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參數(shù)資料
| 型號(hào)： | 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(yè)數(shù)： | 12/13頁(yè) |
| 文件大小： | 169K |
| 代理商： | MIC5190 |
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M
IC
5
1
9
0
Micrel
April, 2
00
4
1
2
M9999-
0
428
0
4
U
sing the M
IC
5
1
9
0
as a filter for a switching regulator
reduces output noise due to ripple and high frequency switch-
ing noise.
I
t also reduces undershoot (Figure
1
2) and over-
shoot (Figure
13
) due to load transients with decreased
capacitance.
Figure 13. Transient Response
D
ue to the high
DC
gain (8
0
dB) of the M
IC
5
1
9
0
, it also adds
increased output accuracy and extremely high load regula-
tion.
Distributed Power Supply
As technology advances and processes move to smaller and
smaller geometries, voltage requirements go down and cur-
rent requirements go up.
T
his creates unique challenges
when trying to supply power to multiple devices on a board.
When there is one load to power, the difficulties are not quite
as complex; trying to distribute power to multiple loads from
one supply is much more problematic.
I
f a large circuit board has multiple small-geometry A
SIC
s, it
will require the powering of multiple loads with its one power
source. Assuming that the A
SIC
s are dispersed throughout
the board and that the core voltage requires a regulated
1V
,
Figure
1
4 shows the long traces from the power supply to the
A
SIC
loads.
N
ot only do we have to contend with the toler-
ance of the supply (line regulation, load regulation, output
accuracy, and temperature tolerances), but the trace lengths
create additional issues with resistance and inductance. With
lower voltages these parasitic values can easily bump the
output voltage out of a usable tolerance.
Load
Load
S
witching
P
ower
S
upply
Circuit Board
Load
Load
Long
T
races
Figure 14. Board Layout
But by placing multiple small M
IC
5
1
9
0
circuits close to each
load, the parasitic trace elements caused by distance to the
power supply are almost completely negated. By adjusting
the switching supply voltage to
1
.2
V
, for our example, the
M
IC
5
1
9
0
will provide accurate
1V
output, efficiently and with
very little noise.
Figure 15. Improved Distributed Supplies
Load
Load
S
witching
P
ower
S
upply
Circuit Board
Load
Load
M
IC
5
1
9
0
M
IC
5
1
9
0
M
IC
5
1
9
0
M
IC
5
1
9
0
TI
ME (
100
μ
s/div)
I
(
1
m
V
/
O
O
A
D
C
E
N
(
1
m
V
/
(
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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(qū)動(dòng)器 系列:- 產(chǎn)品培訓(xùn)模塊:More Information on LDOs 標(biāo)準(zhǔn)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(yīng)商設(shè)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(qū)動(dòng)器 系列:- 產(chǎn)品培訓(xùn)模塊:More Information on LDOs 標(biāo)準(zhǔn)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(yīng)商設(shè)備封裝:16-SOIC 包裝:帶卷 (TR) |
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