參數(shù)資料
型號: LM4040B20IDBZR
廠商: TEXAS INSTRUMENTS INC
元件分類: 基準(zhǔn)電壓源/電流源
英文描述: 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 2.048 V, PDSO3
封裝: GREEN, PLASTIC, SOT-23, 3 PIN
文件頁數(shù): 21/56頁
文件大小: 773K
代理商: LM4040B20IDBZR
Cathode and Load Currents
R
S
+
V
S
* VZ
(I
L
) IZ)
(1)
LM4040
IZ + IL
IL
IZ
VS
VZ
RS
LM4040
SLOS456K – JANUARY 2005 – REVISED MARCH 2008 .................................................................................................................................................. www.ti.com
In a typical shunt-regulator configuration (see Figure 9), an external resistor, RS, is connected between the
supply and the cathode of the LM4040. RS must be set properly, as it sets the total current available to supply
the load (IL) and bias the LM4040 (IZ). In all cases, IZ 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 IL
and minimum VS), RS must be small enough to supply the minimum IZ required for operation of the regulator, as
given by data-sheet parameters. At the other extreme, maximum VS and minimum IL, RS must be large enough
to limit IZ to less than its maximum-rated value of 15 mA.
RS is calculated according to Equation 1:
Figure 9. Shunt Regulator
28
Copyright 2005–2008, Texas Instruments Incorporated
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