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PDF AX3115 Data sheet ( Hoja de datos )
| Número de pieza | AX3115 | |
| Descripción | PWM Control 3A Step-Down Converter | |
| Fabricantes | AXElite | |
| Logotipo |  |
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AX3115
PWM Control 3A Step-Down Converter
GENERAL DESCRIPTION
AX3115 consists of step-down switching regulator with PWM control. These devise
include a reference voltage source, oscillation circuit, error amplifier, internal PMOS and
etc.
AX3115 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%.
An enable function, 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. Also,
an internal compensation block is built in to minimum external component count.
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 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：1.222V to VCC
- Duty ratio：0% to 100% PWM control
- Oscillation frequency：380KHz typ.
- Current Limit (CL), Enable function.
- External Soft-Start function.
- Thermal Shutdown function.
- Short Circuit Protect (SCP).
- Built-in internal SW P-channel MOS.
- SOP-8L Pb-Free package.
1/7
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.2 Aug.18, 2010
1 page  
AX3115
Table 1 Resistor select for output voltage setting
VOUT
R2
R4
5V 5.6K 1.8K
3.3V 5.6K 3.3K
2.5V 1.25K 1.2K
1.8V 2.2K 4.7K
1.5V 1.1K 4.7K
Inductor Selection
For most designs, the operating inductor range is 15µH to 22µH. The inductor value
can be derived from the following equation:
V V V
OUT
L V I f
IN
IN
L
OUT
OSC
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+0.45A).
Input Capacitor
The input current to the step-down converter is discontinuous, and so a capacitor is
required to supply the AC current to the step-down converter while maintaining the DC
input voltage. A low-ESR capacitor is required to keep the noise at the IC to a minimum.
The low-ESR electrolytic capacitor may also suffice. The input capacitor value should be
greater than 470µF. However since it absorbs the input switching current it requires an
adequate ripple current rating. Its RMS current rating should be greater than approximately
1/2 of the DC load current. For insuring stable operation CIN should be placed as close to
the IC as possible. Alternately a smaller high quality ceramic 0.1uF capacitor may be
placed closer to the IC and a larger capacitor placed further away. If using this technique, it
is recommended that the larger capacitor be a electrolytic type.
Output Capacitor
The output capacitor is required to maintain the DC output voltage. Low ESR
capacitors are preferred to keep the output voltage ripple low. The characteristics of the
output capacitor also affect the stability of the regulation control system. The low-ESR
electrolytic capacitors are recommended. The output capacitor value should be greater
than 470µF.
5/7
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.2 Aug.18, 2010
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet AX3115.PDF ] | |
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