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PDF AX3102 Data sheet ( Hoja de datos )
| Número de pieza | AX3102 | |
| Descripción | PWM Control 3A Step-Down Converter | |
| Fabricantes | AXElite | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AX3102 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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AX3102
PWM Control 3A Step-Down Converter
GENERAL DESCRIPTION
AX3102 consists of step-down switching regulator with PWM control. These devise
include a reference voltage source, oscillation circuit, error amplifier, internal PMOS and
etc.
AX3102 provides low-ripple power, high efficiency, and excellent transient
characteristics. The PWM control circuit is able to every the duty ratio linearly form 0 up to
100%. This converter also contains an error amplifier circuit as well as a soft-start circuit
that prevents overshoot at startup. 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.
- Soft-Start (SS), Current Limit (CL), Enable function.
- Thermal Shutdown function.
- Short Circuit Protect (SCP).
- Built-in internal SW P-channel MOS.
- SOP-8L Pb-Free package.
1/8
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.2.0 Aug.09, 2010
1 page  
AX3102
Setting the Output Voltage
Application circuit item shows the basic application circuit with AX3102 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
5.6K
4.7K
12K
1.8V 2K 2.5K
1.5V 2.2K 2.0K
1.2V 3K 1.5K
1.0V 3K 0.75K
R2 setting 5.6k that System Operation Current (No load) can be reduce to under 4mA.
VIN>+9V
C2 C3
470uF 0.1uF
R4
100K
R3
1.3K
ON/OFF
AX3102
1 FB
VSS 8
2 EN
VSS 7
3 OCSET SW 6
4 VCC
SW 5
1 L1 2
22uH
DB1340
R1
30K
R2
5.6K
C1
1nF
VOUT = 5V/3A
C8 C4
0.1uF 470uF
PCB Layout Guide
If you need low Tc and Tj or large PD (Power Dissipation), the dual SW pins (5 and 6)
on the SOP-8L package are internally connected to die pad, The PCB layout should allow
for maximum possible copper area at the SW pins.
1. Connect C3 to VCC pin as closely as possible to get good power filter effect.
2. Connect R3 to VCC pin as closely as possible.
3. Connect ground side of the C2 and D1 as closely as possible.
5/8
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.2.0 Aug.09, 2010
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet AX3102.PDF ] | |
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