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ON Semiconductor - Combination Power Factor Correction and Quasi- Resonant Flyback Controllers

Numéro de référence NCP1937A3DR2G
Description Combination Power Factor Correction and Quasi- Resonant Flyback Controllers
Fabricant ON Semiconductor 
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NCP1937A3DR2G fiche technique
NCP1937
Combination Power Factor
Correction and Quasi-
Resonant Flyback
Controllers for Adapters
This combination IC integrates power factor correction (PFC) and
quasiresonant flyback functionality necessary to implement a
compact and highly efficient Switched Mode Power Supply for an
adapter application.
The PFC stage exhibits nearunity power factor while operating in a
Critical Conduction Mode (CrM) with a maximum 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 quasiresonant currentmode flyback stage features a
proprietary valleylockout circuitry, ensuring stable valley switching.
This system works down to the 4th valley and toggles to a frequency
foldback mode with a minimum frequency clamp beyond the 4th
valley to eliminate audible noise. Skip mode operation allows
excellent efficiency in light load conditions while consuming very low
standby power consumption.
Common General Features
http://onsemi.com
MARKING DIAGRAM
1
HV/X2
20
PFBHV
BO/X2
SOIC20
Narrow Body
PControl
PONOFF
QCT
CASE 751BS Fault
PSTimer
QFB
PFBLV
GND
PCS/PZCD
PDRV
QDRV
QCS
VCC
QZCD
NCP1937 = Specific Device Code
xx = A1, A2, A3, B1, B2, B3, C1, C4 or C61
A = Assembly Location
WL = Wafer Lot
YY = Year
WW = Work Week
G = PbFree Package
Wide VCC Range from 9 V to 30 V with Builtin Overvoltage
Protection
HighVoltage Startup Circuit and Active Input Filter Capacitor
Discharge Circuitry for Reduced Standby Power
ORDERING INFORMATION
See detailed ordering and shipping information on page 5 of
this data sheet.
Integrated HighVoltage BrownOut Detector
Integrated HighVoltage Switch Disconnects PFC Feedback Resistor
Divider to Reduce Standby Power
Fault Input for Severe Fault Conditions, NTC
FeedForward for Improved Operation across Line and
Compatible (Latch and AutoRecovery Options)
Load
0.5 A / 0.8 A Source / Sink Gate Drivers
Adjustable PFC Disable Threshold Based on Output
Internal Temperature Shutdown
Power
Power Savings Mode Reduces Supply Current
Consumption to 70 mA Enabling Very Low Input Power
Applications
QR Flyback Controller Features
Valley Switching Operation with ValleyLockout for
NoiseFree Operation
PFC Controller Features
Critical Conduction Mode with Constant On Time
Control (Voltage Mode) and Maximum Frequency
Frequency Foldback with Minimum Frequency Clamp
for Highest Performance in Standby Mode
Minimum Frequency Clamp Eliminates Audible Noise
Clamp
Accurate Overvoltage Protection
TimerBased Overload Protection (Latched or
AutoRecovery options)
BiLevel LineDependent Output Voltage
Adjustable Overpower Protection
Fast Line / Load Transient Compensation
Winding and Output Diode ShortCircuit Protection
Boost Diode ShortCircuit Protection
4 ms SoftStart Timer
© Semiconductor Components Industries, LLC, 2013
November, 2013 Rev. 3
1
Publication Order Number:
NCP1937/D

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