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PDF AX3162 Data sheet ( Hoja de datos )
| Número de pieza | AX3162 | |
| Descripción | PWM Control 2A Step-Down Converter | |
| Fabricantes | AXElite | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AX3162 (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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AX3162
PWM Control 2A Step-Down Converter
GENERAL DESCRIPTION
AX3162/A consists of step-down switching regulator with PWM control. These devise
include a reference voltage source, oscillation circuit, error amplifier, internal PMOS and
etc.
AX3162/A 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%.
This converter is build out soft start function that prevents overshoot and inrush current at
startup. An over current protect function and short circuit protect function are built inside,
and when OCP or SCP happens, the operation frequency will be reduced. An external
compensation is easily to system stable; the low ESR output capacitor can be used.
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 58V, it is also suitable for the
operation via an AC adapter.
FEATURES
- Input voltage：10V to 58V
- Output voltage：3.3V to 56V
- Duty ratio：0% to 100% PWM control
- Enable and Soft-Start function
- Current Limit, Short Circuit Protect (SCP) and Thermal Shutdown protection
- Built-in internal SW P-channel MOS.
- SOP-8L-EP Pb-Free package.
1/9
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.5 Sep.28, 2011
1 page  
AX3162
APPLICATION INFORMATION
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:
VOUT
=
1.0V
×
(1+
R1
R4
)
Table 1 Resistor select for output voltage setting
VOUT
R4
5V 1.5K
R1
6K
3.3V 1.3K
3K
Inductor Selection
For most designs, the different frequency can be reducing the inductor value; The
AX3162/A is suggested 33µH. 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 20% of the maximum load current 2A, ΔIL=0.4A. 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 (2A+0.2A).
Input Capacitor Selection
This capacitor should be located close to the IC using short leads and the voltage
rating should be approximately 1.5 times the maximum input voltage. The RMS current
rating requirement for the input capacitor of a buck regulator is approximately 1⁄2 the DC
load current. A low ESR input capacitor sized for maximum RMS current must be used. A
470µF low ESR capacitor for most applications is sufficient.
5/9
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.5 Sep.28, 2011
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet AX3162.PDF ] | |
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