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參數(shù)資料
| 型號(hào)： | LM4040AIM3-5.0Y |
| 廠商： | MICREL INC |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 5 V, PDSO3 |
| 封裝： | SOT-23, 3 PIN |
| 文件頁(yè)數(shù)： | 4/16頁(yè) |
| 文件大小： | 110K |
| 代理商： | LM4040AIM3-5.0Y |
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LM4040/4041
Micrel
LM4040/4041
12
January 2000
Applications Information
The LM4040 and LM4041 have been designed for stable
operation without the need of an external capacitor con-
nected between the (+) and (–) pins. If a bypass capacitor is
used, the references remain stable.
Schottky Diode
LM4040-x.x and LM4041-1.2 in the SOT-23 package have a
parasitic Schottky diode between pin 2 (–) and pin 3 (die
attach interface connect). Pin 3 of the SOT-23 package must
float or be connected to pin 2. LM4041-ADJs use pin 3 as the
(–) output.
Conventional Shunt Regulator
In a conventional shunt regulator application (see Figure 1),
an external series resistor (R
S) is connected between the
supply voltage and the LM4040-x.x or LM4041-1.2 reference.
R
S determines the current that flows through the load (IL) and
the reference (I
Q). 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 reference 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 LM4040-x.x is less than
15mA, and the current flowing through the LM4041-1.2 or
LM4041-ADJ is less than 12mA.
R
S is determined by the supply voltage (VS), the load and
operating current, (I
L and IQ), and the reference’s reverse
breakdown voltage (V
R).
R
s = (Vs – VR) / (IL + IQ)
Adjustable Regulator
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 is found
using the equation
(1)
V
O = VREF [ (R2/R1) + 1 ]
where V
O is the desired output voltage. The actual value of
the internal V
REF is a function of VO. The “corrected” VREF is
determined by
(2)
V
REF = VO (VREF / VO) + VY
where V
O is the desired output voltage. VREF / VO is found
in the Electrical Characteristics and is typically –1.3mV/V and
V
Y is equal to 1.233V. Replace the value of VREF in equation
(1) with the value found using equation (2).
Note that actual output voltage can deviate from that pre-
dicted using the typical
V
REF / VO in equation (2); for C-
grade parts, the worst-case
V
REF / VO is –2.5mV/V and
V
Y = 1.248V.
The following example shows the difference in output voltage
resulting from the typical and worst case values of
V
REF / VO:
Let V
O = +9V. Using the typical values of VREF /VO , VREF
is 1.223V. Choosing a value of R1 = 10k
, R2 = 63.272k.
Using the worst case
V
REF / VO for the C-grade and D-
grade parts, the output voltage is actually 8.965V and 8.946V
respectively. This results in possible errors as large as 0.39%
for the C-grade parts and 0.59% for the D-grade parts. Once
again, resistor values found using the typical value of
V
REF / VO will work in most cases, requiring no further
adjustment.
Figure 4. Voltage Level Detector
R1
120k
R2
1M
FB
+
–
LM4041-ADJ
D1
λ
< –12V
LED ON
R3
200
–5V
D1
λ
LM4041-
ADJ
R1
120k
R2
1M
FB
–
+
R3
330
> –12V
LED ON
–5V
Figure 3. Voltage Level Detector
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM4040AIM3-8.2 | 功能描述:IC VREF SHUNT PREC 8.192V SOT23 RoHS:是 類別:集成電路 (IC) >> PMIC - 電壓基準(zhǔn) 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 基準(zhǔn)類型:串聯(lián)，精度 輸出電壓:4.5V 容差:±800µV 溫度系數(shù):1ppm/°C 輸入電壓:13.5 V ~ 22 V 通道數(shù):1 電流 - 陰極:- 電流 - 靜態(tài):7mA 電流 - 輸出:10mA 工作溫度:-55°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:20-LCC 供應(yīng)商設(shè)備封裝:20-CLCC 包裝:管件 |
| LM4040AIM3-8.2/NOPB | 功能描述:IC VREF SHUNT PREC 8.192V SOT23 RoHS:是 類別:集成電路 (IC) >> PMIC - 電壓基準(zhǔn) 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 基準(zhǔn)類型:串聯(lián)，精度 輸出電壓:4.5V 容差:±800µV 溫度系數(shù):1ppm/°C 輸入電壓:13.5 V ~ 22 V 通道數(shù):1 電流 - 陰極:- 電流 - 靜態(tài):7mA 電流 - 輸出:10mA 工作溫度:-55°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:20-LCC 供應(yīng)商設(shè)備封裝:20-CLCC 包裝:管件 |
| LM4040AIM3-8.2/NOPB | 制造商:Texas Instruments 功能描述:, Voltage Reference Type:Series, Referen |
| LM4040AIM3-8.2/T/R | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Voltage Reference |
| LM4040AIM3X10 | 制造商:NATIONAL 功能描述:* |
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