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參數(shù)資料
| 型號(hào)： | MSK171 |
| 廠商： | MS KENNEDY CORP |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | High Power Dual Operational Amplifier(高電壓高輸出電流低失真雙運(yùn)算放大器) |
| 中文描述： | DUAL OP-AMP, 10000 uV OFFSET-MAX, CDIP8 |
| 封裝： | POWER, DIP-8 |
| 文件頁數(shù)： | 3/6頁 |
| 文件大?。?/td> | 364K |
| 代理商： | MSK171 |
APPLICATION NOTES
SAFE OPERATING AREA (SOA)
AMPLIFIER STABILITY
Since both output transistors in this amplifier are NPN, con-
sideration must be taken when stabilizing the output. A one
ohm resistor, 0.1uF capacitor snubber network has been added
internally from the output to -Vcc on each amplifier. This con-
figuration minimizes local output stage oscillations. As always,
adequate power supply bypassing is a necessity for ampli-
fier stability. A parallel combination of a 4.7uF electrolytic (for
every amp of output current) and a 0.01uF ceramic disc capaci-
tor should be connected as close as possible to the package
power supply pins to ground. The R-C snubber networks shown
on the outputs of the amplifiers in the typical circuits are inter-
nal and should not be added externally.
If the inductive load is driven near steady state conditions al-
lowing the output to drop more than 6V below the supply rail
while the amplifier is current limiting, the inductor should be
capacitively coupled or the supply voltage must be lowered to
meet the SOA criteria. It is a good practive to also connect
reverse biased fast recovery diodes to the output for protection
against sustained high energy flyback.
±Vcc
20V
15V
10V
5V
Capacitive Load
200uF
500uF
5mF
50mF
Inductive Load
7.5mH
25mH
35mH
150mH
Safe operating area curves are a graphical representation of
all of the power limiting factors involved in the output stage of
an operational amplifier. Three major power limiting factors
are; output transistor wire bond carrying capability, output tran-
sistor junction temperature and secondary breakdown effects.
To see if your application is meeting or exceeding the limita-
tions of the safe operating area curves, perform the following
steps:
1.) Find the worst case output power dissipation. For a split
supply, purely resistive load application, this occurs when
V
OUT
=1/2 V
CC
.
2.) Take the values of (V
CC
-V
OUT
) and the corresponding out-
put current and find their intersection on the safe operating
area curves.
3.) Verify this point is below the safe operating area curves.
This is a simple task for purely resistive loads, for reactive loads
the following table will save extensive analysis. Under tran-
sient conditions, capacitive and inductive loads up to the fol-
lowing maximum are safe.
BIDIRECTIONAL MOTOR DRIVE
PARALLEL CONNECTION
(yields single 6A amplifier)
Rev. C 8/00
3
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