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PDF AX5204 Data sheet ( Hoja de datos )
| Número de pieza | AX5204 | |
| Descripción | Step-up PWM DC/DC Converter | |
| Fabricantes | AXElite | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AX5204 (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
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AX5204
Step-up PWM DC/DC Converter
GENERAL DESCRIPTION
The AX5204 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 AX5204 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：3V to 20V
- Output voltage：3.3V to 32V
- 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
1/10
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.5 Jan.25, 2011
1 page  
AX5204
Table 1 Resistor select for output voltage setting
VOUT
R3
R4
12V 1K 11K
15V 1.3K 18K
18V 1.3K 22K
24V 1.3K 30K
32V 2.2K 68K
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.
Table 2 Inductor select for output voltage setting (VCC=5V)
VOUT 9V 12V 15V 18V
L1 Value 18uH 22uH 25uH 33uH
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).
Input Capacitor Selection
The input capacitor reduces the surge current drawn from the input and switching
noise from the device. The input capacitor impedance at the switching frequency shall be
less than input source impedance to prevent high frequency switching current passing to
the input. A low ESR input capacitor sized for maximum RMS current must be used.
The capacitor voltage rating should be at least 1.5 times greater than the input
voltage, and often much higher voltage ratings are needed to satisfy.
5/10
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.5 Jan.25, 2011
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet AX5204.PDF ] | |
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