AAT1415-Q8-T AAT [Advanced Analog Technology, Inc.], AAT1415-Q8-T Datasheet - Page 30

• Manufacturer Part Number: AAT1415-Q8-T
• Description: FIVE-CHANNEL DC-DC CONVERTER WITH A 2.5V LDO
• Manufacturer: AAT [Advanced Analog Technology, Inc.]

Boost Controller Compensation
The boost controller employs voltage-mode control to
regulate their output voltage. A benefit of discontinuous
conduction mode (DCM) is more flexible loop
compensation, better response ability and no maximum
duty-cycle restriction on boost ratio. When the boost
converter operates with discontinuous conduction
mode (typically the CCD VH case), the boost controller
has a single pole at the following:
Set the loop cross over frequency (
of 1/10 the switching frequency (
compensation
crossover frequency
following equation:
Where:
The
so:
C
R
C
C
C
M
f
P
C
C
OUT
U
C
=
=
=
=
=
=
2
2
R C
R
0.325A
2
250mA 0.5V / A
2 (
π ×
⋅
=
C C
L
π ×
LOAD
⋅
250mA
V
⋅
R
V
f
1.5V
OUT
SW
20k
LOAD
OUT
1.25V
2 V
zero is then used to cancel the
×
×
×
Ω ×
⋅
0.03 1.25 70µ A / V
−
V
OUT
×
capacitor
×
I
V
70kHz (
C
68k
I
)
OUT
×
×
−
1
Ω ×
0.5V / A
f . Determine the value by the
2
V
C
G
⋅ π
I
×
×
×
m
2.2nF
V
2
f
×
70µ A / V
1.25V
C
OUT
π ⋅
C
×
C
70kHz
≈
Advanced Analog Technology, Inc.
M
to
1.5V
22µF
⋅
(
f ) below the lower
f
V
C
SW
V
set
≈
OUT
)
≈
OUT
2.2nF
≈
,
68k
). Choose the
–
220pF
−
the
Ω
V
–
Advanced Analog Technology, Inc . –
,
I
,
)
台 灣 類 比 科 技 股 份 有 限 公 司
f
P
desired
.
pole,
Page 30 of 32
Version 3.00
The typical R
If the system wants better transient response, it can
parallel a capacitor
If
omitted. Additionally,
current
So, for a 13V/30mA output with V
Inverting Controller Compensation
The inverting controller also employs voltage-mode
control to regulate their output voltage. To operate in
discontinuous conduction mode (DCM) is preferred for
simple loop compensation and freedom from duty-cycle
restrictions on the inverter input-output ratio. When the
Inverting
conduction mode (typically the CCD VL case), the
inverting controller has a single pole at the following:
R
C
R
C
R
C
V
f
P
OUT _
U
UPPER
C
U
C
C
C
=
=
=
≈
=
=
=
U
⋅ π
4.7nF
2
(2 13V 3V) 2
(2 13V 3V) 4.7nF
2
V
is calculated to be less than 10pF, it can be
2 (
π ×
13V 433
π ×
:
R
OUT
13V 3V
⋅
⋅
= 100 kΩ ,
LOAD
–
⋅
100k 50kHz
R
V
converter
⋅
UPPER _
⋅
OUT
1
R
C
⋅
−
−
LOAD
is under 500 kΩ .
⋅
×
C
−
Ω ⋅
OUT
V
10µF
⋅
AAT1415/AAT1415A
I
×
f
⋅
×
)
SW
C
1
⋅
C
f
70µ A / V
C
C
1
OUT
π ⋅
C
U
operates
×
C
= 500kHz:
× 
U
50kHz
(


with
1.25V
V
≈
can suppress the inrush
IN _
500k
R
V
×
13V
UPPER _
OUT _
Ω
I
with
= 3.0V, L = 3.5 µH ,
8m (13V 2V)
,
)
≈
⋅



330pF
13V
discontinuous
from IN_ to
−
May 2008
.