© Semiconductor Components Industries, LLC, 2004

December, 2004 − Rev. 13

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Publication Order Number:

NCP1200/D

NCP1200

PWM Current−Mode

Controller for Low−Power

Universal Off−Line Supplies

Housed in SOIC−8 or PDIP−8 package, the NCP1200 represents a

major leap toward ultra−compact Switchmode Power Supplies. Due to

a novel concept, the circuit allows the implementation of a complete

offline battery charger or a standby SMPS with few external

components. Furthermore, an integrated output short−circuit

protection lets the designer build an extremely low−cost AC−DC wall

adapter associated with a simplified feedback scheme.

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

100 kHz, the controller drives low gate−charge switching devices like

an IGBT or a MOSFET thus requiring a very small operating power.

Due to current−mode control, the NCP1200 drastically simplifies the

design of reliable and cheap offline converters with extremely low

acoustic generation 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 skip cycle

mode and provides excellent efficiency at light loads. Because this

occurs at low peak current, no acoustic noise takes place.

Finally, the IC is self−supplied from the DC rail, eliminating the

need of an auxiliary winding. This feature ensures operation in

presence of low output voltage or shorts.

Features

Typical Applications

PDIP−8

P SUFFIX

CASE 626

1

8

1

8

SOIC−8

D SUFFIX

CASE 751

18

5

3

4

(Top View)

Adj

CS

HV

PIN CONNECTIONS

7

6

2

NC

FB

GND

Drv

MARKING

DIAGRAMS

See detailed ordering and shipping information in the package

dimensions section on page 14 of this data sheet.

ORDERING INFORMATION

xxx

= Device Code: 40, 60 or 100

y

= Device Code:

4 for 40

6 for 60

1 for 100

A

= Assembly Location

L

= Wafer Lot

Y, YY

= Year

W, WW = Work Week

200Dy

ALYW

1200Pxxx

AWL

YYWW

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