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PDF AX4101 Data sheet ( Hoja de datos )
| Número de pieza | AX4101 | |
| Descripción | PWM Control 2.5A Step-Down Converter | |
| Fabricantes | AXElite | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AX4101 (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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AX4101
PWM Control 2.5A Step-Down Converter
GENERAL DESCRIPTION
AX4101 consists of step-down switching regulator with PWM control. These devise
include a reference voltage source, oscillation circuit, error amplifier, internal PMOS and
etc.
AX4101 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：3.6V to 23V
- Output voltage：0.8V to VCC
- Duty ratio：0% to 100% PWM control
- Oscillation frequency：330KHz typ.
- Current Limit (CL), Enable function.
- Thermal Shutdown function.
- Short Circuit Protect (SCP).
- Built-in internal SW P-channel MOS.
- SOP-8L Pb-Free package.
1/9
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.6 Aug.06, 2010
1 page  
AX4101
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 OUT
0.8V
1
R1
R2
Table 1 Resistor select for output voltage setting
VOUT
R2
R1
5V
1.3K 6.8K
5.6K 30K
3.3V
1.5K
5.6K
4.7K
18K
2.5V 2.2K 4.7K
1.8V 2K 2.5K
1.5V 2.2K 2.0K
1.2V 3K 1.5K
1.0V 3K 0.75K
The R2 setting 5.6k that No load current can be reduce to under 4mA for EL CAP.
Inductor Selection
For most designs, the operates with inductors of 15µH to 33µH. The inductor value
can be derived from the following equation:
V V V
OUT
IN OUT
L V I f
IN L 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 2.5A, ΔIL=0.375A. 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 (2.5A+0.19A).
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
220µF low ESR capacitor for most applications is sufficient.
5/9
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.6 Aug.06, 2010
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet AX4101.PDF ] | |
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