参数资料
型号: MIC4043YM4 TR
厂商: Micrel Inc
文件页数: 5/12页
文件大小: 0K
描述: IC REG SHUNT LOW VOLT SOT-143
标准包装: 1
应用: 转换器,电源
输入电压: 10V
输出数: 1
输出电压: 10V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: TO-253-4,TO-253AA
供应商设备封装: SOT-143
包装: 标准包装
产品目录页面: 1093 (CN2011-ZH PDF)
其它名称: 576-2715-6
MIC4043
Functional Diagram
V REF
1.245V
MIC4043
IN
GND
SNK
FB
Micrel
Functional Description
The MIC4043 combines a G m amplifier, precision 1.245V
reference, and a pass transistor in a single package.
The operation of the MIC4043 is similar to conventional shunt
regulators such as the industry standard ’ 431. In a closed
loop system, the MIC4043 maintains the desired feedback
voltage at the FB pin by sinking current onto the SNK pin
proportional to the error voltage at the FB pin. The ratio of sink
current to error voltage is the transconductance of the device.
Reference
The MIC4043 uses a high-side reference . External voltage
dividers providing feedback to the MIC4043 will be inverted
when compared to those used with ’ 431-equivalent devices.
Behavior
The external feedback voltage is compared to the internal
high-side 1.245V reference.
If the feedback voltage, V FB , is less than V IN – V REF , the
amplifier provides no drive to the sink transistor. If the
feedback voltages is greater than V IN – V REF , the amplifier
drives the pass transistor which sinks current to ground.
November 2000
5
MIC4043
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