參數(shù)資料
型號： TL051AMFK
廠商： Texas Instruments, Inc.
英文描述： ENHANCED-JFET LOW-OFFSET OPERATIONAL AMPLIFIERS
中文描述： 增強型場效應低失調運算放大器
文件頁數(shù)： 57/65頁
文件大小： 1022K
代理商： TL051AMFK
TL05x, TL05xA, TL05xY
ENHANCED-JFET LOW-OFFSET
OPERATIONAL AMPLIFIERS
SLOS178 – FEBRUARY 1997
57
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
precision constant-current source over temperature
A precision current source (see Figure 85) benefits from the high input impedance and stability of Texas
Instruments enhanced-JFET process. A low-current shunt regulator maintains 2.5 V between the inverting input
and the output of the TL05x. The negative feedback then forces 2.5 V across the current setting resistor R;
therefore, the current to the load is simply 2.5 V divided by R.
Possible choices for the shunt regulator include the LT1004, LT1009, and LM385. If the regulator’s cathode
connects to the operational amplifier output, this circuit sources load current. Similarly, if the cathode connects
to the inverting input, the circuit sinks current from the load. To minimize output current change with temperature,
R should be a metal film resistor with a low temperature coefficient. Also, this circuit must be operated with
split-voltage supplies.
+
–
+
–
150 pF
U2
+ 15 V
U1
– 15 V
R
100 k
IO
Load
V = 0 to 10 V
(a) SOURCE CURRENT LOAD
(b) SINK CURRENT LOAD
V = 0 to –10 V
Load
II
R
– 15 V
U1
+ 15 V
150 pF
U2
100 k
NOTE B: U1 = 1/2 TL05x
U2 = LM385, LT1004, or LT1009 voltage reference
I =2R
, R = Low temperature coefficient metal film resistor
Figure 85. Precision Constant-Current Source
相關PDF資料
PDF描述
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TL051CD 功能描述:運算放大器 - 運放 Enhanced JFET Prec RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel
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