Panel TV3PFC FAULT MANAGEMENTV & LATCH MANAGEMENTCCNCP1927PIN FUNCTION DESCRIPTIONPin No. Pin Name Pin Desc ..
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NCP1927
NCP1927: Combination Power Factor Correction Controller and Flyback Controller for Flat Panel TV
NCP1927
Combination Power Factor
Correction Controller and
Flyback Controller for Flat
Panel TVs
This combination IC integrates the primary side control blocks ï
power factor correction (PFC) and flyback controllers with
sequencing circuitry ï necessary to implement a compact highly
efficient Flat Panel TV Switched Mode Power Supply.
The PFC controller exhibits nearïunity 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 fixedïfrequency currentïmode flyback controller features a
proprietary SoftïSkip mode combined with frequency foldback
enabling excellent efficiency during light load conditions while
achieving very low standby power consumption. SoftïSkip
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.
Common General Features Wide VCC Range from 10 V to 30 V Very Low Startup Current Consumption
( 20 A MAX) Inverter Enable Output Shutdown Pin to Disable IC Go To Standby Input This is a PbïFree Device
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 FixedïFrequency Operation with BuiltïIn
Ramp Compensation Frequency Jittering for Softened EMI Signature Frequency Foldback then SoftïSkip for Improved
Performance in Standby TimerïBased Overload Protection with AutoïRecovery Protection Against Winding ShortïCircuit 4 ms SoftïStart Timer 800 mA Source / 1200 mA Sink Gate Drive
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SOICï16
CASE 751B
MARKING DIAGRAM
POVUV
PFB
Shutdown
PControl
PCT
PZCD
PCS
GTS
IENABLE
PSKIP
PDRV
VCC
FDRV
GND
FFB
FCS = Assembly Location = Wafer Lot = Year = Work Week = PbïFree Package
Device Package Shipping
ORDERING INFORMATION
NCP1927DR2G SOICï16
(PbïFree)
2500 / Tape & Reel
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.
