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參數(shù)資料
| 型號： | MC33178P |
| 廠商： | MOTOROLA INC |
| 元件分類： | 運(yùn)動控制電子 |
| 英文描述： | Precision Timer 8-SOIC -40 to 85 |
| 中文描述： | DUAL OP-AMP, 4000 uV OFFSET-MAX, 5 MHz BAND WIDTH, PDIP8 |
| 封裝： | PLASTIC, DIP-8 |
| 文件頁數(shù)： | 10/12頁 |
| 文件大小： | 262K |
| 代理商： | MC33178P |
MC33178 MC33179
10
MOTOROLA ANALOG IC DEVICE DATA
If a high source of resistance is used (R1 > 1.0 k
), a
compensation capacitor equal to or greater than the input
capacitance of the op amp (10 pF) placed across the
feedback resistor (see Figure 34) can be used to neutralize
that pole and prevent outer loop oscillation. Since the closed
loop transient response will be a function of that capacitance,
it is important to choose the optimum value for that capacitor.
This can be determined by the following Equation:
CC = (1 +[R1/R2])2
CL (ZO/R2)
(1)
where: ZO is the output impedance of the op amp.
For moderately high capacitive loads (500 pF < CL
< 1500 pF) the addition of a compensation resistor on the
order of 20
between the output and the feedback loop will
help to decrease miller loop oscillation (see Figure 35). For
high capacitive loads (CL > 1500 pF), a combined
compensation scheme should be used (see Figure 36). Both
the compensation resistor and the compensation capacitor
affect the transient response and can be calculated for
optimum performance. The value of CC can be calculated
using Equation (1). The Equation to calculate RC is as
follows:
(2)
RC = ZO
R1/R2
Figure 34. Compensation for
High Source Impedance
Figure 35. Compensation Circuit for
Moderate Capacitive Loads
Figure 36. Compensation Circuit for
High Capacitive Loads
R2
–
+
R1
ZL
CC
R2
RC
CL
R1
–
+
R2
CC
RC
CL
R1
–
+
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| MC33179D | 功能描述:運(yùn)算放大器 - 運(yùn)放 2-18V Quad Low Power 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(bǔ)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(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| MC33179DG | 功能描述:運(yùn)算放大器 - 運(yùn)放 2-18V Quad Low Power Industrial Temp 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(bǔ)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(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
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