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NCP1380_12 Datasheet, PDF (1/26 Pages) ON Semiconductor – Quasi-Resonant Current-Mode Controller for High-Power Universal Off-Line Supplies | |||
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NCP1380
Quasi-Resonant
Current-Mode Controller for
High-Power Universal
Off-Line Supplies
The NCP1380 hosts a highâperformance circuitry aimed to
powering quasiâresonant converters. Capitalizing on a proprietary
valleyâlockout system, the controller shifts gears and reduces the
switching frequency as the power loading becomes lighter. This
results in a stable operation despite switching events always occurring
in the drainâsource valley. This system works down to the 4th valley
and toggles to a variable frequency mode beyond, ensuring an
excellent standby power performance.
To improve the safety in overload situations, the controller includes
an Over Power Protection (OPP) circuit which clamps the delivered
power at highâline. Safetyâwise, a fixed internal timer relies on the
feedback voltage to detect a fault. Once the timer elapses, the
controller stops and stays latched for option A and C or enters
autoârecovery mode for option B and D.
Particularly well suited for adapter applications, the controller
features a pin to implement either a combined overvoltage /
overtemperature protection (Version A and B) or a combined
brownâout/overvoltage protection (Version C and D).
Features
⢠QuasiâResonant Peak CurrentâMode Control Operation
⢠Valley Switching Operation with ValleyâLockout for NoiseâImmune
Operation
⢠Frequency Foldback at Light Load to Improve the Light Load
Efficiency
⢠Adjustable Over Power Protection
⢠AutoâRecovery or Latched Internal Output ShortâCircuit Protection
⢠Fixed Internal 80 ms Timer for ShortâCircuit Protection
⢠Combined Overvoltage and Overtemperature Protection (A and B
Versions)
⢠Combined Overvoltage Protection and BrownâOut (C and D
Versions)
⢠+500 mA/â800 mA Peak Current Source/Sink Capability
⢠Internal Temperature Shutdown
⢠Direct Optocoupler Connection
⢠Extended VCC Range Operation Up to 28 V
⢠Extremely Low NoâLoad Standby Power
⢠SOâ8 Package
⢠These Devices are PbâFree and are RoHS Compliant
Typical Applications
⢠High Power acâdc Converters for TVs, SetâTop Boxes etc.
⢠Offline Adapters for Notebooks
http://onsemi.com
QUASIâRESONANT PWM
CONTROLLER FOR HIGH
POWER ACâDC WALL
ADAPTERS
8
1
SOICâ8
D SUFFIX
CASE 751
MARKING DIAGRAMS
8
1380x
ALYW
G
1
1380x
x
A
L
Y
W
G
= Specific Device Code
= Device Option (A, B, C, or D)
= Assembly Location
= Wafer Lot
= Year
= Work Week
= PbâFree Package
PIN CONNECTIONS
ZCD 1
FB 2
CS 3
GND 4
8 CT
7 FAULT
6 VCC
5 DRV
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 25 of this data sheet.
© Semiconductor Components Industries, LLC, 2012
1
June, 2012 â Rev. 4
Publication Order Number:
NCP1380/D
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