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PDF ACT4533A Data sheet ( Hoja de datos )
| Número de pieza | ACT4533A | |
| Descripción | Wide-Input Sensorless CC/CV Step-Down DC/DC Converter | |
| Fabricantes | Active-Semi | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ACT4533A (archivo pdf) en la parte inferior de esta página. Total 18 Páginas | ||
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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 ([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
0.25Ω
• ±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
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.
1 page  
FUNCTIONAL BLOCK DIAGRAM FOR ACT4533A
ACT4533A/B
Rev 0, 14-Aug-13
FUNCTIONAL BLOCK DIAGRAM FOR ACT4533B
FUNCTIONAL DESCRIPTION
CV/CC Loop Regulation
As seen in Functional Block Diagram, the
ACT4533A/B is a peak current mode pulse width
modulation (PWM) converter with CC and CV
control. The converter operates as follows:
A switching cycle starts when the rising edge of the
Oscillator clock output causes the High-Side Power
Switch to turn on and the Low-Side Power Switch to
turn off. With the SW side of the inductor now
connected to IN, the inductor current ramps up to
store energy in the magnetic field. The inductor
current level is measured by the Current Sense
Amplifier and added to the Oscillator ramp signal. If
the resulting summation is higher than the COMP
voltage, the output of the PWM Comparator goes
high. When this happens or when Oscillator clock
output goes low, the High-Side Power Switch turns
off.
At this point, the SW side of the inductor swings to
a diode voltage below ground, causing the inductor
current to decrease and magnetic energy to be
transferred to output. This state continues until the
cycle starts again. The High-Side Power Switch is
Innovative PowerTM
- 5 - www.active-semi.com
Copyright © 2013 Active-Semi, Inc.
5 Page 
Figure 9:
Typical Application Circuit for 5V/2.4A Car Charger with OVP Circuit
ACT4533A/B
Rev 0, 14-Aug-13
Table 2:
BOM List for 5V/2.4A Car Charger
ITEM REFERENCE
DESCRIPTION
1 U1 IC, ACT4533AYH, SOP-8EP
2 C1 Capacitor, Electrolytic, 47µF/50V, 6.3х7mm
3 C2 Capacitor, Ceramic, 10µF/50V, 1206, SMD
4 C3 Capacitor, Ceramic, 2.2nF/6.3V, 0603, SMD
5 C4 Capacitor, Ceramic, 22nF/50V, 1206, SMD
6 C5 Capacitor, Ceramic, 1nF/10V, 0603, SMD
7 C6 Capacitor, Ceramic, 10µF/10V, 0603, SMD
8 C7 Capacitor, Electrolytic, 220uF/10V, 6.3х7mm
9 L1 Inductor, 40µH, 5A, 20%, SMD
10 D1 Diode, Schottky, 40V/5A, SK54BL
11 R1 Chip Resistor, 7.87kΩ, 0603, 1%
12 R2 Chip Resistor, 51kΩ, 0603, 1%
13 R3 Chip Resistor, 15kΩ, 0603, 5%
14 R4 Chip Resistor, 9.76kΩ, 0603, 1%
15 R5 Chip Resistor, 100kΩ, 0603, 1%
16 R6 Chip Resistor, 15kΩ, 0603, 1%
MANUFACTURER
Active-Semi
Murata, TDK
Murata, TDK
Murata, TDK
Murata, TDK
Murata, TDK
Murata, TDK
Murata, TDK
Tyco Electronics
Diodes
Murata, TDK
Murata, TDK
Murata, TDK
Murata, TDK
Murata, TDK
Murata, TDK
QTY
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Innovative PowerTM
- 11 -
www.active-semi.com
Copyright © 2013 Active-Semi, Inc.
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet ACT4533A.PDF ] | |
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