DataSheet8.cn


PDF ( 数据手册 , 数据表 ) AX3131

零件编号 AX3131
描述 PWM Control 3A Step-Down Converter
制造商 Axelite
LOGO Axelite LOGO 


1 Page

No Preview Available !

AX3131 数据手册, 描述, 功能
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







AX3131 pdf, 数据表
AX3131
Where is inductor Ripple Current. Large value inductors lower ripple current and
small value inductors result in high ripple currents. Choose inductor ripple current
approximately 15% of the maximum load current 3A, ΔIL=0.45A. The DC current rating of
the inductor should be at least equal to the maximum load current plus half the ripple
current to prevent core saturation (3A+0.23A).
Input Capacitor Selection
The input capacitor reduces the surge current drawn from the input and switching
noise from the device. The input capacitor impedance at the switching frequency shall be
less than input source impedance to prevent high frequency switching current passing to
the input. A low ESR input capacitor sized for maximum RMS current must be used.
The capacitor voltage rating should be at least 1.5 times greater than the input
voltage, and often much higher voltage ratings are needed to satisfy.
Output Capacitor Selection
The output capacitor is required to keep the output voltage ripple small and to ensure
regulation loop stability. The output capacitor must have low impedance at the switching
frequency. A low ESR capacitor sized for maximum RMS current must be used. The low
ESR requirements needed for low output ripple voltage.
The capacitor voltage rating should be at least 1.5 times greater than the input
voltage, and often much higher voltage ratings are needed to satisfy.
8/14
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.3 Aug.20, 2010
http://www.Datasheet4U.com














页数 14 页
下载[ AX3131.PDF 数据手册 ]


分享链接

Link :

推荐数据表

零件编号描述制造商
AX3130PWM Control 2A Step-Down ConverterAXElite
AXElite
AX3131PWM Control 3A Step-Down ConverterAxelite
Axelite
AX3132PWM Control 2A Step-Down ConverterAXElite
AXElite
AX3133PWM Control 3A Step-Down ConverterAXElite
AXElite

零件编号描述制造商
STK15C88256-Kbit (32 K x 8) PowerStore nvSRAMCypress Semiconductor
Cypress Semiconductor
NJM4556DUAL HIGH CURRENT OPERATIONAL AMPLIFIERNew Japan Radio
New Japan Radio
EL1118-G5 PIN LONG CREEPAGE SOP PHOTOTRANSISTOR PHOTOCOUPLEREverlight
Everlight


DataSheet8.cn    |   2020   |  联系我们   |   搜索  |  Simemap