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PDF AX2001 Data sheet ( Hoja de datos )
| Número de pieza | AX2001 | |
| 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 AX2001 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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AX2001/A
1A, 0.25V Feedback Voltage Step-Down
Switching Regulators for LED Driver
GENERAL DESCRIPTION
AX2001/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.
AX2001/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：4.5V to 23V
- Output voltage：0.25V to VCC
- LED Backlight and High Power LED Application
- Duty ratio：0% to 100% PWM control
- Oscillation frequency：
AX2001: 330KHz typ.
AX2001A: 500KHz typ.
- Enable/Disable function.
- Current Limit (CL), Thermal Shutdown and Short Circuit Protections (SCP).
- Built-in internal SW P-channel MOS.
- No output capacitor is stable.
- SOP-8L Pb-Free package.
1/8
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.2 Oct.21, 2011
1 page  
AX2001/A
(2) Add 4.7uF Output Capacitor
AC
12V IN
AC D4
AC D3
AC D2
AC D1
C3
C2 0.1u
U1
1 FB
2 EN
3 COMP
4 VCC
VSS
VSS
SW
SW
8
7
6
5
R5
100R
C4
AX2001/A
C5
100n
L1
D5
B240A
VOUT
D2
LED
C1
4.7u
R2
Part No.
AX2001
AX2001A
ILED
350mA
750mA
350mA
750mA
0.715Ω
0.333Ω
0.715Ω
0.333Ω
R2
87.5mW
189mW
87.5mW
189mW
FUNCTION DESCRIPTIONS
PWM Control
C2
100uF
220uF
100uF
220uF
C4
10nF
3.3nF
L1
33uH
22uH
The AX2001/A consists of DC/DC converters that employ a pulse-width modulation
(PWM) system. In converters of the AX2001/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 AX2001/A adjustable
output version. The external resistor sets the LED output current according to the following
equation:
I LED
0.25V
R2
5/8
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.2 Oct.21, 2011
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet AX2001.PDF ] | |
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