参数资料
型号: LM4040C82ILPR
厂商: Texas Instruments
文件页数: 28/58页
文件大小: 0K
描述: IC VREF SHUNT PREC 8.192V TO92-3
标准包装: 1
基准类型: 旁路,精度
输出电压: 8.192V
容差: ±0.5%
温度系数: 100ppm/°C
通道数: 1
电流 - 阴极: 110µA
电流 - 输出: 15mA
工作温度: -40°C ~ 85°C
安装类型: 通孔
封装/外壳: TO-226-3、TO-92-3(TO-226AA)成形引线
供应商设备封装: TO-92-3
包装: 剪切带 (CT)
其它名称: 296-22167-1
LM4040
SLOS456K – JANUARY 2005 – REVISED MARCH 2008 .................................................................................................................................................. www.ti.com
Cathode and Load Currents
In a typical shunt-regulator configuration (see Figure 9 ), an external resistor, R S , is connected between the
supply and the cathode of the LM4040. R S must be set properly, as it sets the total current available to supply
the load (I L ) and bias the LM4040 (I Z ). In all cases, I Z must stay within a specified range for proper operation of
the reference. Taking into consideration one extreme in the variation of the load and supply voltage (maximum I L
and minimum V S ), R S must be small enough to supply the minimum I Z required for operation of the regulator, as
given by data-sheet parameters. At the other extreme, maximum V S and minimum I L , R S must be large enough
to limit I Z to less than its maximum-rated value of 15 mA.
R S is calculated according to Equation 1 :
R S +
28
V S * V Z
(I L ) I Z )
V S
R S
I Z + I L
I L
V Z
I Z
LM4040
Figure 9. Shunt Regulator
(1)
Copyright ? 2005–2008, Texas Instruments Incorporated
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