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PDF AX5301 Data sheet ( Hoja de datos )
| Número de pieza | AX5301 | |
| Descripción | PWM Step-up Controller | |
| Fabricantes | AXElite | |
| Logotipo |  |
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AX5301 (Preliminary)
PWM Step-up Controller
GENERAL DESCRIPTION
The AX5301 is high efficient PWM step-up controller. Designed to drive an external
N-channel MOSFET, Output voltage is programmable with 1.0V of standard voltage
supply internal, and using externally connected components, output voltage (FB) can be
set up at will.
The AX5301 can be operated at switching frequencies of 500kHz allowing for easy
filtering and low noise, the size of the external components can be reduced.
This controller also contains an error amplifier circuit as well as a soft-start circuit
that prevents inrush-current at startup. An enable function and thermal shutdown
functions are built inside.
FEATURES
- Input voltage: 3.0V to 24V
- Output voltage: Define by N-channel MOS.
- Duty ratio: 0% to 80% PWM control
- Oscillation frequency: 500KHz (±20%) .
- Enable function
- Soft-Start function
- Thermal Shutdown function
- External SW N-channel MOS.
- MSOP-8L & SOP-8L Pb-Free Package.
1/10
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.0.1 Jun.30, 2006
1 page  
AX5301 (Preliminary)
Function Descriptions
PWM Control
The AX5301 is high efficient PWM step-up controller. In controllers of the AX5301, the
pulse width varies in a range from 0 to 90%, 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, AX5301 provide a low-ripple power
over broad ranges of input voltage and load current.
Setting the Output Voltage
Application circuit item shows the basic application circuit with AX5301 adjustable
output version. The external resistor sets the output voltage according to the following
equation:
V OUT
= 1.0V
× ⎜⎛1 +
⎝
R1 ⎟⎞
R2 ⎠
Table 1 Resistor select for output voltage setting
VOUT
R2
R1
12V 1.1K 11K
15V 1.5K 21K
18V 1K 17K
24V 1.3K 30K
Inductor Selection
For most designs, Low inductance values are physically smaller but require faster
switching, which results in some efficiency loss. The inductor value can be derived from
the following equation:
V (V V )× −
= IN
OUT
IN
L V ∆I f×
OUT
×
L LX
Where is inductor Ripple Current. Large value inductors lower ripple current and
small value inductors result in high ripple currents. Choose inductor ripple current
approximately 15% of the maximum input current 3A, ∆IL=0.45A.
Table 2 Inductor select for output voltage setting (VCC=6V)
VOUT
L1 Value
9V
18uH
12V
22uH
15V
25uH
18V
27uH
The DC current rating of the inductor should be at least equal to the maximum load
current plus half the ripple current to prevent core saturation (3A+0.25A).
5/10
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.0.1 Dec.21, 2006
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet AX5301.PDF ] | |
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