NCP1380 Datasheet, PDF (1/26 Pages) ON Semiconductor – Quasi-Resonant Current-Mode Controller for High-Power Universal Off-Line Supplies

NCP1380
Quasi-Resonant
Current-Mode Controller for
High-Power Universal
Off-Line Supplies
The NCP1380 hosts a high−performance circuitry aimed to
powering quasi−resonant converters. Capitalizing on a proprietary
valley−lockout 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 drain−source valley. This system works down to the 4^th 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 high−line. Safety−wise, 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
auto−recovery 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
brown−out/overvoltage protection (Version C and D).
Features
• Quasi−Resonant Peak Current−Mode Control Operation
• Valley Switching Operation with Valley−Lockout for Noise−Immune
Operation
• Frequency Foldback at Light Load to Improve the Light Load
Efficiency
• Adjustable Over Power Protection
• Auto−Recovery or Latched Internal Output Short−Circuit Protection
• Fixed Internal 80 ms Timer for Short−Circuit Protection
• Combined Overvoltage and Overtemperature Protection (A and B
Versions)
• Combined Overvoltage Protection and Brown−Out (C and D
Versions)
• +500 mA / −800 mA Peak Current Source/Sink Capability
• Internal Temperature Shutdown
• Direct Optocoupler Connection
• Extended V_CC Range Operation Up to 28 V
• Extremely Low No−Load Standby Power
• SO−8 Package
• These Devices are Pb−Free and are RoHS Compliant
Typical Applications
• High Power ac−dc Converters for TVs, Set−Top Boxes etc.
• Offline Adapters for Notebooks
http://onsemi.com
QUASI−RESONANT PWM
CONTROLLER FOR HIGH
POWER AC−DC WALL
ADAPTERS
8
1
SOIC−8
D SUFFIX
CASE 751
MARKING
DIAGRAMS
8
1380X
ALYWX
G
1
1380X = Specific Device Code
X
= Device Option (A, B, C, or D)
A
= Assembly Location
L
= Wafer Lot
Y
= Year
W
= Work Week
G
= Pb−Free 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, 2009
1
December, 2009 − Rev. 1
Publication Order Number:
NCP1380/D