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PDF AX5302 Data sheet ( Hoja de datos )
| Número de pieza | AX5302 | |
| Descripción | PWM Step-up Controller | |
| Fabricantes | AXElite | |
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AX5302
PWM Step-up Controller
GENERAL DESCRIPTION
The AX5302 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 AX5302 can be operated at switching frequencies of 500kHz allowing for easy
filtering and low noise, the size of the external components can be reduced. An enable
function and thermal shutdown functions are built inside. The soft-start time can be
programmed by outside capacitor; the function prevents overshoot at startup.
FEATURES
- Input voltage: 3.0V to 24V
- Output voltage: Define by N-channel MOS
- Duty ratio: 0% to 85% PWM control
- Oscillation frequency: 500KHz (±20%)
- Soft-start time is programmed by outside capacitor
- Current Limit is setting by outside resistance
- Thermal shutdown protection
- Enable/shutdown function
- External SW N-channel MOS.
- SOP-8L Pb-Free Package.
BLOCK DIAGRAM
Vcc
Phase
FB
Compensation
Regulator
+
-
Vref=1.0V
+
-
PWM
Controller
Oscillator
EN
VEN 8uA
Thermal
Shutdown
0.06V
Buffer
Driver
GATE
GND
SS
SENSE
1/8
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.1 Aug.24, 2010
1 page  
AX5302
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, ΔIL=0.45A.
Table 2 Inductor select for output voltage setting (VCC=5V)
VOUT 9V 12V 15V 18V
L1 Value
18uH
15uH
10uH
10uH
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).
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.
5/8
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.1 Aug.24, 2010
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet AX5302.PDF ] | |
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