AAT1164-Q5-T AAT [Advanced Analog Technology, Inc.], AAT1164-Q5-T Datasheet - Page 17

• Manufacturer Part Number: AAT1164-Q5-T
• Description: TRIPLE-CHANNEL TFT LCD POWER SOLUTION
• Manufacturer: AAT [Advanced Analog Technology, Inc.]

ESR: Equivalent Series Resistance
Example 2:
Boost Converter Power loss
The largest portions of power loss in the boost
converter are the internal power MOSFET, the inductor,
the Schottky diode, and the output capacitor. If the
boost
approximately 7.89% power loss in the internal
MOSFET, 1.34% power loss in the inductor, 0.68%
power loss in the Schottky diode, and 0.08% power loss
in the output capacitor.
Loop Compensation Design
The voltage-loop gain with current loop closed sets the
stability of
performance
compensation design is as follows:
V
V
V
I
P
I
P
V
V
C(rms)
C(rms)
RIPPLE
ESR
RIPPLE
RIPPLE
ESR
RIPPLE
RIPPLE
= 0.00338W or 0.08% power loss
=
= 0.411A
=
(C
converter
(ESR) I
(
(C
(ESR)
= 25.6mV
I
V
R
C(rms)
OUT
OUT
O
L
C
OUT
steady state response and dynamic
1 D 12
) = 4.1mV
)
≈
= 21.5mV
of
−
D
)
≈
2
L(peak) C
= 38µF,
r
f C
C
S OUT
+
has
transient
I D
O
Advanced Analog Technology, Inc.
D
r
[
(1 D)R
90%
r
−
Lf
C
S
= 20 m
L
response.
]
efficiency,
2
–
The
–
Advanced Analog Technology, Inc . –
there
台 灣 類 比 科 技 股 份 有 限 公 司
loop
Page 17 of 24
Version 1.00
is
Figure 5. Block Diagram of Boost Converter with
Power Stage Transfer Functions
The duty to output voltage transfer function T
Where
And
ω
T (s)
AAT1164/AAT1164B/AAT1164C
Figure 4. Closed-Current Loop for Boost with PCM
p
z2
−
+
=
=
R 1 D
T
V
p0
L
d
–
O
(
Peak Current Mode (PCM)
=
=
−
L
V
T
O
p0
)
2
(
1 D R
(s ω
−
s
−
2
r
+
,
+
) (
ω
−
2 ξω s ω
esr
r
n
C
L
=
)(s ω )
n
+
r
C
LC
−
+
(
)
1 D R
OUT
,
−
z2
n
β
ω
2
esr
)
(
2
R
=
L
L
C
+
OUT C
+
+
+
r
−
C
1
r
)
p
r
April 2007
is :
−
β