NCP1342
High Frequency Quasi-
Resonant Flyback Controller
The NCP1342 is a highly integrated quasi−resonant flyback
controller suitable for designing high−performance off−line power
converters. With an integrated active X2 capacitor discharge feature,
the NCP1342 can enable no−load power consumption below 30 mW.
The NCP1342 features a proprietary valley−lockout circuitry,
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ensuring stable valley switching. This system works down to the 6
valley and transitions to frequency foldback mode to reduce switching
losses. As the load decreases further, the NCP1342 enters quiet−skip
mode to manage the power delivery while minimizing acoustic noise.
To ensure light load performance with high frequency designs, the
NCP1342 incorporates Minimum Peak Current Modulation (MPCM)
to reduce the switching frequency quickly. To help ensure converter
ruggedness, the NCP1342 implements several key protective features
such as internal brownout detection, a non−dissipative Over Power
Protection (OPP) for constant maximum output power regardless of
input voltage, a latched overvoltage and NTC−ready overtemperature
protection through a dedicated pin, and line removal detection to safely
discharge the X2 capacitors when the ac line is removed. If transient
load capability is desired, the NCP1343 offers the same performance
and features with the addition of power excursion mode (PEM).
8
9
1
1
SOIC−9 NB
D SUFFIX
CASE 751BP
SOIC−8 NB
D SUFFIX
CASE 751
MARKING DIAGRAMS
8
9
1
1342abcde
1342abcde
ALYW
ALYW
G
G
1
Features
1342abcde = Specific Device Code
A
L
Y
W
G
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
• Integrated High−Voltage Startup Circuit with Brownout Detection
• Integrated X2 Capacitor Discharge Capability
• Wide V Range from 9 V to 28 V
CC
• 28 V V Overvoltage Protection
CC
• Abnormal Overcurrent Fault Protection for Winding Short Circuit or
Saturation Detection
PIN CONNECTIONS
• Internal Temperature Shutdown
1
Fault
HV
• Valley Switching Operation with Valley−Lockout for Noise−Free
FMAX
FB
ZCD/OPP
CS
Operation
VCC
DRV
GND
• Frequency Foldback with 25 kHz Minimum Frequency Clamp for
Increased Efficiency at Light Loads
• MPCM for Fast Reduction of Switching Frequency at Light Loads
1
HV
Fault
FB
• Skip Mode with Quiet−Skip Technology for Highest Performance
VCC
During Light Loads
DRV
GND
ZCD/OPP
CS
• Minimized Current Consumption for No Load Power Below 30 mW
• Frequency Jittering for Reduced EMI Signature
(Top Views)
• Latching or Auto−Recovery Timer−Based Overload Protection
• Adjustable Overpower Protection (OPP)
ORDERING INFORMATION
See detailed ordering and shipping information on page 3 of
• Adjustable Maximum Frequency Clamp
• Fault Pin for Severe Fault Conditions, NTC Compatible for OTP
• 4 ms Soft−Start Timer
this data sheet.
© Semiconductor Components Industries, LLC, 2017
1
Publication Order Number:
December, 2017 − Rev. 1
NCP1342/D
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