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EA4533AYH Datasheet, PDF (1/17 Pages) Active-Semi, Inc – Wide-Input Sensorless CC/CV Step-Down DC/DC Converter | |||
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ACT4533A/B
Rev 0, 14-Aug-13
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 12V
⢠125kHz Switching Frequency Eases EMI Design
⢠91% Efficiency (Vout=5V@2.4A 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
â Current Limit from 1.5A to 4.0A
â Patented Cable Compensation from 0 to
0.25â¦
⢠±7.5% CC Accuracy
â Compensation of Input /Output Voltage Change
â Temperature Compensation
â Independent of inductance and Inductor DCR
⢠2% Feedback Voltage Accuracy
⢠Advanced Feature Set
â Integrated Soft Start
â Thermal Shutdown
â Secondary Cycle-by-Cycle Current Limit
â Protection Against Shorted ISET Pin
⢠SOP-8EP Package
APPLICATIONS
⢠Car Charger/ Adaptor
⢠Rechargeable Portable Devices
⢠General-Purpose CV/CC Power Supply
GENERAL DESCRIPTION
ACT4533A/B 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. ACT4533A/B
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.
ACT4533A/B 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.
The only difference between ACT4533A and
ACT4533B is that Pin 7 provides OVP for
ACT4533A and EN/OVP for ACT4533B.
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 © 2013 Active-Semi, Inc.
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