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PDF AX3131 Data sheet ( Hoja de datos )
| Número de pieza | AX3131 | |
| Descripción | PWM Control 3A Step-Down Converter | |
| Fabricantes | Axelite | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AX3131 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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AX3131
PWM Control 3A Step-Down Converter
GENERAL DESCRIPTION
AX3131 consists of step-down switching regulator with PWM control. These devise
include a reference voltage source, oscillation circuit, error amplifier, internal PMOS and
etc.
AX3131 provides low-ripple power, high efficiency, and excellent transient
characteristics. The PWM control circuit is able to the duty ratio linearly form 0 up to 100%.
The converter frequency can be set by outside resistance. The wide range is from 200K to
1.3MHz. AX3131 is build out soft start function that prevent inrush current and overshooting.
A shutdown switch, over current protect and short circuit protect functions are built inside,
and when SCP happens, the operation frequency will be reduced to 150K. Also, an
external compensation block is built in to good stable system.
With the addition of an internal P-channel Power MOS, a coil, capacitors, and a diode
connected externally, these ICs can function as step-down switching regulators. They
serve as ideal power supply units for portable devices when coupled with the SOP-8L with
exposed pad package, providing such outstanding features as low current consumption.
Since this converter can accommodate an input voltage up to 23V, it is also suitable for the
operation via an AC adapter.
FEATURES
- Input voltage 4.5V to 23V
- Output voltage VFB to VCC
- Duty ratio 0% to 100% PWM control
- Oscillation frequency 200K~1.3MHz (Outside resistance setting)
- Current Limit (CL), Short Current Protection (SCP)
- External Soft-Start function and Shutdown Function.
- Thermal Shutdown function.
- Built-in internal SW P-channel MOS.
- SOP-8L with exposed pad Pb-Free package.
1/14
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.3 Aug.20, 2010
http://www.Datasheet4U.com
1 page  
(2) Stable Range
AX3131
DutyCycle(%)
=
VOUT
VIN
× 100
FUNCTION DESCRIPTIONS
PWM Control
The AX3131 consists of DC/DC converters that employ a pulse-width
modulation (PWM) system. In converters of the AX3131, the pulse width varies in a range
from 0 to 100%, according to the load current. The ripple voltage produced by the switching
can easily be removed through a filter because the switching frequency remains constant.
The AX3131 frequency can be set by outside resistance that wide range from 200K to
1.3MHz. Therefore, these converters provide a low-ripple power over broad ranges of input
voltage and load current.
Setting the Output Voltage
Application circuit item shows the basic application circuit with adjustable output
version. The external resistor sets the output voltage according to the following equation:
V 0.6V 1 R1
OUT R3
5/14
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.3 Aug.20, 2010
http://www.Datasheet4U.com
5 Page 
TYPICAL CHARACTERISTICS (CONTINUOUS)
AX3131
11/14
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.3 Aug.20, 2010
http://www.Datasheet4U.com
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet AX3131.PDF ] | |
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