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NCP1271 Datasheet(PDF) 1 Page - ON Semiconductor

Part No. NCP1271
Description  Soft−Skip Mode Standby PWM Controller with Adjustable Skip Level and External Latch
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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NCP1271 Datasheet(HTML) 1 Page - ON Semiconductor

 
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© Semiconductor Components Industries, LLC, 2009
September, 2009 − Rev. 6
1
Publication Order Number:
NCP1271/D
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 7−pin current mode NCP12XX product series. The
controller allows for excellent stand by power consumption by use of
its adjustable Soft−Skip mode and integrated high voltage startup
FET. This proprietary Soft−Skip 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, timer−based fault detection and a latch input
make this controller an excellent candidate for converters where
ruggedness and component cost are the key constraints.
Features
Fixed−Frequency Current−Mode Operation with Ramp
Compensation and Skip Cycle in Standby Condition
Timer−Based Fault Protection for Improved Overload Detection
“Soft−Skip Mode” Technique for Optimal Noise Control in Standby
Internal High−Voltage 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/−800 mA Peak Current Drive Capability
Sub−100 mW Standby Power can be Achieved
Pin−to−Pin Compatible with the Existing NCP120X Series
This is a Pb−Free Device
Typical Applications
AC−DC Adapters for Notebooks, LCD Monitors
Offline Battery Chargers
Consumer Electronic Appliances STB, DVD, DVDR
*For additional information on our Pb−Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques Reference
Manual, SOLDERRM/D.
PIN CONNECTIONS
http://onsemi.com
MARKING
DIAGRAMS
(Top View)
1271x
ALYWG
G
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 = Pb−Free Package
1
8
(Note: Microdot may be in either location)
Skip/latch
FB
CS
GND
1
2
3
4
HV
VCC
Drv
8
6
5
SOIC−7
D SUFFIX
CASE 751U
See detailed ordering and shipping information in the package
dimensions section on page 19 of this data sheet.
ORDERING INFORMATION
PDIP−7 VHVIC
P SUFFIX
CASE 626B
1
8
1271Pxxx
AWL
YYWWG
1


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