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AAT1153 Datasheet(PDF) 18 Page - Advanced Analogic Technologies

No. de pieza AAT1153
Descripción Electrónicos  2A Step-Down Converter
PDF  19 Pages
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Fabricante Electrónico  ANALOGICTECH [Advanced Analogic Technologies]
Página de inicio  http://www.analogictech.com
Logo ANALOGICTECH - Advanced Analogic Technologies

AAT1153 Datasheet(HTML) 18 Page - Advanced Analogic Technologies

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AAT1153
2A Step-Down Converter
PRODUCT DATASHEET
18
1153.2008.02.1.2
www .analogictech.com
AAT1153
2A Step-Down Converter
PRODUCT DATASHEET
18
1153.2008.02.1.2
www .analogictech.com
Input Capacitor
Input ripple VPP = 25mV
CIN(MIN) =
=
= 13.9µF; use 22µF
1
⎛⎞
- ESR
·
4 · fS
⎝⎠
VPP
IO
1
⎛⎞
- 0.01
·
4 · 1.2 · 106
⎝⎠
0.025
2
IO
RMS
I
PCIN = ESR · IRMS2 = 0.01 · 12 = 10mW
2
2
2
=
=
= 1Arms
AAT1153 Losses
P
TOTAL = IO
2 · R
DS(ON)P · D + IO
2 · R
DS(ON)N · (1 - D) + (tSW · fS · IO) · VIN
= 22 · 0.135 ·
+ 22 · 0.095 · 1 -
1.8
4.2
+ (5 · 10-9 · 1.2 · 106 · 2) · 4.2 = 498.9mW
1.8
4.2
⎛⎞
⎝⎠



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