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NCP1200A

PWM Current-Mode Controller for Universal Off-Line Supplies Featuring Low Standby Power

ON Semiconductor 

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

• No Auxiliary Winding Operation

• Auto−Recovery Internal Output Short−Circuit Protection

• Extremely Low No−Load Standby Power

• Current−Mode Control with Skip−Cycle Capability

• Internal Temperature Shutdown

• Internal Leading Edge Blanking

• 250 mA Peak Current Capability

• Internally Fixed Frequency at 40 kHz, 60 kHz and 100 kHz

• Direct Optocoupler Connection

• SPICE Models Available for TRANsient and AC Analysis

• Pin to Pin Compatible with NCP1200

• Pb−Free Packages are Available

Typical Applications

• AC−DC Adapters for Portable Devices

• Offline Battery Chargers

• Auxiliary Power Supplies (USB, Appliances, TVs, etc.)

http://onsemi.com

MINIATURE PWM

CONTROLLER FOR HIGH

POWER AC−DC WALL

ADAPTERS AND OFFLINE

BATTERY CHARGERS

8

1

8

1

SOIC−8

D SUFFIX

CASE 751

MARKING

DIAGRAMS

8

200Ax

ALYW

G

1

PDIP−8

P SUFFIX

CASE 626

8

1200APyy

AWL

YYWWG

1

x

= 1, 4, or 6

yy

= 40, 60, or 100

A

= Assembly Location

L, WL = Wafer Lot

Y, YY = Year

W, WW = Work Week

G or G = Pb−Free Package

PIN CONNECTIONS

Adj 1

FB 2

CS 3

GND 4

8 HV

7 NC

6 VCC

5 Drv

(Top View)

ORDERING INFORMATION

See detailed ordering and shipping information in the

package dimensions section on page 14 of this data sheet.

© Semiconductor Components Industries, LLC, 2011

1

January, 2011 − Rev. 9

Publication Order Number:

NCP1200A/D

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