AAT1164C Advanced Analog Technology, AAT1164C Datasheet - Page 19

• Manufacturer Part Number: AAT1164C
• Description: TRIPLE-CHANNEL TFT LCD POWER SOLUTION
• Manufacturer: Advanced Analog Technology

Compensator design guide:
1. Crossover frequency
2. Gain margin>10dB
3. Phase margin>45
4. The
the compensator resistance,
5. The output filter capacitor is chosen so
pole cancels
Example 3:
R
R
εR C
C
ε
r = 76.689 m
r
V = 5V,
V
L
C
IN
FB
C
C
C
=
= 9.13 m
C C
21.533µF
25.079µF
32.587µF
36.312µF
38.469µF
= 7.6 k ,
=
(1 ~ 3)
=
= 1.233V, L = 6.65µH,
C
V
C
V
εR
OUT
FB
OUT
O
L (s)
=
VI
C
C
2πf C
V = 13.3V,
OUT
Table 3. k Factor Table



O
,
R
R C
ci OUT CS
C
2
=
R = 0.7667
L
C C
OUT



g k
1
F
+
m
R
2
L
r
at crossover frequency, Therefore,
C
zero
∘
= 38.5
Best Corner
+
R
23.740kHz
21.842kHz
20.095kHz
15.649kHz
13.247kHz
Frequency



Advanced Analog Technology, Inc.
r
C
f
I = 300mA,
ci
O







, and
<
µ F
(
1 D R
1
2
g = 85µS,
−
R
m
,
f
S
, ε = 3,
C
(
C
R
C
)
L
= 1.95nF,
is determined by:
L
+
−
2r
f = 1,190kHz,
S
R
C
(
1 D
CS
)
−
k Factor
r
–
4.692
5.083
6.042
5.230
4.703
= 0.23V/A.
)




–
Advanced Analog Technology, Inc . –
台 灣 類 比 科 技 股 份 有 限 公 司
C
OUT L
Page 19 of 24
R
Version 1.00
Figure 7. Bode Plot of Loop Gain Using Matlab
Positive and Negative LDO Driver
Output Voltage Selection
The output voltage of positive LDO driver is set by a
resistive divider from the output (V
center tap connected to the IN3, where V
LDO driver feedback regulation voltage, is 1.25V.
Choose R
calculate R
The output voltage of negative LDO driver is set by a
resistive divider from the output (V
the center tap connected to IN2, where V
negative LDO driver feedback regulation voltage, is
0.25V. Choose R
R
51k and calculate R
R
AAT1164/AAT1164B/AAT1164C
5
8
=
=
R
R
-135
-180
-225
-270
-20
-40
-90
60
40
20
0
6
9






–
Simulation
6
V
V
5
V
V
(Figure 8) between 10k
IN2
OUT3
with the following equation.
REF
IN3
10
2
−
−
9
V
−
(Figure 9) between 10k and
V
OUT2
1
IN2



10
8
3
with the following equation.



Frequency (Hz)
Bode Diagram
10
4
OUT3
OUT2
10
5
) to GND with the
and 51k . And
) to VREF with
IN3
, the positive
10
6
April 2007
IN2,
®
the