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AAT1102 Datasheet(PDF) 12 Page - Advanced Analog Technology, Inc.

Part # AAT1102
Description  ADVANCED PWM DC-DC CONVERTER WITH INTERNAL SWITCH AND SOFT-START
PDF  18 Pages
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Manufacturer  AAT [Advanced Analog Technology, Inc.]
Direct Link  http://www.aatech.com.tw
Logo AAT - Advanced Analog Technology, Inc.

AAT1102 Datasheet(HTML) 12 Page - Advanced Analog Technology, Inc.

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Advanced Analog Technology, Inc.
–
台灣類比科技股份有限公司 –
–
Advanced Analog Technology, Inc. –
Page 12 of 18
V5.0
AAT1102 (BIN2)
()
()
()⎥⎦
⎤
⎢
⎣
⎡
−
−
−
+
=
D
r
R
D
r
R
kg
CR
f
V
V
R
L
c
L
m
cs
ci
FB
o
c
1
1
2
2
π
FB
V
is equal to reference voltage,
REF
V
.
REF
V
=1.24V, k is the correct factor, and
)
8
6
(
−
=
k
5. The output filter capacitor is chosen so C .
L
R
pole cancels
c
R .
c
C
zero
()
⎟
⎠
⎞
⎜
⎝
⎛
+
−
=
c
L
c
c
r
R
C
C
R
2
3
1
, and
()
⎟
⎠
⎞
⎜
⎝
⎛
+
−
=
c
L
c
c
r
R
R
C
C
2
3
1
Example:
IN
V =5V,
O
V =9.6V,
O
I =250mA,
s
f =600 kHz,
FB
V
=1.25V,
uH
L
8
.
6
=
,
uS
g
m
105
=
,
275
.
0
=
cs
R
V/A,
Ω
= 1
.
0
L
r
,
Ω
= 23
.
0
DS
r
,
Ω
=
m
r
C
50
, k =7
Ω
= 4
.
1
F
R
,4
.
21
=
ci
f
kHz,
c
C =1.3nF,
c
R = 27k
Ω
, C =4.7uF
Fig.4. CH1: PWM waveform, CH2,
p
p
v −
for Vo
Fig.5. Bode diagram using Matlab simulation



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