ACT512US-T datasheet(1/4 Pages) ACTIVE-SEMI

No de pièce	ACT512US-T

Description	ActiveQRTM Quasi-Resonant PWM Controller

PDF	4 Pages

Scroll/Zoom	100%

Fabricant	ACTIVE-SEMI [Active-Semi, Inc]

Site Internet	http://www.active-semi.com

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Innovative Power

TM

- 1 -

www.active-semi.com

ActiveQR

TM is a trademark of Active-Semi.

Product Brief, 18-Feb-14

ActiveQR

TM Quasi-Resonant PWM Controller

FEATURES

• CCM and Quasi-Resonant Operation

• Adjustable up to 75kHz 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 Winding Short Protection

• 100mW Standby Power

• Complies with Global Energy Efficiency and

CEC Average Efficiency Standards

• Tiny SOT23-6 Packages

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 ACT512 is a high performance peak current

mode PWM controller. ACT512 applies ActiveQRTM

and frequency foldback technique to reduce EMI

and improve efficiency. ACT512’s maximum design

switching frequency is set at 75kHz. Very low

standby power, good dynamic response and

accurate voltage regulation is achieved with an

opto-coupler and the secondary side control circuit.

The idle mode operation enables low standby

power of 100mW with small output voltage ripple.

By applying frequency foldback and ActiveQRTM

technology, ACT512 increases the average system

efficiency compared to conventional solutions and

exceeds the latest ES2.0 efficiency standard with

good margin.

ACT512 integrates comprehensive protection. In

case of over temperature, over voltage, winding

short, current sense resistor short, open loop and

overload conditions, it would enter into auto restart

mode including Cycle-by-Cycle current limiting.

ACT512 is to achieve no overshoot and very short

rise time even with a big capacitive load with the

built-in fast and soft start process.

In full load condition, ACT512 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 improve

efficiency during DCM operation, and reduce EMI

and further reduce the components in input filter.

ACT512 is ideal for applications up to 60 Watts.

Figure 1:

Simplified Application Circuit

ACT512

Numéro de pièce similaire - ACT512US-T

Fabricant	No de pièce	Fiches technique	Description
Active-Semi, Inc	ACT512US-T	178Kb / 4P	ActiveQR Quasi-Resonant PWM Controller 05-Dec-12

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