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LM12CL
80W Operational Amplifier
General Description
The LM12 is a power op amp capable of driving ±25V at
±10A while operating from ±30V supplies. The monolithic IC
can deliver 80W of sine wave power into a 4? load with
0.01% distortion. Power bandwidth is 60 kHz. Further, a
peak dissipation capability of 800W allows it to handle reac-
tive loads such as transducers, actuators or small motors
without derating. Important features include:
? input protection
? controlled turn on
? thermal limiting
? overvoltage shutdown
? output-current limiting
? dynamic safe-area protection
The IC delivers ±10A output current at any output voltage
yet is completely protected against overloads, including
shorts to the supplies. The dynamic safe-area protection is
provided by instantaneous peak-temperature limiting within
the power transistor array.
The turn-on characteristics are controlled by keeping the
output open-circuited until the total supply voltage reaches
14V. The output is also opened as the case temperature ex-
ceeds 150?C or as the supply voltage approaches the
BV
CEO
of the output transistors. The IC withstands overvolt-
ages to 80V.
This monolithic op amp is compensated for unity-gain feed-
back, with a small-signal bandwidth of 700 kHz. Slew rate is
9V/?s, even as a follower. Distortion and caPACitive-load sta-
bility rival that of the best designs using complementary out-
put transistors. Further, the IC withstands large differential
input voltages and is well behaved should the
common-mode range be exceeded.
The LM12 establishes that monolithic ICs can deliver consid-
erable output power without resorting to complex switching
schemes. Devices can be paralleled or bridged for even
greater output capability. Applications include operational
power supplies, high-voltage regulators, high-quality audio
amplifiers, tape-head positioners, x-y plotters or other
servo-control systems.
The LM12 is supplied in a four-lead, TO-3 package with V?
on the case. A gold-eutectic die-attach to a molybdenum in-
terface is used to avoid thermal fatigue problems. The LM12
is specified for either military or commercial temperature
range.
Connection Diagram Typical Application*
DS008704-1
4-pin glass epoxy TO-3
socket is available from
AUGAT INC.
Part number 8112-AG7
Bottom View
Order Number LM12CLK
See NS Package Number K04A
DS008704-2
*Low distortion (0.01%) audio amplifier
May 1999
LM12CL
80W
Operational
Amplifier
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