- 您现在的位置：买卖IC网 > PDF目录14203 > MIC2571-2YMM TR (Micrel Inc)IC REG BOOST ADJ 1A 8MSOP PDF资料下载
参数资料
| 型号： | MIC2571-2YMM TR |
| 厂商： | Micrel Inc |
| 文件页数： | 8/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 1A 8MSOP |
| 标准包装： | 2,500 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.9 V ~ 36 V |
| 输入电压： | 0.9 V ~ 15 V |
| 频率 - 开关： | 20kHz |
| 电流 - 输出： | 1A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-MSOP |
| 其它名称： | MIC2571-2YMMTR MIC2571-2YMMTR-ND |
MIC2571
When the output switch turns off, the voltage across the
inductor changes sign and flies high in an attempt to maintain
a constant current. The inductor voltage will eventually be
Micrel
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:
clamped to a diode drop above V OUT . Therefore, when the
output switch is off, the voltage across the inductor is:
L =
V
I
× t 1
V 2 = V OUT DIODE – V IN
+ V
For normal operation the inductor current is a triangular
waveform which returns to zero current (discontinuous mode)
L =
V IN(min)
2 × Average I IN(max)
× t 1
at each cycle. At the threshold between continuous and
discontinuous operation we can use the fact that I 1 = I 2 to get:
V 1 × t 1 = V 2 × t 2
where t 1 =
duty cycle
f OSC
V 1
V 2
=
t 2
t 1
To illustrate the use of these equations a design example will
be given:
Assume:
This relationship is useful for finding the desired oscillator
MIC2571-1 (fixed oscillator)
1.0V × 0.75
1.0V × 0.7
2 × 33.3mA × 20kHz
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
V OUT = 5V
I OUT(max) =5mA
V IN(min) = 1.0V
efficiency = 75%.
Average I IN(max) =
L =
5V × 5mA
= 33.3mA
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.
L = 525 μ H
Use the next lowest standard value of inductor and verify that
it does not saturate at a current below about 75mA
(< 2 × 33.3mA).
Average I IN(max) =
V OUT × I OUT(max)
V IN(min) × Efficiency
MIC2571
8
1997
相关PDF资料 |
PDF描述 |
|---|---|
| MIC2571-1YMM TR | IC REG BOOST 2.85V/3.3V/5V 8MSOP |
| VE-B1F-EW-F4 | CONVERTER MOD DC/DC 72V 100W |
| LM2575WT | IC REG BUCK ADJ 1A TO220-5 |
| VE-B1D-EX-F2 | CONVERTER MOD DC/DC 85V 75W |
| LM2575-3.3WT | IC REG BUCK 3.3V 1A TO220-5 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC2580-1.0BTS | 制造商:Micrel Inc 功能描述:Hot Swap Controller 24-Pin TSSOP 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MIC2580-1.0BTSTR | 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel |
| MIC2580-1.6BTS | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MIC2580A-1.0BTS | 功能描述:IC CTRLR HOTSWAP PCI PWR 24TSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:100 系列:- 类型:热插拔开关 应用:通用 内部开关:是 电流限制:可调 电源电压:9 V ~ 13.2 V 工作温度:-40°C ~ 150°C 安装类型:表面贴装 封装/外壳:10-WFDFN 裸露焊盘 供应商设备封装:10-TDFN-EP（3x3） 包装:管件 |
| MIC2580A-1.0BTS TR | 功能描述:IC CTRLR PCI HOT SWAP 24-TSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:100 系列:- 类型:热插拔开关 应用:通用 内部开关:是 电流限制:可调 电源电压:9 V ~ 13.2 V 工作温度:-40°C ~ 150°C 安装类型:表面贴装 封装/外壳:10-WFDFN 裸露焊盘 供应商设备封装:10-TDFN-EP（3x3） 包装:管件 |
发布紧急采购，3分钟左右您将得到回复。