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ACT513

ActiveQR™ Quasi-Resonant PWM Controller

Active-Semi, Inc 

ACT513

Product Brief, 05-Dec-12

ActiveQRTM Quasi-Resonant PWM Controller

FEATURES

• CCM and Quasi-Resonant Operation

• Adjustable up to 45kHz Switching Frequency

• OCP/OLP Protection

• Integrated Patented Frequency Foldback

Technique

• Integrated Patented Line 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

ACT513 integrates comprehensive protection. In

case of over temperature, over voltage, short

winding, short current sense resistor, open loop an

d overload conditions, it would enter into auto

restart mode including Cycle-by-Cycle current

limiting.

ACT513 is to achieve no overshoot and very short

rise time even with big capacitive load with the built-

in fast and soft start process.

In full load condition, ACT513 is able to be

designed to work in both CCM mode and DCM

mode to meet different types of applications. Quasi-

Resonant (QR) operation mode can effectively

improve efficiency during DCM operation, and

reduce the EMI noise and further reduce the

components in input filter.

ACT513 is for application up to 60 Watt.

Figure 1:

Simplified Application Circuit

APPLICATIONS

• AC/DC Adaptors/Chargers for Cell Phones,

Cordless Phone, PDAs, E-books

• Adaptors for Portable Media Player, DSCs,

Set-top boxes, DVD players, records

• Linear Adapter Replacements

GENERAL DESCRIPTION

The ACT513 is a high performance peak current

mode PWM controller. ACT513 applies ActiveQRTM

and frequency foldback technique to reduce EMI

and improve efficiency. ACT513’s maximum design

switching frequency is set at 45kHz. Very low

standby power, good dynamic response and

accurate voltage regulation is achieved with an

opto-coupler and the secondary side control circuit.

The burst mode operation enables low standby

power of 100mW with small output voltage ripple.

By applying frequency foldback and ActiveQRTM

technology, ACT513 increases the average system

efficiency compared to conventional solutions and

exceeds the latest ES2.0 efficiency standard with

good margin.

Innovative PowerTM

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ActiveQRTM is a trademark of Active-Semi.

www.active-semi.com

Copyright © 2012 Active-Semi, Inc.

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