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參數(shù)資料
| 型號： | MIC5190 |
| 廠商： | Micrel Semiconductor,Inc. |
| 英文描述： | ECONOLINE: RY & RX - Controllable Output- 1kVDC Isolation- No Heatsink Required- UL94V-0 Package Material- Toroidal Magnetics- No External Components- Fully Encapsulated- Efficiency to 70% |
| 中文描述： | 超高速，高電流有源濾波器/ LDO控制器 |
| 文件頁數(shù)： | 11/13頁 |
| 文件大?。?/td> | 169K |
| 代理商： | MIC5190 |
April, 2
00
4
11
M9999-
0
428
0
4
M
IC
5
1
9
0
Micrel
Feedback Resistors
IR3716S
R1
COUT
R
2
FB
GND
MIC5190
V
OUT
Figure 10. Adjustable Output
T
he feedback resistors adjust the output to the desired
voltage and can be calculated as follows:
V
V
R1
R
2
OUT
R
EF
=
+
1
V
R
EF
is equal to
0
.5
V
for the M
IC
5
1
9
0
.
T
he minimum output
voltage (
R1
=
0
) is
0
.5
V
. For output voltages greater than
1V
,
use the M
IC
5
1
9
1
.
T
he resistor tolerance adds error to the output voltage.
T
hese
errors are accumulative for both
R1
and
R
2. For example, our
resistors selected have a
±
1
% tolerance.
T
his will contribute
to a
±
2% additional error on the output voltage.
T
he feedback resistors must also be small enough to allow
enough current to the feedback node. Large feedback resis-
tors will contribute to output voltage error.
V
V
V
R1 I
1
k
m
V
1
2
1
A
E
RROR
FB
×
E
RROR
E
RROR
=
=
=
μ
2
For our example application, this will cause an increase in
output voltage of
1
2m
V
. For the percentage increase,
V
V
V
V
1
2m
V
1
.5
V
. %
0
8
V
E
RROR
E
RROR
OUT
E
RROR
E
RROR
%
%
%
=
×
=
×
=
100
100
By reducing
R1
to
100
, the error contribution by the feed-
back resistors and feedback current is reduced to less than
0
.
1
%.
T
his is the reason
R1
should not be greater than
100
.
Applying the MIC5190
Linear Regulator
T
he primary purpose of the M
IC
5
1
9
0
is as a linear regulator,
which enables an input supply voltage to drop down through
the resistance of the pass element to a regulated output
voltage.
Active Filter
Another application for the M
IC
5
1
9
0
is as an active filter on
the output of a switching regulator.
T
his improves the power
supply in several ways.
First, using the M
IC
5
1
9
0
as a filter on the output can signifi-
cantly reduce high frequency noise.
S
witching power sup-
plies tends to create noise at the switching frequency in the
form of a triangular voltage ripple. High frequency noise is
also created by the high-speed switching transitions. A lot of
time, effort , and money are thrown into the design of
switching regulators to minimize these effects as much as
possible. Figure 9 shows the M
IC
5
1
9
0
as a post regulator.
Figure 11. Ripple Reduction
Figure
11
shows the amount of ripple reduction for a 5
00
kHz
switching regulator.
T
he fundamental switching frequency is
reduced from greater than
100
m
V
to less than
10
m
V
.
Figure 12. 10A Load Transient
T
he transient response also contributes to the overall A
C
output voltage deviation. Figure
1
2 shows a
1
A to
10
A load
transient.
T
he top trace is the output of the switching regulator
(same circuit as Figure
10
).
T
he output voltage undershoots
by
100
m
V
. Just by their topology, linear regulators have the
ability to respond at much higher speeds than a switching
regulator. Linear regulators do not have the limitation or
restrictions of switching regulators which must reduce their
bandwidth to less than their switching frequency.
TI
ME (
100
μ
s/div)
O
(
1
m
V
/
L
O
A
D
C
E
N
(
I
(
1
m
V
/
TI
ME (
1
μ
s/div)
I
R
L
(
1
m
V
/
O
(
1
m
V
/
V
OUT
=
1V
I
L
O
A
D
=
10
A
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| MIC5190BML TR | 功能描述:IC REG CTRLR SGL POS ADJ 10-MLF RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性晶體管驅動器 系列:- 產品培訓模塊:More Information on LDOs 標準包裝:2,500 系列:- 類型:正，固定式 輸出數(shù):2 輸出電壓:2.8V，3.3V 電流 - 電源:12mA 輸入電壓:5 V ~ 22 V 工作溫度:0°C ~ 70°C 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:16-SOIC 包裝:帶卷 (TR) |
| MIC5190BMM | 功能描述:IC REG CTRLR SGL POS ADJ 10MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性晶體管驅動器 系列:- 產品培訓模塊:More Information on LDOs 標準包裝:2,500 系列:- 類型:正，固定式 輸出數(shù):2 輸出電壓:2.8V，3.3V 電流 - 電源:12mA 輸入電壓:5 V ~ 22 V 工作溫度:0°C ~ 70°C 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:16-SOIC 包裝:帶卷 (TR) |
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