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參數(shù)資料
| 型號： | MIC2570-1BM |
| 廠商： | MICREL INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Two-Cell Switching Regulator Preliminary Information |
| 中文描述： | 1 A SWITCHING REGULATOR, 20 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁數(shù)： | 8/14頁 |
| 文件大?。?/td> | 178K |
| 代理商： | MIC2570-1BM |
1997
4-69
MIC2570
Micrel
4
at each cycle. At the threshold between continuous and
discontinuous operation we can use the fact that I
1
= I
2
to get:
V
t = V
t
1
2
×
×
V
V
= t
t
1
2
2
1
This relationship is useful for finding the desired oscillator
duty cycle based on input and output voltages. Since input
voltages typically vary widely over the life of the battery, care
must be taken to consider the worst case voltage for each
parameter. For example, the worst case for t
1
is when V
IN
is
at its minimum value and the worst case for t
2
is when V
IN
is
at its maximum value (assuming that V
OUT
, V
DIODE
and V
SAT
do not change much).
To select an inductor for a particular application, the worst
case input and output conditions must be determined. Based
on the worst case output current we can estimate efficiency
and therefore the required input current. Remember that this
is power conversion, so the worst case average input current
will occur at maximum output current and minimum input
voltage.
Average I
=
V
I
V
Efficiency
IN(max)
OUT
OUT(max)
IN(min)
×
×
Referring to Figure 1, it can be seen the peak input current will
be twice the average input current. Rearranging the inductor
equation to solve for L:
L = V
I
t
1
×
L =
V
2
Average I
t
IN(min)
IN(max)
1
×
×
where t = duty cycle
f
OSC
To illustrate the use of these equations a design example will
be given:
Assume:
MIC2570-1 (fixed oscillator)
V
OUT
= 5V
I
OUT(max)
=50mA
V
IN(min)
= 1.8V
efficiency = 75%.
Average I
= 5V
50mA
0.75 = 185.2mA
×
1.8V
IN(max)
×
L =
1.8V
185.2mA
0.7
×
2
20kHz
×
×
L = 170
μ
H
Use the next lowest standard value of inductor and verify that
it does not saturate at a current below about 400mA
(< 2
×
185.2mA).
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相關代理商/技術參數(shù) |
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|---|---|
| MIC2570-1BM TR | 功能描述:IC REG BOOST 2.85V/3.3V/5V 8SOIC 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 |
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| MIC2570-1YM TR | 功能描述:直流/直流開關調節(jié)器 Two Cell Boost Regulator (Lead Free) RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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| MIC2570-2BM TR | 功能描述:IC REG BOOST ADJ 1A 8SOIC 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 |
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