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PDF AX2003A Data sheet ( Hoja de datos )
| Número de pieza | AX2003A | |
| Descripción | 0.25V Feedback Voltage Step-Down Switching Regulators | |
| Fabricantes | AXElite | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AX2003A (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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AX2003/A
3A, 0.25V Feedback Voltage Step-Down
Switching Regulators for LED Driver
GENERAL DESCRIPTION
AX2003/A consists of step-down switching regulator with PWM control. These
devise include a reference voltage source, oscillation circuit, error amplifier, internal
PMOS and etc.
AX2003/A provides low-ripple power, high efficiency, and excellent transient
characteristics. The PWM control circuit is able to the duty ratio linearly from 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：0.25V to Vcc
- LED Backlight and High Power LED Application
- Duty ratio：0% to 100% PWM control
- Oscillation frequency：
AX2003 : 330KHz typ.
AX2003A: 500KHz typ.
- Enable/Disable function.
- Current Limit (CL), Thermal Shutdown and Short Circuit Protections (SCP).
- Built-in internal SW P-channel MOS.
- Low ESR output capacitor (Multi-layer chip capacitor (MLCC)) application.
- SOP-8L Pb-Free package.
1/8
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.3 Feb.16, 2009
www.DataSheet.in
1 page  
LED Driver (3A, 0.25V FB Voltage) AX2003
(2) Add 4.7uF Output Capacitor
AC
12V IN
AC D4
AC D3
AC D2
AC D1
C3
C2 0.1u
R5
100R
C4
U1
1 FB
2 EN
3 COMP
4 VCC
VSS
VSS
SW
SW
8
7
6
5
AX2003/A
C5
100n
L1
D5
B240A
VOUT
D2
LED
C1
4.7u
R2
Part No.
AX2003
AX2003A
ILED
350mA
750mA
1000mA
350mA
750mA
1000mA
R2
0.715Ω 87.5mW
0.333Ω 189mW
0.250Ω 250mW
0.715Ω 87.5mW
0.333Ω 189mW
0.250Ω 250mW
C2
100uF
220uF
330uF
100uF
220uF
330uF
C4
10nF
3.3nF
L1
33uH
22uH
Function Descriptions
PWM Control
The AX2003/A consists of DC/DC converters that employ a pulse-width modulation
(PWM) system. In converters of the AX2003/A, the pulse width varies in a range from 0
to 100%, according to the load current. The ripple voltage produced by the switching can
easily be removed through a filter because the switching frequency remains constant.
Therefore, these converters provide a low-ripple power over broad ranges of input
voltage and load current.
Setting the ILED Current
Application circuit item shows the basic application circuit with AX2003/A adjustable
output version. The external resistor sets the LED output current according to the
following equation:
5/8
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.3 Feb.16, 2009
www.DataSheet.in
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet AX2003A.PDF ] | |
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