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AME5296 Fiches technique(PDF) 9 Page - Analog Microelectronics

No de pièce AME5296
Description  Step Down DC/DC Converter
Download  14 Pages
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Fabricant  AME [Analog Microelectronics]
Site Internet  http://www.ame.com.tw/
Logo AME - Analog Microelectronics

AME5296 Fiches technique(HTML) 9 Page - Analog Microelectronics

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AME
9
AME5296
Rev. A.05
2A, 18V, 500KHz Synchronous
StepDownDC/DC Converter
When using tantalum or electrolytic capacitors, the ESR dominates the impedance at the switching frequency. For
simplification, the output ripple can be approximated to:
Setting the Output Voltage
The output voltage is using a resistive voltage divider connected from the output voltage to feedback pin. It divides the
output voltage down to the feedback voltage by the ratio:
The output voltage is:
ESR
IN
OUT
OUT
OUT
R
V
V
1
L
f
V
V
×
×
×
=
2
1
2
OUT
FB
R
R
R
V
V
+
×
=
2
2
1
OUT
R
R
R
8
.
0
V
+
×
=
n
Typical Application Circuits
VOUT(V)
R1(K
Ω)
R2(K
Ω)
R3(K
Ω)
L(
µH)
CIN(µF)
COUT(µF)
1.0
20.5
82.0
82
1.5
22
22x2
1.2
30.1
60.4
82
1.5
22
22x2
1.8
40.2
32.4
56
2.2
22
22x2
2.5
40.2
19.1
33
3.3
22
22x2
3.3
40.2
12.7
33
4.7
22
22x2
5.0
40.2
7.68
33
6.8
22
22x2
VCC
BST
IN
FB
SS
EN
SW
GND
AME5296
C3
1uF
Ren2
10K
C6
15pF
R5
0
C4
0.1uF
R4
10
Ren1
18K
CIN2
NS
CIN1
22uF
C5
22nF
L1
4.7uH
R1
40.2K
R3
33K
R2
12.7K
COUT1
22uF
COUT2
22uF
VIN
4.5V~18V
VOUT
3.3V/2A


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