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PDF AX4102 Data sheet ( Hoja de datos )
| Número de pieza | AX4102 | |
| Descripción | PWM Control 3.5A Step-Down Converter | |
| Fabricantes | AXElite | |
| Logotipo |  |
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AX4102
PWM Control 3.5A Step-Down Converter
GENERAL DESCRIPTION
AX4102 consists of step-down switching regulator with PWM control. These
devise include a reference voltage source, oscillation circuit, error amplifier, internal
PMOS and etc.
AX4102 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.
1/8
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.5 Sep.03, 2009
www.gofotech.com Tel: 0755-6135 8291/8292
1 page  
www.DataSheet4U.net
PWM Control 3.5A Step-Down Converter AX4102
Setting the Output Voltage
Application circuit item shows the basic application circuit with AX4102 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 reducing to under 4mA.
VIN>+9V
C2 C3
470uF 0.1uF
R4
100K
R3
1.5K
ON/OFF
C6
0.1uF
AX4102
1 FB
VSS 8
2 EN
VSS 7
3 OCSET SW 6
4 VCC
SW 5
L1
12
22uH
D1
B340
R1
30K
R2
5.6K
VOUT = 5V/3.5A
C1
1nF
C8 C4
0.1uF 470uF
PCB Layout Guide
If you need low Tc & Tj or large PD(Power Dissipation), The dual SW pins(5&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 & D1 as closely as possible.
5/8
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.5 Sep.03, 2009
www.gofotech.com Tel: 0755-6135 8291/8292
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet AX4102.PDF ] | |
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