参数资料
型号: TL4051CIDCKRG4
厂商: TEXAS INSTRUMENTS INC
元件分类: 基准电压源/电流源
英文描述: 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 1.212 V, PDSO5
封装: GREEN, PLASTIC, SC-70, 5 PIN
文件页数: 5/25页
文件大小: 613K
代理商: TL4051CIDCKRG4
www.ti.com
Adjustable Version
R
S
TL4051x (Adj)
VS
R1
R2
V = V
(1 + R2/R1)
Z
REF
+
V
REF
-
Cathode and Load Currents
R
S
+
V
S
* VZ
(I
L
) IZ)
(1)
TL4051x12
I + I
Z
L
I
L
I
Z
V
S
V
Z
R
S
PRECISION MICROPOWER SHUNT VOLTAGE REFERENCE
SLOS487 – JUNE 2007
APPLICATION INFORMATION (continued)
The adjustable version allows VZ to be set by a user-defined resistor divider. The output voltage, VZ, is set
according to the equation shown in Figure 3.
Figure 3. Adjustable Shunt Regulator
In a typical shunt regulator configuration (see Figure 4), an external resistor, RS, is connected between the
supply and the cathode of the TL4051. RS must be set properly, as it sets the total current available to supply
the load (IL) and bias the TL4051 (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 recommended rating of 12 mA.
RS is calculated as shown in Equation 1.
Figure 4. Shunt Regulator
13
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相关代理商/技术参数
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