參數(shù)資料
型號： MIC2141
廠商： Micrel Semiconductor,Inc.
英文描述： Micropower Boost Converter Preliminary Information
中文描述： 微功率升壓轉(zhuǎn)換器的初步信息
文件頁數(shù)： 8/16頁
文件大小： 154K
代理商： MIC2141
MIC2141
Micrel
MIC2141
8
June 2000
Output Capacitor
If the availability of tantalum capacitors is limited, ceramic
capacitors and inexpensive electrolyics may be necessary.
Selection of the capacitor value will depend upon on the peak
inductor current and inductor size. MuRata offers the GRM
series with up to 10
μ
F at 25V, with a Y5V temperature
coefficient, in a 1210 surface-mount package. Low-cost
applications can use M-series leaded electrolytic capacitors
from Panasonic. In general, ceramic, electrolytic, or tantalum
values ranging from 10
μ
F to 47
μ
F can be used for the output
capacitor.
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Table 4. Capacitor Examples
Design Example
Given a design requirement of 12V output and 1mA load with
a minimum input voltage of 2.5V, Equation 1 can be used to
calculate to maximum inductance or it can be read from the
graph in Figure 4. Once the maximum inductance has been
determined, the peak current can be determined using Equa-
tion 2 or Figure 10.
V
OUT
= 12V
I
OUT
= 1mA
V
IN
= 4.8V to 2.5V
SW
FB
GND
IN
VC
1
5
3
2
4
MIC2141
C4
0.1
μ
F
C1
10
μ
F
25V
CR1
BAT54HT1
L1
33
μ
H
C2
10
μ
F
25V
V
+5V to +15V
Return
V
IN
+2.7V to +12V
V
C
Return
Figure 1. Basic Configuration
SW
FB
GND
IN
VC
4
5
3
1
2
MIC2141
C4
0.1
μ
F
R1
34.8k
I
FB
R2
121k
C1
10
μ
F
25V
CR1
BAT54HT1
L1
22
μ
H
C2
10
μ
F
25V
V
+5V to +20V
Return
V
IN
+2.7V to +12V
V
C
Return
V
6V
1
R1
R2
I
R1
I
15 A for V
15V
OUT
C
FB
=
FB(typ)
OUT
=
+
=
Figure 2. Gain-Boost Configuration
SW
FB
GND
IN
VC
1
5
3
2
4
MIC2141
C4
0.1
μ
F
C1
10
μ
F
25V
CR1
MBR0530
CR3
1N4148
CR2
1N4148
C2
10
μ
F
25V
L1
4.7
μ
H
V
+12V
Return
V
IN
+2.7V to +4.7V
V
C
Return
Figure 3. Bootstrap Configuration
L
V
t
I
V
eff
V
2
L
17 H
MAX
IN(min)
ON(min)
O(max)
O
IN(min)
MAX
=
=
2
2
T
S(min)
Select 15
μ
H
±
10%.
I
t
V
L
0.767 s
4.8V
13.5 H
I
272mA
PEAK
ON(max)
IN(max)
MIN
PEAK
=
=
=
Select a BAT54 diode and CR32 inductor.
Always check the peak current to insure that it is within the
limits specified in the load line shown in Figure 10 for all
input and output voltages.
Gain Boost
Use Figure 2 to increase the voltage gain of the system. The
typical gain can easily be increased from the nominal gain of
6 to a value of 8 or 10. Figure 2 shows a gain of 8 so that with
2.5V applied to VC, V
OUT
will be 20V.
Bootstrap
The bootstrap configuration is used to increase the maximum
output current for a given input voltage. This is most effective
when the input voltage is less than 5V. Output current can
typically be tripled by using this technique. See Table 4a. for
bootstrap-ready-built component values.
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相關代理商/技術參數(shù)
參數(shù)描述
MIC2141_06 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:Micropower Boost Converter
MIC2141BM5 制造商:Rochester Electronics LLC 功能描述:- Bulk
MIC2141-BM5 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:Micropower Boost Converter Preliminary Information
MIC2141BM5 TR 功能描述:IC REG BOOST ADJ 10MA SOT23-5 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 標準包裝:20 系列:SIMPLE SWITCHER® 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:12V 輸入電壓:4 V ~ 60 V PWM 型:電壓模式 頻率 - 開關:52kHz 電流 - 輸出:1A 同步整流器:無 工作溫度:-40°C ~ 125°C 安裝類型:通孔 封裝/外殼:16-DIP（0.300"，7.62mm） 包裝:管件 供應商設備封裝:16-DIP 其它名稱:*LM2575HVN-12LM2575HVN-12
MIC2141YM5 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:Micropower Boost Converter
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