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ACT411

ActivePSR™ Quasi-Resonant PWM Controller

Active-Semi, Inc 

ACT41X

Product Brief, 06-Dec-12

ActivePSRTM Quasi-Resonant PWM Controller

FEATURES

• Patented Primary Side Regulation

Technology

• Quasi-Resonant Operation

• Adjustable up to 120kHz Switching

Frequency

• +/-5% Output Voltage Regulation

• Accurate OCP/OLP Protection

• Integrated Output Cord Compensation

• Integrated Line and Primary Inductance

Compensation

• Built-in Soft-Start Circuit

• Line Under-Voltage, Thermal, Output Over-

voltage, Output Short Protections

• Current Sense Resistor Short Protection

• Transformer Short Winding Protection

• 100mW Standby Power

• Complies with Global Energy Efficiency and

CEC Average Efficiency Standards

• Tiny SOT23-6 Packages

and overload conditions, it would enter auto restart

mode including cycle-by-cycle current limiting.

ACT41X is to achieve no overshoot and very short

rise time even with big capacitive load (4000µF)

with the built-in fast and soft start process, .

The Quasi-Resonant (QR) operation mode can

effectively improve efficiency, reduce the EMI noise

and further reduce the components in input filter.

ACT41X is idea for application up to 36 Watt.

Figure 1:

Simplified Application Circuit

APPLICATIONS

• AC/DC Adaptors/Chargers for Cell Phones,

ADSL, PDAs, E-books

• Adaptors for Portable Media Player, DSCs,

and Other

GENERAL DESCRIPTION

The ACT41X is a high performance peak current

mode PWM controller which applies ActivePSRTM

and ActiveQRTM technology. ACT41X achieves

accurate voltage regulation without the need of an

opto-coupler or reference device.

The ACT41X is designed to achieve less than

100mW Standby Power. By applying frequency fold

back and ActiveQRTM technology, ACT41X

exceeds the latest ES2.0 efficiency standard.

ACT41X integrates comprehensive protection. In

case of over temperature, over voltage, short

winding, short current sense resistor, open loop

Innovative PowerTM

-1-

ActivePSRTM is a trademark of Active-Semi.

www.active-semi.com

Copyright © 2012 Active-Semi, Inc.

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