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NCP1379

QUASI−RESONANT PWM CONTROLLER FOR HIGH POWER AC−DC WALL ADAPTERS

ON Semiconductor 

NCP1379

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Quasi-Resonant

Current-Mode Controller for

High-Power Universal

Off-line Supplies

The NCP1379 hosts a high−performance circuitry aimed to

powering quasi−resonant converters. Capitalizing on a proprietary

valley−lockout system, the controller shifts gears and reduces the

switching frequency as the power loading becomes lighter. This

results in a stable operation despite switching events always occurring

in the drain−source valley. This system works down to the 4th valley

and toggles to a variable frequency mode beyond, ensuring an

excellent standby power performance.

The controller includes an Over Power Protection circuit which

clamps the delivered power at high−line. Safety−wise, a fixed internal

timer relies on the feedback voltage to detect a fault. Once the timer

elapses, the controller stops and enters auto−recovery mode, ensuring

a low duty−cycle burst operation. To further improve the safety of the

power supply, the NCP1379 features a pin to implement a combined

brown−out/overvoltage protection.

Particularly well suited for TVs power supply applications, the

controller features a low startup voltage allowing the use of an

auxiliary power supply to power the device.

Features

• Quasi−Resonant Peak Current−Mode Control Operation

• Valley Switching Operation with Valley−Lockout for Noise−Immune

Operation

• Frequency Foldback at Light Load to Improve the Light Load

Efficiency

• Adjustable Over Power Protection

• Auto−Recovery Output Short−Circuit Protection

• Fixed Internal 80 ms Timer for Short−Circuit Protection

• Combined Overvoltage Protection and Brown−out

• +500 mA / −800 mA Peak Current Source/Sink Capability

• Internal Temperature Shutdown

• Direct Optocoupler Connection

• Low VCC(on) Allowing to Use a Standby Power Supply to Power the

Device

• Extremely Low No−Load Standby Power

• SO8 Package

• These Devices are Pb−Free and are RoHS Compliant

Typical Applications

• High Power ac−dc Converters for TVs, Set−Top Boxes etc.

• Offline Adapters for Notebooks

This document contains information on a product under development. ON Semiconductor

reserves the right to change or discontinue this product without notice.

http://onsemi.com

QUASI−RESONANT PWM

CONTROLLER FOR HIGH

POWER AC−DC WALL

ADAPTERS

8

1

SOIC−8

D SUFFIX

CASE 751

MARKING

DIAGRAMS

8

1379

ALYW

G

1

1379

A

L

Y

W

G

= Specific Device Code

= Assembly Location

= Wafer Lot

= Year

= Work Week

= Pb−Free Package

PIN CONNECTIONS

ZCD 1

FB 2

CS 3

GND 4

8 CT

7 FAULT

6 VCC

5 DRV

ORDERING INFORMATION

See detailed ordering and shipping information in the package

dimensions section on page 21 of this data sheet.

© Semiconductor Components Industries, LLC, 2009

1

December, 2009 − Rev. P0

Publication Order Number:

NCP1379/D

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