© Semiconductor Components Industries, LLC, 2004

October, 2004− Rev. 5

1

Publication Order Number:

NCP1200A/D

NCP1200A

PWM Current−Mode

Controller for Universal

Off−Line Supplies Featuring

Low Standby Power

Housed in SOIC−8 or PDIP−8 package, the NCP1200A enhances

the previous NCP1200 series by offering a reduced optocoupler

current together with an increased drive capability. Due to its novel

concept, the circuit allows the implementation of complete off−line

AC−DC adapters, battery charger or a SMPS where standby power is a

key parameter.

With an internal structure operating at a fixed 40 kHz, 60 kHz or

100 kHz, the controller supplies itself from the high−voltage rail,

avoiding the need of an auxiliary winding. This feature naturally eases

the designer task in battery charger applications. Finally,

current−mode control provides an excellent audio−susceptibility and

inherent pulse−by−pulse control.

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 a user adjustable low peak current, no acoustic

noise takes place.

The NCP1200A features an efficient protective circuitry which, in

presence of an overcurrent condition, disables the output pulses while

the device enters a safe burst mode, trying to restart. Once the default

has gone, the device auto−recovers.

Features

Typical Applications

SOIC−8

D SUFFIX

CASE 751

1

8

MARKING

DIAGRAMS

PIN CONNECTIONS

PDIP−8

P SUFFIX

CASE 626

1

8

1

8

1200APxxx

AWL

YYWW

200Ay

ALYW

xxx

= Specific Device Code

(40, 60 or 100)

y

= Specific Device Code

(4 for 40, 6 for 60, 1 for 100)

A

= Assembly Location

WL, L

= Wafer Lot

Y, YY

= Year

W, WW = Work Week

1

Adj

8 HV

2

FB

3

CS

4

GND

7 NC

5 Drv

(Top View)

MINIATURE PWM

CONTROLLER FOR HIGH

POWER AC−DC WALL

ADAPTERS AND OFFLINE

BATTERY CHARGERS

See detailed ordering and shipping information in the package

dimensions section on page 13 of this data sheet.

ORDERING INFORMATION

http://onsemi.com

1

8