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LM12CLK 데이터시트(PDF) 6 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
부품명 LM12CLK
상세설명  80W Operational Amplifier
Download  14 Pages
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제조업체  NSC [National Semiconductor (TI)]
홈페이지  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM12CLK 데이터시트(HTML) 6 Page - National Semiconductor (TI)

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Application Information (Continued)
aid stability. In all cases, the op amp will behave predictably
only if the supplies are properly bypassed, ground loops are
controlled and high-frequency feedback is derived directly
from the output terminal, as recommended earlier.
So-called capacitive loads are not always capacitive. A
high-Q capacitor in combination with long leads can present
a series-resonant load to the op amp. In practice, this is not
usually a problem; but the situation should be kept in mind.
Large capacitive loads (including series-resonant) can be
accommodated by isolating the feedback amplifier from the
load as shown above. The inductor gives low output imped-
ance at lower frequencies while providing an isolating im-
pedance at high frequencies. The resistor kills the Q of se-
ries resonant circuits formed by capacitive loads. A low
inductance, carbon-composition resistor is recommended.
Optimum values of L and R depend upon the feedback gain
and expected nature of the load, but are not critical. A 4 µH
inductor is obtained with 14 turns of number 18 wire, close
spaced, around a one-inch-diameter form.
The LM12 can be made stable for all loads with a large ca-
pacitor on the output, as shown above. This compensation
gives the lowest possible closed-loop output impedance at
high frequencies and the best load-transient response. It is
appropriate for such applications as voltage regulators.
A feedback capacitor, C
1, is connected directly to the output
pin of the IC. The output capacitor, C
2, is connected at the
output terminal with short leads. Single-point grounding to
avoid dc and ac ground loops is advised.
The impedance, Z
1, is the wire connecting the op amp output
to the load capacitor. About 3-inches of number-18 wire
(70 nH) gives good stability and 18-inches (400 nH) begins
to degrade load-transient response. The minimum load ca-
pacitance is 47 µF, if a solid-tantalum capacitor with an
equivalent series resistance (ESR) of 0.1
Ω is used. Electro-
lytic capacitors work as well, although capacitance may have
to be increased to 200 µF to bring ESR below 0.1
Ω.
Loop stability is not the only concern when op amps are op-
erated with reactive loads. With time-varying signals, power
dissipation can also increase markedly. This is particularly
true
with
the
combination
of
capacitive
loads
and
high-frequency excitation.
INPUT COMPENSATION
The LM12 is prone to low-amplitude oscillation bursts com-
ing out of saturation if the high-frequency loop gain is near
unity. The voltage follower connection is most susceptible.
This glitching can be eliminated at the expense of
small-signal bandwidth using input compensation. Input
compensation can also be used in combination with LR load
isolation to improve capacitive load stability.
An example of a voltage follower with input compensation is
shown here. The R
2C2 combination across the input works
with R
1 to reduce feedback at high frequencies without
greatly affecting response below 100 kHz. A lead capacitor,
C
1, improves phase margin at the unity-gain crossover fre-
quency. Proper operation requires that the output impedance
of the circuitry driving the follower be well under 1 k
Ω at fre-
quencies up to a few hundred kilohertz.
Extending input compensation to the integrator connection is
shown here. Both the follower and this integrator will handle
1 µF capacitive loading without LR output isolation.
CURRENT DRIVE
This circuit provides an output current proportional to the in-
put voltage. Current drive is sometimes preferred for servo
motors because it aids in stabilizing the servo loop by reduc-
ing phase lag caused by motor inductance. In applications
requiring high output resistance, such as operational power
supplies running in the current mode, matching of the feed-
back resistors to 0.01% is required. Alternately, an adjust-
able resistor can be used for trimming.
DS008704-7
DS008704-8
DS008704-9
DS008704-10
DS008704-11
www.national.com
6


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