Innovative Power

TM

- 1 -

www.active-semi.com

Copyright © 2011 Active-Semi, Inc.

ActivePSR

High Performance ActivePSR

FEATURES

Technology

Compensation

Resistance Compensation

Output Short-Circuit and Over-Temperature

Protection

and CEC Average Efficiency Standards

APPLICATIONS

Portable Media Players, DSCs, and Other

Portable Devices and Appliances

GENERAL DESCRIPTION

The ACT334 belongs to the high performance

patented ActivePSR

TM

Family of Universal-input

AC/DC off-line controllers for battery charger and

adapter applications. It is designed for flyback

topology working in discontinuous conduction mode

(DCM). The ACT334 meets all of the global energy

efficiency regulations (CEC, European Blue Angel,

and US Energy Star standards) while using very

few external components.

The ACT334 ensures safe operation with complete

protection

against

all

fault

conditions.

Built-in

protection circuitry is provided for output short-

circuit, output over-voltage, line under-voltage, and

over temperature conditions.

The ACT334 ActivePSR

TM

is optimized for high

performance,

cost-sensitive

applications,

and

utilizes

Active-Semi’s

proprietary

primary-side

feedback architecture to provide accurate constant

voltage,

constant

current

(CV/CC)

regulation

without the need of an opto-coupler or reference

device. Integrated line and primary inductance

compensation circuitry provides accurate constant

current operation despite wide variations in line

voltage and primary inductance. Integrated output

cord resistance compensation further enhances

output accuracy. The ACT334 achieves excellent

regulation and transient response, yet requires less

than 30mW of standby power.

The ACT334 is optimized for compact size 2W to

6W charger applications. It is available in space-

saving 6 pin SOT23-6 package.

Figure 1:

Simplified Application Circuit

ACT334

Product Brief, 15-Apr-11

®