®
ACT337
Product Brief, 15-Apr-11
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 ACT337 achieves excellent
regulation and transient response, yet requires less
than 30mW of standby power.
The ACT337 is optimized for compact size 7W to
12W charger applications. It is available in space-
saving 8 pin SOP-8 package.
Figure 1:
Simplified Application Circuit
High Performance
ActivePSR
TM
Primary Switching Regulator
FEATURES
•
Ultra Low Standby Power < 30mW
•
Patented Primary Side Regulation
Technology
•
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 7W to 12W
•
Minimum External Components
•
SOP-8 Package
APPLICATIONS
•
RCC Adapter Replacements
•
Linear Adapter Replacements
•
Standby and Auxiliary Supplies
GENERAL DESCRIPTION
The ACT337 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 ACT337 meets all of the global energy
efficiency regulations (CEC, European Blue Angel,
and US Energy Star standards) while using very
few external components.
The ACT337 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 ACT337
ActivePSR
TM
is optimized for high
performance, cost-sensitive applications, and
Innovative Power
TM
ActivePSR
TM
-1-
www.active-semi.com
Copyright © 2011 Active-Semi, Inc.
is a trademark of Active-Semi.
ACTIVE-SEMI [ ACTIVE-SEMI, INC ]
