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NCP1381 Datasheet(PDF) 1 Page - ON Semiconductor

Part No. NCP1381
Description  Low−Standby High Performance PWM Controller
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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NCP1381 Datasheet(HTML) 1 Page - ON Semiconductor

 
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© Semiconductor Components Industries, LLC, 2006
July, 2006 − Rev. 3
1
Publication Order Number:
NCP1381/D
NCP1381
Low−Standby High
Performance PWM
Controller
Housed in a SO−14 package, the NCP1381 includes everything
needed to build rugged and efficient Quasi−Resonant (QR) Switching
Power Supplies. When powered by a front−end Power Factor
Correction circuitry, the NCP1381 automatically disconnects the PFC
controller in low output loading conditions (with an adjustable level),
thus improving the standby power. This is particularly well suited for
medium to high power offline applications, e.g. notebook adapters.
When the current setpoint falls below a given value, e.g. the output
power demand diminishes, the IC automatically enters the so−called
skip cycle mode and provides excellent efficiency at light loads.
Because this occurs at an adjustable low peak current together with a
proprietary Soft−Skip
t technique, no acoustic noise takes place. Skip
cycle also offers the ability to easily select the maximum switching
frequency at which foldback and standby take place.
The NCP1381 also features several efficient protection options like
a) a short−circuit / overload detection independent of the auxiliary
voltage b) an auto−recovery brown−out detection and c) an input to
externally latch the circuit in case of Overvoltage Protection or Over
Temperature Protection.
Features
Current−Mode Quasi−Resonant Operation
Adjustable Line Over Power Protection
Extremely Low Startup Current of 15 mA Maximum
Soft−Skip Cycle Capability at Adjustable Peak Currents
Plateau Sensing Overvoltage
Brown−Out Protection
Maximum tON Limitation
Overpower Protection by current Sense Offset
Internal 5 ms Soft−Start Management
Short−Circuit Protection Independent from Auxiliary Level
External Latch Input Pin for an OTP Signal
Go−To−Standby Signal for the PFC Front Stage
True Frequency (tON + tOFF) Clamp Circuit
Low and Noiseless, No−Load Standby Power
Internal Leading Edge Blanking
+500 mA / −800 mA Peak Current Drive Capability
5 V / 10 mA Reference Voltage
This is a Pb−Free Device
Typical Applications
High Power AC/DC Adapters for Notebooks, etc
Offline Battery Chargers
Set−Top Boxes Power Supplies, TV, Monitors, etc
1
14
NCP1381G
AWLYWW
1
14
NCP1381G = Specific Device Code
A
= Assembly Location
WL
= Wafer Lot
Y
= Year
WW
= Work Week
G = Pb−Free Package
MARKING
DIAGRAM
See detailed ordering and shipping information in the package
dimensions section on page 25 of this data sheet.
ORDERING INFORMATION
1
2
3
4
5
6
7
14
13
12
11
10
9
8
nc
nc
Ref
GND
VCC
GTS
DRV
Skip/OVP
Timer
ADJ_GTS
BO
DMG
FB
CS
HIGH PERFORMANCE QR
CONTROLLER FEATURING PFC
SHUTDOWN
http://onsemi.com
SOIC−14
D SUFFIX
CASE 751A


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