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PDF ACE752D Data sheet ( Hoja de datos )
| Número de pieza | ACE752D | |
| Descripción | 120KHz 3.5A Buck DC-DC Converter | |
| Fabricantes | ACE Technology | |
| Logotipo |  |
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ACE752D
120KHz 3.5A Buck DC-DC Converter
Description
The ACE752D is a high efficiency step down DC-DC converter with adjustable current limit in compact
SOP-8/ESOP-8 packages, including an error amplifier, ramp generator, current comparator, slope
compensation, current sense and logic driver. It also integrates a current error amplifier to have a
constant voltage and constant current control. Peak current mode PWM control with external adjustable
compensation provides a stable and high efficient operation over a wide range of load currents. By
means of an on board current sense resistor and the availability of the current sense pins, a current limit
programming is very simple and accurate.The internal robust DMOS transistor with a typical of 150 mΩ
assures high efficiency even at high output current level. The internal limiting current of typical value of
3.5 A, output short and over temperature protection, protect the device from accidental damage. The
internal fixed switching frequency of 120 kHz, and the SOP-8/ESOP-8 packages pin allow building an
ultra compact DC/ DC converter with a minimum board space.
Features
• Up to 2.1A/2.4Aoutput current
• Input Under Voltage Lockout
• Operating voltage can be up to 40V
• 120 kHz Internal Jitter Frequency for lower EMI
• Patent-Technique Constant Voltage and Constant Current Control.
• Patent-Technique Output Voltage Compensation
• Adjustable current limit
• Over Temperature Protection
• Small SOP-8/ESOP-8 Packages
Application
• Car Charger/Adaptor
• Rechargeable Portable Devices
• General-purpose step-down converters with adjustable current limit
VER 1.1 1
1 page  
ACE752D
120KHz 3.5A Buck DC-DC Converter
APPLICATIONS INFORMATION
Output Voltage and Feedback Loop Settings
Refer to the figure 1, the output voltage of the switching regulator (VOUT) can be set with Equation
following:
VOUT = (1+
R3
R4
)X0.835V
The limit current is set by the external resistor R2:
ILIMIT =
70mV
R2
The ACE752D uses a patent-pending output voltage compensation scheme for the conductor wire loss
by properly selecting the value of R3, R4, if the conductor resistance is Rline, current sense resistor is R2
(Refer to the figure1), then:
R3 = Rline
200μ*R2
0.835*R3
R4 =
VOUT-0.835
For Rline=70mΩ, R2=33.3mΩ (2.1A current limit as figure 1), VOUT=5V:
R3=11k, R4=2.2k, choose R3=10k, R4=2k as the figure1.
Component Selection
Inductor Selection
The ACE752D can utilize small inductors due to its fast 120kHz switching frequency. Typically, a 100µH
inductor is recommended for most applications. Larger values of inductance will allow greater output
current capability by reducing the inductor ripple current. Increasing the inductance above will also
increase size.
The inductor current ripple is typically set for 20% to 40% of the maximum inductor current (IP). The
inductor should have low DCR (series resistance of the windings) to reduce the power losses, and must
be able to handle the peak inductor current without saturating. To minimize radiated noise, use a shielded
bobbin inductor.
Output and Input Capacitor Selection
Low ESR (equivalent series resistance) capacitors should be used to minimize the output voltage ripple.
The parallel of multilayer ceramic and electrolytic capacitors is an excellent choice as they have extremely
low ESR and are low cost.
A parallel of 10µF ceramic capacitor and 220µF electrolytic capacitor is sufficient for most applications.
Larger values may be used to obtain extremely low output voltage ripple and improve transient response.
Low ESR input capacitors reduce input switching noise and reduce the peak current drawn from the
battery. It follows that ceramic capacitors are also a good choice for input decoupling, and should be
located as close as possible to the device. A 10µF input capacitor is sufficient for virtually any application.
For all the ceramic capacitors above, X5R and X7R dielectric materials are preferred, for their ability to
maintain capacitance over wide voltage and temperature ranges.
VER 1.1 5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet ACE752D.PDF ] | |
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