Innovative Power

TM

- 1 -

www.active-semi.com

Copyright © 2014 Active-Semi, Inc.

FEATURES

Allow Low-Profile Designs

Control Improves Efficiency and Lowers Cost.

0.25Ω

APPLICATIONS

GENERAL DESCRIPTION

ACT4533C is a wide input voltage, high efficiency

ActiveCC step-down DC/DC converter that operates

in either CV (Constant Output Voltage) mode or CC

(Constant Output Current) mode. ACT4533C

provides up to 3.5A output current at 125kHz

switching frequency.

ActiveCC is a patented control scheme to achieve

high-accuracy sensorless constant current control.

ActiveCC eliminates the expensive, high accuracy

current sense resistor, making it ideal for CLA

applications.

ACT4533C integrates adaptive gate drive to

achieve

excellent

EMI

performance

passing

EN55022 Class B EMC standard without adding

additional EMI components while maintaining high

conversion efficiency.

Protection features include cycle-by-cycle current

limit, thermal shutdown, and frequency foldback at

short circuit. The devices are available in a SOP-

8EP package and require very few external devices

for operation.

ACT4533C

Wide-Input Sensorless CC/CV Step-Down DC/DC Converter

Rev 1, 14-Nov-14

Output Current (A)

1.4

1.6

1.8

2.0

2.2

2.4

2.6

2.8

3.0

6.0

5.0

4.0

3.0

2.0

1.0

0.0

CC/CV Curve