NCP1340
High-Voltage,
Quasi-Resonant, Controller
Featuring Valley Lock-Out
Switching
The NCP1340 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 NCP1340 can enable no−load power consumption below 30 mW.
The NCP1340 features a proprietary valley−lockout circuitry,
www.onsemi.com
8
9
1
1
th
ensuring stable valley switching. This system works down to the 6
SOIC−8 NB
D SUFFIX
CASE 751
SOIC−9 NB
D SUFFIX
CASE 751BP
valley and transitions to frequency foldback mode to reduce switching
losses. As the load decreases further, the NCP1340 enters quiet−skip
mode to manage the power delivery while minimizing acoustic noise.
To help ensure converter ruggedness, the NCP1340 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.
MARKING DIAGRAM
9
1340xz
ALYW
G
If transient load capability is desired, the NCP1341 offers the same
performance and features with the addition of power excursion mode
(PEM).
1
1340xz = Specific Device Code
x
z
= A or B
Features
= 1, 2, 3, 4, 5 or 6
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
• Integrated High−Voltage Startup Circuit with Brownout Detection
• Integrated X2 Capacitor Discharge Capability
A
L
Y
W
G
• 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
HV
Fault
• Valley Switching Operation with Valley−Lockout for Noise−Free
Operation
VCC
FB
ZCD/OPP
CS
DRV
GND
• Frequency Foldback with 25 kHz Minimum Frequency Clamp for
Increased Efficiency at Light Loads
1
• Skip Mode with Quiet−Skip Technology for Highest Performance
During Light Loads
Fault
FMAX
FB
HV
• Minimized Current Consumption for No Load Power Below 30 mW
• Frequency Jittering for Reduced EMI Signature
• Latching or Auto−Recovery Timer−Based Overload Protection
• Adjustable Overpower Protection (OPP)
VCC
DRV
GND
ZCD/OPP
CS
(Top Views)
• Fixed or Adjustable Maximum Frequency Clamp
• Fault Pin for Severe Fault Conditions, NTC Compatible for OTP
• 4 ms Soft−Start Timer
ORDERING INFORMATION
See detailed ordering and shipping information n on page 3
of this data sheet.
© Semiconductor Components Industries, LLC, 2017
1
Publication Order Number:
October, 2017 − Rev. 7
NCP1340/D