参数资料
型号: MIC2570-2BM
厂商: Micrel Inc
文件页数: 8/15页
文件大小: 0K
描述: IC REG BOOST ADJ 1A 8SOIC
标准包装: 95
类型: 升压(升压)
输出类型: 可调式
输出数: 1
输出电压: 1.3 V ~ 36 V
输入电压: 1.3 V ~ 15 V
频率 - 开关: 20kHz
电流 - 输出: 1A
同步整流器:
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 8-SOIC(0.154",3.90mm 宽)
包装: 管件
供应商设备封装: 8-SOIC
MIC2570
Micrel, Inc.
V 1 t 2
V 2
t 1
× t 1
at each cycle. At the threshold between continuous and dis-
continuous operation we can use the fact that I 1 = I 2 to get:
V 1 × t 1 = V 2 × t 2
=
L=
L=
V
I
V IN(min)
2 × Average I IN(max)
× t 1
Average I IN(max) =
where t 1 =
Average I IN(max) =
× 185.2mA
L=
This relationship is useful for ?nding 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 ef?ciency
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.
V OUT × I OUT(max)
V IN(min) × Efficiency
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:
duty cycle
f OSC
To illustrate the use of these equations a design example
will be given:
Assume:
MIC2570-1 (?xed oscillator)
V OUT = 5V
I OUT(max) =50mA
V IN(min) = 1.8V
ef?ciency = 75%.
5V × 50mA
1.8V × 0.75
1.8V × 0.7
2 × 185.2mA × 20kHz
L = 170μH
Use the next lowest standard value of inductor and verify
that it does not saturate at a current below about 400mA
(< 2 × 185.2mA).
MIC2570
8
August 2007
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