ncp1231d65r2g ON Semiconductor, ncp1231d65r2g Datasheet

ncp1231d65r2g

Manufacturer Part Number

ncp1231d65r2g

Description

Lowstandby Power High Performance Pwm Controller

Manufacturer

ON Semiconductor

Datasheet

1.NCP1231D65R2G.pdf (21 pages)

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NCP1231

Low−Standby Power High

Performance PWM

Controller

standby power in mediumïtoïhigh power SwitchedïMode Power

Supplies such as notebook adapters, offïline battery chargers and

consumer electronics equipment. Housed in SOICï8 or PDIPï8, 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

frontïend 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.

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 V

addition, Pin 8 also serves as a BrownïOut input which provides the

necessary safety feature when the SMPS faces low mains situations.

Features

Typical Applications

¤ Semiconductor Components Industries, LLC, 2006

July, 2006 ï Rev. 4

The NCP1231 represents a major leap towards achieving low

The NCP1231 also features an internal latching function that can be

CurrentïMode Operation with Internal Ramp Compensation

Extremely Low Startup Current of 30 mA Typical

SkipïCycle Capability at Low Peak Currents

Adjustable SoftïStart

Overvoltage and BrownïOut Protection

ShortïCircuit Protection Independent of Auxiliary Level

Internal Frequency Dithering for Improved EMI Signature

GoïToïStandby Signal for PFC Front Stage

Extremely Low NoïLoad, Noiseless, Standby Power

Internal Leading Edge Blanking

+500 mA/ï800 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

PbïFree Packages are Available

High Power ACïDC Adapters for Notebooks, etc.

Offline Battery Chargers

SetïTop Boxes Power Supplies, TV, Monitors, etc.

drops below 4.0 V (V

CCreset

). In

See detailed ordering and shipping information in the package

dimensions section on page 19 of this data sheet.

PFC_V

231Dxy

1231Pzz = Device Code

L, WL

Y, YY

W, WW

G or G

ORDERING INFORMATION

GND

PIN CONNECTIONS

http://onsemi.com

CASE 751

CASE 626

D SUFFIX

P SUFFIX

SOICï8

= Device Code

= Assembly Location

= Wafer Lot

= Year

= Work Week

= PbïFree Package

PDIPï8

x = 1 or 6

y = 0 or 3

zz = 65, 100 or 133

Publication Order Number:

BO/OVP

DRV

DIAGRAMS

MARKING

YYWWG

1231Pzz

NCP1231/D

231Dx

ALYW

AWL

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