- 您现在的位置：买卖IC网 > PDF目录364590 > AB-099 AB-099 - AN EASY SOLUTION TO CURRENT LIMITING AN OP AMP PDF资料下载
参数资料
| 型号： | AB-099 |
| 英文描述： | AB-099 - AN EASY SOLUTION TO CURRENT LIMITING AN OP AMP |
| 中文描述： | 抗体- 099 -简单的解决办法限流运算放大器 |
| 文件页数： | 2/2页 |
| 文件大小： | 22K |
| 代理商： | AB-099 |
2
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes
no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change
without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant
any BURR-BROWN product for use in life support devices and/or systems.
In the clamping mode, when the voltage across the two
zeners reaches
±
(V
Z
+ V
F
), the circuit goes from acting as a
voltage amplifier to acting as a voltage reference; the volt-
age across R
is fixed and the potentiometer output is
±
x(V
Z
+V
F
). Further increase in the magnitude of the signal at E
I
can’t change this potentiometer value until it drops below
the limit point V
L
.
Thus, clamping is no longer limited to the fixed levels of
available zener voltages. Even clamping levels as low as
5mV become practical when offset-trimmable OPA111 op
amps replace the OPA2111. However, available zener volt-
ages and the closed-loop gain of A
2
set the maximum
clamping level.
Use of 10 –V zeners and a gain of one for A
can cover the
voltage range of most analog-signal processing. Unfortu-
nately, the voltage temperature coefficients of 10 –V zeners
would produce thermal drift in the clamping level. With 5.6
–V zeners, however, the temperature coefficients of the
zener and forward voltages tend to cancel. For such zener
diodes V
+ V
= 6.2V, and the net drift is near zero. Then,
with A
2
set to a gain of 1.77, the maximum limit voltage V
L
is 11V.
The 5% tolerances of the zener voltages determine the basic
accuracy of the clamp levels. The gain-setting resistors R
2
and R
impose additional tolerance error. However, adjust-
ing the gain with these resistors can compensate for any
zener-voltage error and resistor tolerances. With matched
zeners, the adjustment can readily reduce the clamp-level
errors to less than 1%. Without matching, the 5% error of
simple zener clamping prevails, but the circuit still clamps
sharply.
For frequency stability, resistor R
and capacitor C supply a
frequency roll-off in A
. At high frequencies, the capacitor
shorts the output of A
to its inverting input. Then A
and A
2
operate with independent feedback loops, and the overall
circuit requires stability in the individual amplifiers.
相关PDF资料 |
PDF描述 |
|---|---|
| AB-142 | AB-142 - ADS7843 PEN INTERRUPT |
| AB-143 | AB-143 - Multi-DDC112 DUT Board for the DDC112 Evaluation Fixture |
| AB-144 | AB-144 - NEW SOFTWARE FOR THE DDC112 EVALUATION FIXTURE |
| AB-146 | AB-146 - USING THE ADS1201 EVALUATION BOARD |
| AB-147 | AB-147 - Control Port and Reset Operation for Burr-Brown SoundPlus Audio Converters and CODECs |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AB1 | 功能描述:处理器配件 with 128KB SRAM RoHS:否 制造商:Olimex Ltd. 产品:Cable 用于: |
| AB1 B | 制造商:Omnimount 功能描述:2.5 Lbs Speaker Bracket |
| AB-1.544MHZ-7-R800-B-4-Z-T | 制造商:Abracon Corporation 功能描述:AB Series 1.544 MHz 30 ppm 7 pF -20 to +70 C Through Hole Crystal |
| AB-1.8432MHZ-B2 | 功能描述:晶体 +/-20ppm 1.8432MHZ FUNDAMENTAL RoHS:否 制造商:AVX 频率:26 MHz 容差: 频率稳定性:50 PPM 负载电容:8 pF 端接类型:SMD/SMT 封装 / 箱体:1210 (3225 metric) 工作温度范围:- 40 C to + 150 C 尺寸:2.5 mm W x 3.2 mm L x 0.85 mm H 封装:Reel |
| AB-1.8432MHZ-B2-T | 功能描述:1.8432MHz ±20ppm 晶体 18pF 750 欧姆 -20°C ~ 70°C 通孔 HC49/U 制造商:abracon llc 系列:AB 包装:带卷（TR） 零件状态:有效 类型:MHz 晶体 频率:1.8432MHz 频率稳定度:±100ppm 频率容差:±20ppm 负载电容:18pF ESR（等效串联电阻）:750 欧姆 工作模式:基谐 工作温度:-20°C ~ 70°C 等级:- 安装类型:通孔 封装/外壳:HC49/U 大小/尺寸:0.453" 长 x 0.197" 宽（11.50mm x 5.00mm） 高度:0.530"（13.46mm） 标准包装:1,000 |
发布紧急采购，3分钟左右您将得到回复。