ACT511 データシートの表示（PDF） - Active-Semi, Inc

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ACT511

ActiveQR™ Quasi-Resonant PWM Controller

Active-Semi, Inc 

ACT511

Product Brief, 05-Dec-12

ActiveQRTM Quasi-Resonant PWM Controller

FEATURES

• Quasi-Resonant Operation

• Adjustable up to 75kHz Switching Frequency

• Accurate OCP/OLP Protection

• Integrated Patented Frequency Foldback

Technique

• Integrated Patented 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

good margin.

ACT511 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.

ACT511 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.

ACT511 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 ACT511 is a high performance peak current

mode PWM controller. ACT511 applies ActiveQRTM

and frequency foldback technique to reduce EMI

and improve efficiency. ACT511’s maximum

switching frequency is set at 90kHz. 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, ACT511 increases the average system

efficiency compared to conventional solutions and

exceeds the latest ES2.0 efficiency standard with

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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