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參數(shù)資料
| 型號： | LM4051AIM3-1.2 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | Precision Micropower Shunt Voltage Reference |
| 中文描述： | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 1.225 V, PDSO3 |
| 封裝： | 3 X 1.30 MM, PLASTIC, TO-236AB, SOT-23, 3 PIN |
| 文件頁數(shù)： | 9/14頁 |
| 文件大?。?/td> | 301K |
| 代理商： | LM4051AIM3-1.2 |
Applications Information
The LM4051 is a precision micro-power curvature-corrected
bandgap shunt voltage reference. For space critical applica-
tions, the LM4051 is available in the sub-miniature SSOT-23
surface-mount package. The LM4051 has been designed for
stable operation without the need of an external capacitor
connected between the “+” pin and the “” pin. If, however, a
bypass capacitor is used, the LM4051 remains stable. De-
sign effort is further reduced with the choice of either a fixed
1.2V or an adjustable reverse breakdown voltage. The mini-
mum operating current is 60 μA for the LM4051-1.2 and the
LM4051-ADJ. Both versions have a maximum operating cur-
rent of 12 mA.
LM4051s using the SSOT-23 package have pin 3 connected
as the (-) output through the package’s die attach interface.
Therefore, the LM4051-1.2’s pin 3 must be left floating or
connected to pin 2 and the LM4051-ADJ’s pin 3 is the (-) out-
put.
In a conventional shunt regulator application (Figure 1) an
external series resistor (R
) is connected between the sup-
ply voltage and the LM4051. R
determines the current that
flows through the load (I
) and the LM4051 (I
). Since load
current and supply voltage may vary, R
should be small
enough to supply at least the minimum acceptable I
to the
LM4051 even when the supply voltage is at its minimum and
the load current is at its maximum value. When the supply
voltage is at its maximum and I
L
is at its minimum, R
S
should
be large enough so that the current flowing through the
LM4051 is less than 12 mA.
R
S
should be selected based on the supply voltage, (V
S
), the
desired load and operating current, (I
L
and I
Q
), and the
LM4051’s reverse breakdown voltage, V
R
.
The LM4051-ADJ’s output voltage can be adjusted to any
value in the range of 1.24V through 10V. It is a function of the
internal reference voltage (V
REF
) and the ratio of the external
feedback resistors as shown in Figure 2 . The output voltage
is found using the equation
V
O
= V
REF
[(R2/R1) + 1]
(1)
(2)
where V
O
is the output voltage. The actual value of the inter-
nal V
REF
is a function of V
O
. The “corrected” V
REF
is deter-
mined by
V
REF
= V
O
(
V
REF
/
V
O
) + V
Y
where
V
Y
= 1.22V
V
/
V
is found in the Electrical Characteristics and is
typically 1.55 mV/V. You can get a more accurate indication
of the output voltage by replacing the value of V
REF
in equa-
tion (1) with the value found using equation (3).
(3)
Typical Applications
DS101222-22
FIGURE 1. Shunt Regulator
DS101222-34
FIGURE 2. Adjustable Shunt Regulator
L
www.national.com
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LM4051AIM3-ADJ | 功能描述:基準電壓& 基準電流 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Voltage References 拓撲結構:Shunt References 參考類型:Programmable 輸出電壓:1.24 V to 18 V 初始準確度:0.25 % 平均溫度系數(shù)（典型值）:100 PPM / C 串聯(lián) VREF - 輸入電壓（最大值）: 串聯(lián) VREF - 輸入電壓（最小值）: 分流電流（最大值）:60 mA 最大工作溫度:+ 125 C 封裝 / 箱體:SOT-23-3L 封裝:Reel |
| LM4051AIM3-ADJ | 制造商:Texas Instruments 功能描述:IC SM ADJUSTABLE REFERENCE 0.1% |
| LM4051AIM3-ADJ/NOPB | 功能描述:基準電壓& 基準電流 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Voltage References 拓撲結構:Shunt References 參考類型:Programmable 輸出電壓:1.24 V to 18 V 初始準確度:0.25 % 平均溫度系數(shù)（典型值）:100 PPM / C 串聯(lián) VREF - 輸入電壓（最大值）: 串聯(lián) VREF - 輸入電壓（最小值）: 分流電流（最大值）:60 mA 最大工作溫度:+ 125 C 封裝 / 箱體:SOT-23-3L 封裝:Reel |
| LM4051AIM3ADJNOPB | 制造商:National Semiconductor 功能描述:V-Ref Adjustable 1.24V to 10V 12mA 3-Pin SOT-23 T/R |
| LM4051AIM3X-1.2 | 功能描述:基準電壓& 基準電流 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Voltage References 拓撲結構:Shunt References 參考類型:Programmable 輸出電壓:1.24 V to 18 V 初始準確度:0.25 % 平均溫度系數(shù)（典型值）:100 PPM / C 串聯(lián) VREF - 輸入電壓（最大值）: 串聯(lián) VREF - 輸入電壓（最小值）: 分流電流（最大值）:60 mA 最大工作溫度:+ 125 C 封裝 / 箱體:SOT-23-3L 封裝:Reel |
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