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參數(shù)資料
| 型號： | MSK141 |
| 廠商： | MS KENNEDY CORP |
| 元件分類： | 運動控制電子 |
| 英文描述： | Class C High Power Operational Amplifier(高電壓和磁偏轉(zhuǎn)應(yīng)用的150V高工作電壓，C類運算放大器) |
| 中文描述： | OP-AMP, 15000 uV OFFSET-MAX, CDIP8 |
| 封裝： | POWER, HERMETIC SEALED, DIP-8 |
| 文件頁數(shù)： | 3/6頁 |
| 文件大?。?/td> | 336K |
| 代理商： | MSK141 |
APPLICATION NOTES
CURRENT LIMIT
(SEE TYPICAL CONNECTION DIAGRAM)
A value of current limit resistance can be calculated as fol-
lows:
SAFE OPERATING AREA (SOA)
The MOSFET output stage of this power operational ampli-
fier has two distinct limitations:
1. The current handling capability of the die metallization.
2. The junction temperature of the output MOSFET's.
NOTE: The output stage is protected against transient flyback.
However, for protection against sustained, high energy flyback,
external fast-recovery reverse biased diodes should be connected
from the output to ground.
V
R
=I
R
CL
*
R
CL
=(0.83 - (0.0 *
CL
)) / I
CL
Where:
R
CL
is the current limit resistor value
I
CL
is the current limit
0.0 *
CL
is the voltage dropped in the current limit path
across internal impedances other than the actual current
limit resistor
0.83 volts is the voltage drop that must be developed across
the current limit connections to activate the current limit
circuit
The maximum practical value of current limit resistance is 16
ohms. The current limit resistor will decrease available output
voltage swing in the following manner:
V
R
is the reduction in output voltage swing due to the current
limit resistor. It is recommended the user limit output current
to a value as close to the required output current as possible,
without clipping output voltage swing. Current limit will vary
with case temperature. Refer to the typical performance curves
to predict current limit drift. If current limit is not required
replace the resistor with a short.
TYPICAL CONNECTION DIAGRAM
STABILITY
It is recommended that the parallel sum of the input and feed-
back resistor be 1000 ohms or less to minimize phase shift
caused by the R-C network formed by the input resistor, feed-
back resistor and input capacitance. An effective method of
checking amplifier stability is to apply the worst case capaci-
tive load to the output of the amplifier and drive a small signal
square wave across it. If overshoot is less than 25%, the
system will typically be stable.
INPUT PROTECTION
Input protection circuitry within the MSK 141/142 will clip
differential input voltages greater than 16 volts. The inputs are
also protected against common mode voltages up to the supply
rails as well as static discharge. There are 300 ohm current
limiting resistors in series with each input. These resistors may
become damaged in the event the input overload is capable of
driving currents above 1mA. If severe overload conditions are
expected, external input current limiting resistors are recom-
mended.
The MSK 141/142 output is biased for class "C" operation to
yield ultra low quiescent current. A small amount of cross-
over distortion will be present under heavy load conditions.
The user must verify that this condition will not affect circuit
performance. Applications requiring a high degree of linearity
near the zero point with minimum distortion should use the
MSK 151/152.
CLASS "C" PERFORMANCE
Rev. A 7/00
3
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