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PDF AX5203 Data sheet ( Hoja de datos )
| Número de pieza | AX5203 | |
| Descripción | Step-up PWM DC/DC Converter | |
| Fabricantes | AXElite | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AX5203 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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AX5203
Step-up PWM DC/DC Converter
GENERAL DESCRIPTION
The AX5203 is high efficient step-up DC/DC converter. Large output current is
possible having a built in internal N channel MOSFET, and using an external coil and
diode.
The AX5203 can be operated at switching frequencies of 500 kHz allowing for easy
filtering and low noise, the size of the external components can be reduced.
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
soft-start time can be programmed by outside capacitor; the function prevents overshoot at
startup. Build inside Current limit, Thermal Shutdown and enable functions.
FEATURES
- Input voltage：4.5V to 23V
- Output voltage：5 V to 68V
- Duty ratio：0% to 85% PWM control
- Oscillation frequency：500KHz.
- Enable and Thermal Shutdown function.
- Internal Current limit.
- Built-in N-channel MOSFET
- SOP-8L with Exposed pad Pb-Free package.
BLOCK DIAGRAM
Vcc
Phase
FB
Compensation
Regulator
+
-
Vref=1.0V
PWM
Controller
+
-
Oscillator
Buffer
Driver
EN
VEN
8uA
Thermal
Shutdown
0.06V
SW
SS
SGND
PGND
1/8
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.3 Jan.25, 2011
1 page  
AX5203
V 1.0V 1 R4
OUT R3
Table 1 Resistor select for output voltage setting
VOUT
R3
R4
12V 1K 11K
18V 1K 17K
24V 1.3K 30K
40V 1K 39K
65V 1K 64K
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 1.6A, ΔIL=0.24A.
VOUT
L1 Value
Table 2 Inductor select for output voltage setting (VCC=12V)
18V 24V 40V 65V
33uH
47uH
68uH
82uH
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 (1.6A+0.12A).
5/8
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.3 Jan.25, 2011
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet AX5203.PDF ] | |
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