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LM12CL データシート(PDF) 9 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部品番号 LM12CL
部品情報  80W Operational Amplifier
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メーカー  NSC [National Semiconductor (TI)]
ホームページ  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM12CL データシート(HTML) 9 Page - National Semiconductor (TI)

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Application Information (Continued)
OPERATIONAL POWER SUPPLY
External current limit can be provided for a power op amp as shown above. The positive and negative current limits can be set
precisely and independently. Fast response is assured by D
1 and D2. Adjustment range can be set down to zero with potentiom-
eters R
3 and R7. Alternately, the limit can be programmed from a voltage supplied to R2 and R6. This is the set up required for
an operational power supply or voltage-programmable power source.
SERVO AMPLIFIERS
When making servo systems with a power op amp, there is
a temptation to use it for frequency shaping to stabilize the
servo loop. Sometimes this works; other times there are bet-
ter ways; and occasionally it just doesn’t fly. Usually it’s a
matter of how quickly and to what accuracy the servo must
stabilize.
This motor/tachometer servo gives an output speed propor-
tional to input voltage. A low-level op amp is used for fre-
quency shaping while the power op amp provides current
drive to the motor. Current drive eliminates loop phase shift
due to motor inductance and makes high-performance ser-
vos easier to stabilize.
This position servo uses an op amp to develop the rate sig-
nal
electrically
instead
of
using
a
tachometer.
In
high-performance servos, rate signals must be developed
with large error signals well beyond saturation of the motor
drive. Using a separate op amp with a feedback clamp al-
lows the rate signal to be developed properly with position
errors more than an order of magnitude beyond the
loop-saturation level as long as the photodiode sensors are
positioned with this in mind.
DS008704-19
Note: Supply voltages for the LM318s are ±15V
DS008704-20
DS008704-21
www.national.com
9


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