AX5201 Ver la hoja de datos (PDF) - Unspecified
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AX5201 Datasheet PDF : 10 Pages
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AX5201
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 2.4A, ΔIL=0.18A.
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 (2.4A+0.18A).
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.1.4 Jan.25, 2011
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