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參數(shù)資料
| 型號： | LM4041EIZ-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:12mm; Format Size:2/3"; 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 |
| 文件大小： | 509K |
| 代理商： | LM4041EIZ-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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