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參數(shù)資料
| 型號： | LM234Z-3 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 3-Terminal Adjustable Current Sources |
| 中文描述： | 三端可調(diào)電流源 |
| 文件頁數(shù)： | 1/14頁 |
| 文件大小： | 273K |
| 代理商： | LM234Z-3 |
LM134/LM234/LM334
3-Terminal Adjustable Current Sources
General Description
The LM134/LM234/LM334 are 3-terminal adjustable current
sources featuring 10,000:1 range in operating current, excel-
lent current regulation and a wide dynamic voltage range of
1V to 40V. Current is established with one external resistor
and no other parts are required. Initial current accuracy is
±
3%. The LM134/LM234/LM334 are true floating current
sources with no separate power supply connections. In addi-
tion, reverse applied voltages of up to 20V will draw only a
few dozen microamperes of current, allowing the devices to
act as both a rectifier and current source in AC applications.
The sense voltage used to establish operating current in the
LM134 is 64mV at 25C and is directly proportional to abso-
lute temperature (K). The simplest one external resistor
connection, then, generates a current with
≈
+0.33%/C tem-
perature dependence. Zero drift operation can be obtained
by adding one extra resistor and a diode.
Applications for the current sources include bias networks,
surge protection, low power reference, ramp generation,
LED driver, and temperature sensing. The LM234-3 and
LM234-6 are specified as true temperature sensors with
guaranteed initial accuracy of
±
3C and
±
6C, respectively.
These devices are ideal in remote sense applications be-
cause series resistance in long wire runs does not affect ac-
curacy. In addition, only 2 wires are required.
The LM134 is guaranteed over a temperature range of
55C to +125C, the LM234 from 25C to +100C and the
LM334 from 0C to +70C. These devices are available in
TO-46 hermetic, TO-92 and SO-8 plastic packages.
Features
n
Operates from 1V to 40V
n
0.02%/V current regulation
n
Programmable from 1μA to 10mA
n
True 2-terminal operation
n
Available as fully specified temperature sensor
n
±
3% initial accuracy
Connection Diagrams
SO-8
Surface Mount Package
DS005697-24
Order Number LM334M or
LM334MX
See NS Package Number M08A
SO-8 Alternative Pinout
Surface Mount Package
DS005697-25
Order Number LM334SM or
LM334SMX
See NS Package Number M08A
TO-46
Metal Can Package
DS005697-12
V
Pin is electrically connected to case.
Bottom View
Order Number LM134H,
LM234H or LM334H
See NS Package
Number H03H
TO-92 Plastic Package
DS005697-10
Bottom View
Order Number LM334Z, LM234Z-3 or LM234Z-6
See NS Package Number Z03A
March 2000
L
2000 National Semiconductor Corporation
DS005697
www.national.com
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM234Z-3/NOPB | 功能描述:基準(zhǔn)電壓& 基準(zhǔn)電流 3-TERM ADJ CURRENT SOURCE RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Voltage References 拓?fù)浣Y(jié)構(gòu):Shunt References 參考類型:Programmable 輸出電壓:1.24 V to 18 V 初始準(zhǔn)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 |
| LM234Z-3/NOPB | 制造商:Texas Instruments 功能描述:Temperature Sensor IC |
| LM234Z-3/T4 | 制造商:Texas Instruments 功能描述:Current Source 3-Pin TO-92 |
| LM234Z-6 | 制造商:National Semiconductor Corporation 功能描述:3-Terminal Adj Current Source National IC TO-92 Plastic |
| LM234Z-6/LFT7 | 功能描述:基準(zhǔn)電壓& 基準(zhǔn)電流 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Voltage References 拓?fù)浣Y(jié)構(gòu):Shunt References 參考類型:Programmable 輸出電壓:1.24 V to 18 V 初始準(zhǔn)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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