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| 型號(hào)： | MIC5191BMM |
| 廠商： | MICREL INC |
| 元件分類： | 模擬信號(hào)調(diào)理 |
| 英文描述： | Ultra High-Speed, High-Current Active Filter/LDO Controller |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO10 |
| 封裝： | MSOP-10 |
| 文件頁(yè)數(shù)： | 8/13頁(yè) |
| 文件大?。?/td> | 182K |
| 代理商： | MIC5191BMM |
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MIC51
9
1
M
icrel
A
pril
200
4
8
M
9999-
0
4
2
8
0
4
T
his
places
a
pole
at
2.3k
Hz
at
8
0
d
B
and
calculates
as
follows
.
F
M
p
F
F
k
Hz
P
P
=
×
×
=
1
2
2 32
3
4
2
.
20
π
-
20
0
20
4
0
60
8
0
100
0.01
0.1
1
10
100
1000
10000 100000
Frequency (KHz)
G
-4
5
0
4
5
9
0
135
1
8
0
225
P
Figure 4. Internal Compensation
Frequency Response
T
here
is
single
pole
roll
off
. F
or
most
applications,
an
output
capacitor
is
required
. T
he
output
capacitor
and
load
resis-
tance
create
another
pole
. T
his
causes
a
two-pole
system
and
can
potentially
cause
design
instability
with
inadequate
phase
margin
.
What
should
we
do
A
nswer:
we
compensate
it
externally
. B
y
providing
a
dominant
pole
and
zero–allowing
the
output
capacitor
and
load
to
provide
the
final
pole–a
net
single
pole
roll
off
is
created,
with
the
zero
canceling
the
dominant
pole
. F
igure
5
demonstrates:
E
rror
A
mplifier
D
river
3.
4
2M
20
p
F
I
nternal
E
xternal
C
omp
R
COMP
C
COMP
Figure 5. External Compensation
P
lacing
an
external
capacitor
(
C
COMP
)
and
resistor
(
R
COMP
)
for
the
external
pole-zero
combination
.
Where
the
dominant
pole
can
be
calculated
as
follows:
F
M
C
P
COMP
=
×
×
1
2
3
4
2
.
π
A
nd
the
zero
can
be
calculated
as
follows:
F
R
C
Z
COMP
COMP
=
×
×
1
2
π
T
his
allows
for
high
DC
gain,
and
high
bandwidth
with
the
output
capacitor
and
the
load
providing
the
final
pole
.
Figure 6. External Compensation
Frequency Response
I
t
is
recommended
that
the
gain
bandwidth
should
be
de-
signed
to
be
less
than
1 M
Hz
. T
his
is
because
most
capaci-
tors
lose
capacitance
at
high
frequency
and
becoming
resis-
tive
or
inductive
. T
his
can
be
difficult
to
compensate
for
and
can
create
high
frequency
ringing
or
worse,
oscillations
.
B
y
increasing
the
amount
of
output
capacitance,
transient
response
can
be
improved
in
multiple
ways
. F
irst,
the
rate
of
voltage
drop
vs
.
time
is
decreased
. A
lso,
by
increasing
the
output
capacitor,
the
pole
formed
by
the
load
and
the
output
capacitor
decreases
in
frequency
. T
his
allows
for
the
increas-
ing
of
the
compensation
resistor,
creating
a
higher
mid-band
gain
.
Figure 7. Increasing Output Capacitance
T
his
will
have
the
effect
of
both
decreasing
the
voltage
drop
as
well
as
returning
closer
and
faster
to
the
regulated
voltage
during
the
recovery
time
.
MOSFET Selection
T
he
typical
pass
element
for
the
MIC51
9
1
is
an
N
-
C
hannel
MOSFET. T
here
are
multiple
considerations
when
choosing
a
MOSFET. T
hese
include:
V
IN
to
V
OUT
differential
O
utput
C
urrent
C
ase
S
ize/
T
hermal
C
haracteristics
G
ate
C
apacitance
(
C
ISS
<
10
n
F
)
G
ate
to
S
ource
threshold
-
20
0
20
4
0
60
8
0
100
0.01
0.1
1
10
100
1000
10000 100000
Frequency (KHz)
G
-4
5
0
4
5
9
0
135
1
8
0
225
P
T
he
D
ominant
P
ole
E
xternal
Zero
R
LOAD
×
C
OUT
P
ole
Ccomp
M
Fp
×
×
=
42
.
2
1
Ccomp
Rcomp
Fz
×
×
=
2
1
-
20
0
20
4
0
60
8
0
100
0.01
0.1
1
10
100
1000
10000 100000
Frequency (KHz)
G
-4
5
0
4
5
9
0
135
1
8
0
225
P
I
ncreasing
C
reduces
the
load
resistance
and
output
capacitor
pole
allowing
for
an
increase
in
mid-band
gain
.
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