ACT334
Rev 2, 14-Nov-12
High Performance
ActivePSR
TM
Primary Switching Regulator
FEATURES
•
Ultra Low Standby Power < 30mW
•
Patented Primary Side Regulation
Technology
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
•
Suitable Operation Frequency up to 85kHZ
•
Proprietary Fast Startup Circuit
•
Integrated Line and Primary Inductance
Compensation
•
Integrated Programmable Output Cord
Resistance Compensation
•
Line Under-Voltage, Output Over-Voltage,
Output Short-Circuit and Over-Temperature
Protection
•
Complies with all Global Energy Efficiency
and CEC Average Efficiency Standards
•
Adjustable Power from 2W to 6W
•
Minimum External Components
•
Tiny SOT23-6 Package
APPLICATIONS
•
Chargers for Cell Phones, PDAs, MP3,
Portable Media Players, DSCs, and Other
Portable Devices and Appliances
•
RCC Adapter Replacements
•
Linear Adapter Replacements
•
Standby and Auxiliary Supplies
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
Innovative Power
TM
-1-
www.active-semi.com
Copyright © 2012 Active-Semi, Inc.
ACTIVE-SEMI [ ACTIVE-SEMI, INC ]
