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ACT4533C fiches techniques PDF

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

Numéro de référence ACT4533C
Description Wide-Input Sensorless CC/CV Step-Down DC/DC Converter
Fabricant Active-Semi 
Logo Active-Semi 





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ACT4533C fiche technique
ACT4533C
Rev 1, 14-Nov-14
Wide-Input Sensorless CC/CV Step-Down DC/DC Converter
FEATURES
40V Input Voltage Surge
36V Steady State Operation
Up to 3.5A output current
Output Voltage up to 18V
125kHz Switching Frequency Eases EMI Design
91% Efficiency ([email protected] at Vin=12V)
Stable with Low-ESR Ceramic Capacitors to
Allow Low-Profile Designs
Integrated Over Voltage Protection
Excellent EMI Performance
Patented ActiveCC Sensorless Constant Current
Control Improves Efficiency and Lowers Cost.
Resistor Programmable
Current Limit from 1.5A to 4.0A
Patented Cable Compensation from 0 to
0.25
±7.5% CC Accuracy
Compensation of Input /Output Voltage Change
Temperature Compensation
Independent of inductance and Inductor DCR
2% Feedback Voltage Accuracy
Advanced Feature Set
Integrated Soft Start
Thermal Shutdown
Secondary Cycle-by-Cycle Current Limit
Protection Against Shorted ISET Pin
SOP-8EP Package
APPLICATIONS
Car Charger/ Adaptor
Rechargeable Portable Devices
General-Purpose CV/CC Power Supply
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.
Innovative PowerTM
-1-
CC/CV Curve
6.0
VIN = 24V
5.0
VIN = 18V
4.0
3.0
VIN = 12V
2.0
1.0
0.0
1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0
Output Current (A)
www.active-semi.com
Copyright © 2014 Active-Semi, Inc.

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