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NCP1271 Datasheet, PDF (1/21 Pages) ON Semiconductor – Soft−Skip Mode Standby PWM Controller with Adjustable Skip Level and External Latch | |||
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NCP1271
Soft-Skipt Mode Standby
PWM Controller with
Adjustable Skip Level and
External Latch
The NCP1271 represents a new, pin to pin compatible, generation
of the successful 7âpin current mode NCP12XX product series. The
controller allows for excellent stand by power consumption by use of
its adjustable SoftâSkip mode and integrated high voltage startup
FET. This proprietary SoftâSkip also dramatically reduces the risk of
acoustic noise. This allows the use of inexpensive transformers and
capacitors in the clamping network. Internal frequency jittering,
ramp compensation, timerâbased fault detection and a latch input
make this controller an excellent candidate for converters where
ruggedness and component cost are the key constraints.
Features
⢠FixedâFrequency CurrentâMode Operation with Ramp
Compensation and Skip Cycle in Standby Condition
⢠TimerâBased Fault Protection for Improved Overload Detection
⢠âSoftâSkip Modeâ Technique for Optimal Noise Control in Standby
⢠Internal HighâVoltage Startup Current Source for Lossless Startup
⢠"5% Current Limit Accuracy over the Full Temperature Range
⢠Adjustable Skip Level
⢠Internal Latch for Easy Implementation of Overvoltage and
Overtemperature Protection
⢠Frequency Jittering for Softened EMI Signature
⢠+500 mA/â800 mA Peak Current Drive Capability
⢠Subâ100 mW Standby Power can be Achieved
⢠PinâtoâPin Compatible with the Existing NCP120X Series
⢠This is a PbâFree Device
Typical Applications
⢠ACâDC Adapters for Notebooks, LCD Monitors
⢠Offline Battery Chargers
⢠Consumer Electronic Appliances STB, DVD, DVDR
http://onsemi.com
SOICâ7
D SUFFIX
CASE 751U
MARKING
DIAGRAMS
8
1271x
ALYWG
G
1
8
1
PDIPâ7 VHVIC
P SUFFIX
CASE 626B
1
1271Pxxx
AWL
YYWWG
x
= A or B
A= 65 kHz
B= 100 kHz
xxx = Device Code: 65, 100
A
= Assembly Location
L, WL = Wafer Lot
Y, YY = Year
W, WW = Work Week
G or G = PbâFree Package
(Note: Microdot may be in either location)
PIN CONNECTIONS
Skip/latch 1
FB 2
CS 3
4
GND
8 HV
6 VCC
5 Drv
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 19 of this data sheet.
*For additional information on our PbâFree strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques Reference
Manual, SOLDERRM/D.
© Semiconductor Components Industries, LLC, 2009
1
September, 2009 â Rev. 6
Publication Order Number:
NCP1271/D
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