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| 型号： | LM4041CYM3-ADJ TR |
| 厂商： | Micrel Inc |
| 文件页数： | 13/16页 |
| 文件大小： | 0K |
| 描述： | IC VREF SHUNT PREC ADJ SOT-23-3 |
| 标准包装： | 1 |
| 基准类型： | 旁路，可调节，精度 |
| 输出电压： | 1.24 V ~ 10 V |
| 容差： | ±0.5% |
| 温度系数： | 100ppm/°C |
| 通道数： | 1 |
| 电流 - 阴极： | 65µA |
| 电流 - 输出： | 12mA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-236-3，SC-59，SOT-23-3 |
| 供应商设备封装： | SOT-23-3 |
| 包装： | 标准包装 |
| 产品目录页面： | 1111 (CN2011-ZH PDF) |
| 其它名称： | 576-1049-6 |
LM4040/4041
Applications Information
The stable operation of the LM4040 and LM4041 references
requires an external capacitor greater than 10nF connected
between the (+) and (–) pins. Bypass capacitors with values
between 100pF and 10nF have been found to cause the
devices to exhibit instabilities.
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
?oat 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 ?ows through the load (I L )
and the reference (I Q ). Since load current and supply volt-
age 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 maxi-
mum and I L is at its minimum, R S should be large enough so
that the current ?owing through the LM4040-x.x is less than
15mA, and the current ?owing through the LM4041-1.2 or
LM4041-ADJ is less than 12mA.
R S is determined by the supply voltage (V S ), the load and
operating current, (I L and I Q ), and the reference’s reverse
breakdown voltage (V R ):
R s = (V s – V R ) / (I L + I Q )
Typical Application Circuits
Micrel, Inc.
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 ex-
ternal feedback resistors as shown in Figure 2. The output
is found using the equation:
(1) V O = V REF [ (R2/R1) + 1 ]
where V O is the desired output voltage. The actual value of
the internal V REF is a function of V O . The “corrected” V REF
is determined by:
(2) V REF ′ = V O (ΔV REF / ΔV O ) + V Y
where V O is the desired output voltage. ΔV REF / ΔV O is found
in the “Electrical Characteristics” and is typically –1.3mV/V and
V Y is equal to 1.233V. Replace the value of V REF in equation
(1) with the value V REF found using equation (2).
Note that actual output voltage can deviate from that pre-
dicted using the typical ΔV REF / ΔV O in equation (2); for C-
grade parts, the worst-case ΔV REF / ΔV O is –2.5mV/V and
V Y = 1.248V.
The following example shows the difference in output volt-
age resulting from the typical and worst case values of
ΔV REF / ΔV O .
Let V O = +9V. Using the typical values of ΔV REF /ΔV O , V REF
is 1.223V. Choosing a value of R1 = 10kΩ, R2 = 63.272kΩ.
Using the worst case ΔV REF / ΔV O 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
ΔV REF / ΔV O will work in most cases, requiring no further
adjustment.
+ FB 120K
R2
1M
LM4041-ADJ
D1
–
λ
R1
D1
λ
LM4041-
ADJ
+
–
FB
R1
120K
R2
1M
R3
200
< –12V
LED ON
R3
330
> –12V
LED ON
–5V
Figure 3. Voltage Level Detector
–5V
Figure 4. Voltage Level Detector
March 2005
13
M9999-031805
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM4041D12DBZT | 制造商:Texas Instruments 功能描述: |
| LM4041D12IDBZR | 功能描述:基准电压& 基准电流 1.2-V Precision Mcrpwr Shunt 1% acc RoHS:否 制造商:STMicroelectronics 产品:Voltage References 拓扑结构:Shunt References 参考类型:Programmable 输出电压:1.24 V to 18 V 初始准确度:0.25 % 平均温度系数（典型值）:100 PPM / C 串联 VREF - 输入电压（最大值）: 串联 VREF - 输入电压（最小值）: 分流电流（最大值）:60 mA 最大工作温度:+ 125 C 封装 / 箱体:SOT-23-3L 封装:Reel |
| LM4041D12IDBZRG4 | 功能描述:基准电压& 基准电流 1.2-V Precision Mcrpwr Shunt 1% acc RoHS:否 制造商:STMicroelectronics 产品:Voltage References 拓扑结构:Shunt References 参考类型:Programmable 输出电压:1.24 V to 18 V 初始准确度:0.25 % 平均温度系数（典型值）:100 PPM / C 串联 VREF - 输入电压（最大值）: 串联 VREF - 输入电压（最小值）: 分流电流（最大值）:60 mA 最大工作温度:+ 125 C 封装 / 箱体:SOT-23-3L 封装:Reel |
| LM4041D12IDBZT | 功能描述:基准电压& 基准电流 1.2-V Precision Mcrpwr Shunt 1% acc RoHS:否 制造商:STMicroelectronics 产品:Voltage References 拓扑结构:Shunt References 参考类型:Programmable 输出电压:1.24 V to 18 V 初始准确度:0.25 % 平均温度系数（典型值）:100 PPM / C 串联 VREF - 输入电压（最大值）: 串联 VREF - 输入电压（最小值）: 分流电流（最大值）:60 mA 最大工作温度:+ 125 C 封装 / 箱体:SOT-23-3L 封装:Reel |
| LM4041D12IDBZT | 制造商:Texas Instruments 功能描述:IC VOLT REF PREC MCROPWR SOT23-3 制造商:Texas Instruments 功能描述:IC, VOLT REF PREC MCROPWR SOT23-3 制造商:Texas Instruments 功能描述:IC, VOLT REF PREC MCROPWR SOT23-3; Topology:Shunt; Reference Voltage:1.23V; Reference Voltage Tolerance:12mV; Voltage Reference Case Style:SOT-23; No. of Pins:3; Temperature Coefficient:150ppm/C; Operating Temperature Range:-40C to;RoHS Compliant: Yes 制造商:Texas Instruments 功能描述:IC, VOLT REF PREC MCROPWR SOT23-3; Topology:Shunt; Reference Voltage:1.23V; Reference Voltage Tolerance:12mV; Voltage Reference Case Style:SOT-23; No. of Pins:3; Temperature Coefficient:150ppm/C; SVHC:No SVHC (19-Dec-2012); Base ;RoHS Compliant: Yes |
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