參數(shù)資料
型號(hào)： LM4041CIZ-1.2
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 基準(zhǔn)電壓源/電流源
英文描述： Lens; Focal Length:40mm; Format Size:1/2"; For Use With:Presence Plus Vision Sensors; Leaded Process Compatible:No; Peak Reflow Compatible (260 C):No
中文描述： 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 1.225 V, PBCY3
封裝： PLASTIC, TO-92, 3 PIN
文件頁數(shù)： 15/24頁
文件大?。?/td> 509K
代理商： LM4041CIZ-1.2
www.ti.com
APPLICATION INFORMATION
Adjustable Version
The adjustable version allows V
Z
to be set by a user-defined resistor divider. The output voltage, V
Z
, is set
according to the equation shown in
Figure 14
.
R
S
LM4041
(Adjustable)
V
S
R1
R2
V
Z
= V
REF
1
R2
R1
+
V
REF
Cathode and Load Currents
In a typical shunt regulator configuration (see
Figure 15
), an external resistor, R
, is connected between the
supply and the cathode of the LM4041. R
S
must be set properly, as it sets the total current available to supply
the load (I
L
) and bias the LM4041 (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 recommended rating of 12 mA.
R
S
is calculated as shown in
Equation 1
.
R
S
V
S
(I
L
V
Z
I
Z
)
(1)
LM4041
I
Z
+ I
L
I
L
I
Z
V
S
V
Z
R
S
LM4041
PRECISION MICROPOWER SHUNT VOLTAGE REFERENCE
SLCS146C–FEBRUARY 2005–REVISED MAY 2005
Figure 14. Adjustable Shunt Regulator
Figure 15. Shunt Regulator
15
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