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參數資料
| 型號： | MIC5191BMM TR |
| 廠商： | Micrel Inc |
| 文件頁數： | 12/15頁 |
| 文件大?。?/td> | 845K |
| 描述： | IC REG CTRLR SGL POS ADJ 10-MSOP |
| 標準包裝： | 2,500 |
| 類型： | 正，可調式 |
| 輸出數： | 1 |
| 輸出電壓： | 可調 |
| 電流 - 電源： | 15mA |
| 輸入電壓： | 1 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 125°C |
| 封裝/外殼： | 10-TFSOP，10-MSOP（0.118"，3.00mm 寬） |
| 供應商設備封裝： | 10-MSOP |
| 包裝： | 帶卷 (TR) |
| 其它名稱： | MIC5191BMMTR MIC5191BMMTR-ND |
Micrel, Inc.
MIC5191
December 2006
12
M9999-122206
Feedback Resistors
IR3716S
R1
COUT
R2
FB
GND
MIC5191
V
OUT
Figure 10. Adjustable Output
The feedback resistors adjust the output to the desired
voltage and can be calculated as follows:
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
+
=
R2
R1
1
V
V
REF
OUT
V
REF
is equal to 1.0V for the MIC5191. The minimum
output voltage (R1=0) is 0.5V. For output voltages less
than 1V, use the MIC5190.The resistor tolerance adds
error to the output voltage. These errors are
accumulative for both R1 and R2. For example, our
resistors selected have a ?% tolerance. This will
contribute to a ?% additional error on the output
voltage. The feedback resistors must also be small
enough to allow enough current to the feedback node.
Large feedback resistors will contribute to output voltage
error.
V
ERROR
= R1 x 1
FB
V
ERROR
= 1k& x 12礎
V
ERROR
= 12mV
For our example application, this will cause an increase
in output voltage of 12mV. For the percentage increase,
100
V
V
%
V
OUT
ERROR
ERROR
?/DIV>
=
100
1.5V
12mV
%
V
ERROR
?/DIV>
=
V
ERROR
% = 0.8%
By reducing R1 to 100&, the error contribution by the
feed-back resistors and feedback current is reduced to
less than 0.1%. This is the reason R1 should not be
greater than 100&.
Applying the MIC5191
Linear Regulator
The primary purpose of the MIC5191 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 MIC5191 is as an active filter
on the output of a switching regulator. This improves the
power supply in several ways.
First, using the MIC5191 as a filter on the output can
significantly reduce high frequency noise. Switching
power supplies 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 MIC5191 as a post regulator.
Figure 11. Ripple Reduction
Figure 11 shows the amount of ripple reduction for a 500
KHz switching regulator. The fundamental switching
frequency is reduced from greater than 100mV to less
than 10mV.
Figure 12. 10A Load Transient
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相關代理商/技術參數 |
參數描述 |
|---|---|
| MIC5191YML | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:Ultra High-Speed, High-Current Active Filter / LDO Controller |
| MIC5191YML TR | 功能描述:低壓差控制器 - LDO Ultra Hi-Speed Hi-Current Active Filter/LDO Controller(Lead Free) RoHS:否 制造商:Micrel 最大輸入電壓:5.5 V 輸出電壓:Adjustable 輸出電流:10 mA 負載調節(jié): 輸出類型:Adjustable, Fixed 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SOT-23-6 |
| MIC5191YML-TR | 功能描述:Linear Regulator Controller IC Positive Adjustable 1 Output 10-MLF? (3x3) 制造商:microchip technology 系列:- 包裝:* 零件狀態(tài):停產 類型:正，可調式 輸出數:1 電流 - 電源:15mA 電壓 - 輸入:1 V ~ 5.5 V 工作溫度:-40°C ~ 125°C 封裝/外殼:10-VFDFN 裸露焊盤，10-MLF? 供應商器件封裝:10-MLF?（3x3） 標準包裝:1 |
| MIC5191YMM | 功能描述:低壓差控制器 - LDO Ultra Hi-Speed Hi-Current Active Filter/LDO Controller(Lead Free) RoHS:否 制造商:Micrel 最大輸入電壓:5.5 V 輸出電壓:Adjustable 輸出電流:10 mA 負載調節(jié): 輸出類型:Adjustable, Fixed 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SOT-23-6 |
| MIC5191YMM TR | 功能描述:低壓差控制器 - LDO Ultra Hi-Speed Hi-Current Active Filter/LDO Controller(Lead Free) RoHS:否 制造商:Micrel 最大輸入電壓:5.5 V 輸出電壓:Adjustable 輸出電流:10 mA 負載調節(jié): 輸出類型:Adjustable, Fixed 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SOT-23-6 |
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