參數(shù)資料
型號： MAX15003
廠商： Maxim Integrated Products, Inc.
英文描述： Triple-Output Buck Controller with Tracking/Sequencing
中文描述： 三輸出buck控制器，提供跟蹤/排序功能
文件頁數(shù)： 23/32頁
文件大?。?/td> 945K
代理商： MAX15003
M
Triple-Output Buck Controller with
Tracking/Sequencing
______________________________________________________________________________________
23
Type II: Compensation When f
CO
> f
ZERO, ESR
When the f
ZERO,ESR
is lower than f
CO
and close to f
LC
,
a Type II compensation network provides the neces-
sary closed-loop response. The Type II compensation
network provides a mid-band compensating zero and
high-frequency pole (see Figures 6a and 6b).
R
F
C
F
provides the mid-band zero f
MID,ZERO
, and
R
F
C
CF
provides the high-frequency pole. Use the fol-
lowing procedure to calculate the compensation net-
work components.
1) Calculate the f
ZERO,ESR
and LC double pole, f
LC
:
2) Calculate the unity-gain crossover frequency as:
3) Determine R
F
from the following:
Note:
R
F
is derived by setting the total loop gain at
crossover frequency to unity, e.g., G
EA
(f
CO
) x G
M
(f
CO
)
= 1V/V. The transconductance error amplifier gain is
G
EA
(f
CO
) = g
M
x R
F
while the modulator gain is:
The total loop gain can be expressed logarithmically as
follows:
where V
RAMP
is the peak-to-peak ramp amplitude
equal to 2V.
4) Place a zero at or below the LC double pole, f
LC
:
5) Place a high-frequency pole at or below f
P
= 0.5 x
f
SW
:
6) Choose an appropriately sized R1 (connected from
OUT_ to FB_, start with a 10k
). Once R1 is select-
ed, calculate R2 using the following equation:
where V
FB
= 0.6V.
R
R
VFB
VOUTVFB
2
1
=
×
C
CF
RF fSW
×
=
×
1
π
C
F
RF fLC
×
=
×
1
2
π
2
2
2
0
0log10gmRF+
0log10
×
)
×
×
×
(
×
=
ESR VINVFB
fCOL
VOUT VRAMP
dB
π
G
MOD CO
VIN
VRAMP
ESR
fCOL
×
VFB
VOUT
)
=
×
×
×
2
π
R
F
VRAMP
VFBVINgmESR
×
fCOL VOUT
×
×
×
=
×
(
2
π
f
CO
fSW
10
≤
f
f
ZEROESR
ESR COUT
1
LC
L COUT
×
,
=
=
1
2
2
π
π
×
×
×
R
1
R
F
COMP
V
OUT
V
REF
C
CF
C
F
R
2
-
+
g
M
Figure 6a. Type II Compensation Network
GAIN
(dB)
1ST ASYMPTOTE
G
MOD
V
REF
V
OUT-1
(
ω
C
F
)
-1
ω
(rad/s)
3RD ASYMPTOTE
G
MOD
V
REF
V
OUT-1
(
ω
C
CF
)
-1
2ND ASYMPTOTE
G
MOD
V
REF
V
OUT-1
R
F
1ST POLE
(AT ORIGIN)
2ND POLE
(R
F
C
CF
)
-1
1ST ZERO
(R
F
C
F
)
-1
Figure 6b. Type II Compensation Network Response
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