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NCP1231 Datasheet(PDF) 1 Page - ON Semiconductor

Part No. NCP1231
Description  Low−Standby Power High Performance PWM Controller
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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NCP1231 Datasheet(HTML) 1 Page - ON Semiconductor

 
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© Semiconductor Components Industries, LLC, 2006
July, 2006 − Rev. 4
1
Publication Order Number:
NCP1231/D
NCP1231
Low−Standby Power High
Performance PWM
Controller
The NCP1231 represents a major leap towards achieving low
standby power in medium−to−high power Switched−Mode Power
Supplies such as notebook adapters, off−line battery chargers and
consumer electronics equipment. Housed in SOIC−8 or PDIP−8, the
NCP1231 contains all needed control functionality to build a rugged
and efficient power supply. Among the unique features offered by the
NCP1231 is an event management scheme that can disable the
front−end PFC circuit during standby, thus reducing the no load power
consumption. The NCP1231 itself goes into cycle skipping at light
loads while limiting peak current (to 25% of nominal peak) so that no
acoustic noise is generated and while in the skip cycle mode.
The NCP1231 also features an internal latching function that can be
used for Overvoltage Protection (OVP). The latch is triggered when
the voltage on Pin 8 rises above 4.0 V. During an OVP condition, the
output drive pulses are immediately stopped and the NCP1231 stays in
the latched off condition until VCC drops below 4.0 V (VCCreset). In
addition, Pin 8 also serves as a Brown−Out input which provides the
necessary safety feature when the SMPS faces low mains situations.
Features
Current−Mode Operation with Internal Ramp Compensation
Extremely Low Startup Current of 30 mA Typical
Skip−Cycle Capability at Low Peak Currents
Adjustable Soft−Start
Overvoltage and Brown−Out Protection
Short−Circuit Protection Independent of Auxiliary Level
Internal Frequency Dithering for Improved EMI Signature
Go−To−Standby Signal for PFC Front Stage
Extremely Low No−Load, Noiseless, Standby Power
Internal Leading Edge Blanking
+500 mA/−800 mA Peak Current Drive Capability
Available in Three Frequency Options: 65 kHz, 100 kHz, and 133 kHz
Direct Optocoupler Connection
SPICE Models Available for TRANsient and AC Analysis
Pb−Free Packages are Available
Typical Applications
High Power AC−DC Adapters for Notebooks, etc.
Offline Battery Chargers
Set−Top Boxes Power Supplies, TV, Monitors, etc.
http://onsemi.com
SOIC−8
D SUFFIX
CASE 751
PDIP−8
P SUFFIX
CASE 626
PIN CONNECTIONS
DRV
GND
18
VCC
CS
FB
BO/OVP
PFC_VCC
MARKING
DIAGRAMS
231Dxy
= Device Code
x = 1 or 6
y = 0 or 3
1231Pzz = Device Code
zz = 65, 100 or 133
A
= Assembly Location
L, WL
= Wafer Lot
Y, YY
= Year
W, WW
= Work Week
G or G
= Pb−Free Package
1
1
1231Pzz
AWL
YYWWG
1
SS
231Dx
y
1
8
See detailed ordering and shipping information in the package
dimensions section on page 19 of this data sheet.
ORDERING INFORMATION
ALYW
G
8


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