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參數(shù)資料
| 型號(hào)： | LM4041EIZ-1.2/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 1.225 V, PBCY3 |
| 封裝： | PLASTIC, TO-92, 3 PIN |
| 文件頁(yè)數(shù)： | 5/19頁(yè) |
| 文件大?。?/td> | 774K |
| 代理商： | LM4041EIZ-1.2/NOPB |
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Applications Information
The LM4041 is a precision micro-power curvature-corrected
bandgap shunt voltage reference. For space critical applica-
tions, the LM4041 is available in the sub-miniature SOT-23
and SC70 surface-mount package. The LM4041 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 LM4041 remains
stable. Design effort is further reduced with the choice of
either a fixed 1.2V or an adjustable reverse breakdown
voltage. The minimum operating current is 60 A for the
LM4041-1.2 and the LM4041-ADJ. Both versions have a
maximum operating current of 12 mA.
LM4041s using the SOT-23 package have pin 3 connected
as the (-) output through the package’s die attach interface.
Therefore, the LM4041-1.2’s pin 3 must be left floating or
connected to pin 2 and the LM4041-ADJ’s pin 3 is the (-)
output.
LM4041s using the SC70 package have pin 2 connected as
the () output through the packages’ die attach interface.
Therefore, the LM4041-1.2’s pin 2 must be left floating or
connected to pin 1, and the LM4041-ADJ’s pin 2 is the ()
output.
The typical thermal hysteresis specification is defined as the
change in +25C voltage measured after thermal cycling.
The device is thermal cycled to temperature -40C and then
measured at 25C. Next the device is thermal cycled to
temperature +125C and again measured at 25C. The re-
sulting V
OUT delta shift between the 25C measurements is
thermal hysteresis. Thermal hysteresis is common in preci-
sion references and is induced by thermal-mechanical pack-
age stress. Changes in environmental storage temperature,
operating temperature and board mounting temperature are
all factors that can contribute to thermal hysteresis.
In a conventional shunt regulator application (Figure 1), an
external series resistor (R
S) is connected between the sup-
ply voltage and the LM4041. R
S determines the current that
flows through the load (I
L) and the LM4041 (IQ). Since load
current and supply voltage may vary, R
S should be small
enough to supply at least the minimum acceptable I
Q to the
LM4041 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, RS should
be large enough so that the current flowing through the
LM4041 is less than 12 mA.
R
S should be selected based on the supply voltage, (VS), the
desired load and operating current, (I
L and IQ), and the
LM4041’s reverse breakdown voltage, V
R.
The LM4041-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 =VREF[(R2/R1) + 1]
(1)
where V
O is the output voltage. The actual value of the
internal V
REF is a function of VO. The “corrected” VREF is
determined by
V
REF =
V
O (
V
REF/
V
O)+VY
(2)
where
V
Y = 1.240 V
and
V
O =(VO VY)
V
REF/
V
O 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
equation (1) with the value found using equation (2).
Note that the actual output voltage can deviate from that
predicted using the typical value of
V
REF/
V
O in equation
(2): for C-grade parts, the worst-case
V
REF/
V
O is 2.5
mV/V. For D-grade parts, the worst-case
V
REF/
V
O is 3.0
mV/V.
Typical Applications
01139222
FIGURE 1. Shunt Regulator
01139234
V
O =VREF[(R2/R1) + 1]
FIGURE 2. Adjustable Shunt Regulator
LM4041
www.national.com
13
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參數(shù)描述 |
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| LM4041QAIM3-1.2/NO | 功能描述:Shunt Voltage Reference IC ±0.1% 12mA TO-236-3, SC-59, SOT-23-3 制造商:texas instruments 系列:汽車級(jí)，AEC-Q100 包裝:剪切帶（CT） 零件狀態(tài):有效 參考類型:分流器 輸出類型:固定 電壓 - 輸出（最小值/固定）:1.225V 電壓 - 輸出（最大值）:- 電流 - 輸出:12mA 容差:±0.1% 溫度系數(shù):100ppm/°C 噪聲 - 0.1Hz 至 10Hz:- 噪聲 - 10Hz 至 10Hz:20μVrms 電壓 - 輸入:- 電流 - 電源:- 電流 - 陰極:65μA 工作溫度:-40°C ~ 85°C（TA） 安裝類型:表面貼裝 封裝/外殼:TO-236-3，SC-59，SOT-23-3 供應(yīng)商器件封裝:SOT-23-3 標(biāo)準(zhǔn)包裝:1 |
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