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參數(shù)資料
| 型號： | MSK138 |
| 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(高電壓和磁偏轉應用的150V高工作電壓，高輸出電流的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> | 337K |
| 代理商： | MSK138 |
APPLICATION NOTES
CURRENT LIMIT
(SEE TYPICAL CONNECTION DIAGRAM)
A value of current limit resistance can be calculated as fol-
lows:
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.
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
STABILITY
The MSK 138/139 has sufficient phase margin when com-
pensated for unity gain to be stable with capacitive loads of at
least 10nF. However, it is recommended that the parallel sum
of the input and feedback resistor be 1000 ohms or less for
closed loop gains of ten or less to minimize phase shift caused
by the R-C network formed by the input resistor, feedback re-
sistor and input capacitance. The user can tailor the perfor-
mance of the MSK 138/139 to their application using the ex-
ternal compensation pins. The graphs of small signal gain and
phase as well as the graphs of slew rate and power response
demonstrate the effect of various forms of compensation. The
compensation capacitor must be rated at 150 volts working
voltage if maximum power supply voltages are used. The com-
pensation resistor and capacitor lead lengths must be kept as
short as possible to minimize spurious oscillations. A high quality
NPO capacitor is recommended for the compensation capaci-
tor. An effective method of checking amplifier stability is to
apply the worst case capacitive load to the output of the ampli-
fier 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 138/139 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.
TYPICAL CONNECTION DIAGRAM
CLASS "C" PERFORMANCE
The MSK 138/139 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 148/149.
Rev. A 7/00
3
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相關代理商/技術參數(shù) |
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|---|---|
| MSK1461 | 制造商:MSK 制造商全稱:M.S. Kennedy Corporation 功能描述:HIGH SPEED/VOLTAGE OP AMP |
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