© Semiconductor Components Industries, LLC, 2015

April, 2015 − Rev. 12

1

Publication Order Number:

NCP1203/D

NCP1203

PWM Current-Mode

Controller for Universal

Off-Line Supplies Featuring

Standby and Short Circuit

Protection

Housed in SOIC−8 or PDIP−8 package, the NCP1203 represents a

major leap toward ultra−compact Switchmode Power Supplies and

represents an excellent candidate to replace the UC384X devices. Due

to its proprietary SMARTMOS

™ Very High Voltage Technology, the

circuit allows the implementation of complete off−line AC−DC

adapters, battery charger and a high−power SMPS with few external

components.

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

100 kHz switching frequency, the controller features a high−voltage

startup FET which ensures a clean and loss−less startup sequence. Its

current−mode control naturally provides good 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 improved efficiency at light loads

while offering excellent performance in standby conditions. Because

this occurs at a user adjustable low peak current, no acoustic noise

takes place.

The NCP1203 also includes an efficient protective circuitry which,

in presence of an output over load 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. Finally, a

temperature shutdown with hysteresis helps building safe and robust

power supplies.

Features

Compliant

Applications

MARKING

DIAGRAM

x

= 4, 6, or 1

A

= Assembly Location

L

= Wafer Lot

Y

= Year

W

= Work Week

G

= Pb−Free Package

www.onsemi.com

SOIC−8

D1, D2 SUFFIX

CASE 751

1

8

1

8

1203Pxx

AWL

YYWWG

1

8

See detailed ordering and shipping information on page 13 of

this data sheet.

ORDERING INFORMATION

PIN CONNECTIONS

1

Adj

8 HV

2

FB

3

CS

4

GND

7 NC

5 Drv

(Top View)

203Dx

ALYW

G

1

8

xx

= 40, 60, or 100

A

= Assembly Location

WL

= Wafer Lot

YY

= Year

WW

= Work Week

G

= Pb−Free Package

PDIP−8

N SUFFIX

CASE 626