LM12CLK National Semiconductor, LM12CLK Datasheet

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LM12CLK

Manufacturer Part Number
LM12CLK
Description
80W Operational Amplifier
Manufacturer
National Semiconductor
Datasheet

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© 2008 National Semiconductor Corporation
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 4Ω load with 0.01%
distortion. Power bandwidth is 60 kHz. Further, a peak dissi-
pation capability of 800W allows it to handle reactive loads
such as transducers, actuators or small motors without der-
ating. Important features include:
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 out-
put open-circuited until the total supply voltage reaches 14V.
The output is also opened as the case temperature exceeds
150°C or as the supply voltage approaches the BV
output transistors. The IC withstands overvoltages to 80V.
Connection Diagram
4-pin glass epoxy TO-3
socket is available from
AUGAT INC.
Part number 8112-AG7
input protection
controlled turn on
thermal limiting
overvoltage shutdown
output-current limiting
dynamic safe-area protection
See NS Package Number K04A
Order Number LM12CLK
Bottom View
8704 Version 7 Revision 4
8704
870401
CEO
of the
Print Date/Time: 2008/09/16 12:48:40
This monolithic op amp is compensated for unity-gain feed-
back, with a small-signal bandwidth of 700 kHz. Slew rate is
9V/μs, 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.
Typical Application*
*Low distortion (0.01%) audio amplifier
September 16, 2008
OBSOLETE
www.national.com
870402

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LM12CLK Summary of contents

Page 1

... TO-3 socket is available from AUGAT INC. Part number 8112-AG7 Bottom View Order Number LM12CLK See NS Package Number K04A © 2008 National Semiconductor Corporation 8704 Version 7 Revision 4 This monolithic op amp is compensated for unity-gain feed- back, with a small-signal bandwidth of 700 kHz. Slew rate is 9V/μ ...

Page 2

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Total Supply Voltage (Note 1) Input Voltage Output Current Junction Temperature Electrical Characteristics Parameter Input Offset Voltage ±10V Input Bias Current V− Input Offset Current V− ...

Page 3

Although the output and supply leads are resistant to electrostatic discharges from handling, the input leads are not. The part should be treated accordingly. Output-Transistor Ratings (guaranteed) Safe Area Pulse Thermal Resistance Typical Performance Characteristics Pulse Power Limit 8704 Version ...

Page 4

Peak Output Current Large Signal Response Large Signal Gain www.national.com 870436 870438 870440 4 8704 Version 7 Revision 4 Print Date/Time: 2008/09/16 12:48:40 Output Saturation Voltage 870437 Follower Pulse Response 870439 Thermal Response 870441 ...

Page 5

Total Harmonic Distortion 870442 Output Impedance 870444 Input Bias Current 870446 8704 Version 7 Revision 4 Frequency Response Power Supply Rejection Input Noise Voltage 5 Print Date/Time: 2008/09/16 12:48:40 870443 870445 870447 www.national.com ...

Page 6

Common Mode Rejection Supply Current Application Information GENERAL Twenty five years ago the operational amplifier was a spe- cialized design tool used primarily for analog computation. However, the availability of low cost IC op amps in the late 1960's prompted ...

Page 7

The current in the supply leads is a rectified component of the load current. If adequate bypassing is not provided, this dis- torted signal can be fed back into internal circuitry. Low dis- tortion at high frequencies requires that the ...

Page 8

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 appropriate ...

Page 9

This connection allows increased output capability without requiring a separate control amplifier. The output buffer, A provides load current through R equal to that supplied by the 5 main amplifier through R . Again, more output buffers can ...

Page 10

Discrete transistors can be used to increase output drive to ±70V at ±10A as shown above. With proper thermal design, OPERATIONAL POWER SUPPLY Note: Supply voltages for the LM318s are ±15V External current limit can be provided for a power ...

Page 11

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 ...

Page 12

AUDIO AMPLIFIERS A power amplifier suitable for use in high-quality audio equip- ment is shown above. Harmonic distortion is about 0.01- percent. Intermodulation distortion (60 Hz/7 kHz, 4:1) mea- sured 0.015-percent. Transient response and saturation recovery are clean, and the ...

Page 13

VOLTAGE REGULATOR DISSIPATION The pass transistor dissipation of a voltage regulator is easily determined in the operating mode. Maximum continuous dis- sipation occurs with high line voltage and maximum load current. As discussed earlier, ripple voltage can be averaged if ...

Page 14

Input offset current: The absolute value of the difference in the two input currents with the output voltage and current at zero. Common-mode rejection: The ratio of the input voltage range to the change in offset voltage between the extremes. ...

Page 15

... Physical Dimensions inches (millimeters) unless otherwise noted 8704 Version 7 Revision 4 4-Lead TO-3 Steel Package (K) Order Number LM12CLK NS Package Number K04A 15 Print Date/Time: 2008/09/16 12:48:40 www.national.com ...

Page 16

... For more National Semiconductor product information and proven design tools, visit the following Web sites at: Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock Conditioners www.national.com/timing Data Converters www.national.com/adc Displays www.national.com/displays Ethernet www.national.com/ethernet Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www ...

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