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PDF AX3116 Data sheet ( Hoja de datos )
| Número de pieza | AX3116 | |
| Descripción | PWM Control 5A Step-Down Converter | |
| Fabricantes | AXElite | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AX3116 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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AX3116
PWM Control 5A Step-Down Converter
GENERAL DESCRIPTION
AX3116 consists of step-down switching regulator with PWM control. These devise
include a reference voltage source, oscillation circuit, error amplifier, internal PMOS and
etc.
AX3116 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-EP
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：0.8V to VCC
- Duty ratio：0% to 100% PWM control
- Oscillation frequency：330KHz 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 with Exposed Pad Pb-Free package.
1/8
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.4 Aug.18 2010
1 page  
AX3116
V 0.8V 1 R5
OUT R6
Table 1 Resistor select for output voltage setting
VOUT
R6
R5
5V 1.3K 6.8K
3.3V 1.5K 4.7K
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
RDS (ON) Current Limiting
The current limit threshold is setting by the external resistor (R2) connecting from VCC
supply to OCSET pin. The internal 110uA sink current crossing the resistor sets the voltage
at pin of OCSET. When the PWM voltage is less than the voltage at OCSET, an
over-current condition is triggered. Please refer to the formula for setting the current limit
value:
ISW(MIN)
IOCSET R2
RDS(ON)
0.05
(Normally, The ISW(MAX) setting more than IOUT 1.0A .)
Example:
ISW = (110u x 2K + 0.05)/ 45m= 6.67A (VIN=12V)
ISW = (110u x 3.75K + 0.05)/ 70m= 6.6A (VIN=5V)
Inductor Selection
(TA=25°C)
For most designs, the operating inductor range is 10µH to 15µH. The inductor value
can be derived from the following equation:
V V V
OUT
IN OUT
L V I f
IN L OSC
5/8
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.4 Aug.18 2010
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet AX3116.PDF ] | |
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