LM675T/NOPB National Semiconductor, LM675T/NOPB Datasheet - Page 7

• Manufacturer Part Number: LM675T/NOPB
• Description: IC OP AMP POWER TO-220-5
• Manufacturer: National Semiconductor

Specifications of LM675T/NOPB

• Amplifier Type: Power
• Number Of Circuits: 1
• Slew Rate: 8 V/µs
• Gain Bandwidth Product: 5.5MHz
• Current - Input Bias: 200nA
• Voltage - Input Offset: 1000µV
• Current - Supply: 18mA
• Current - Output / Channel: 4A
• Voltage - Supply, Single/dual (±): 10 V ~ 60 V, ±5 V ~ 30 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Through Hole
• Package / Case: TO-220-5 (Bent and Staggered Leads)
• Bandwidth: 5.5 MHz
• Common Mode Rejection Ratio: 90
• Current, Input Bias: 0.2 μA
• Current, Input Offset: 50 nA
• Current, Output: 4000 mA
• Current, Supply: 18 mA
• Number Of Amplifiers: Single
• Package Type: TO220-5
• Power Dissipation: 30 W
• Temperature, Operating, Range: 0 to +70 °C
• Voltage, Gain: 90 dB
• Voltage, Input: 10 to 60 V
• Voltage, Noise: 16 nV/sqrt Hz
• Voltage, Offset: 1 mV
• Voltage, Output, High: 21 V
• Voltage, Output, Low: -21 V
• Voltage, Supply: ±25 V
• Number Of Channels: 1
• Voltage Gain Db: 90 dB
• Common Mode Rejection Ratio (min): 70 dB
• Input Offset Voltage: 10 mV at +/- 25 V
• Operating Supply Voltage: 18 V, 24 V, 28 V
• Supply Current: 50 mA at +/- 25 V
• Maximum Power Dissipation: 30000 mW
• Maximum Operating Temperature: + 70 C
• Maximum Dual Supply Voltage: +/- 30 V
• Minimum Operating Temperature: 0 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Output Type: -
• -3db Bandwidth: -
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device
• Other names: *LM675T; *LM675T/NOPB; LM675; LM675T

Application Hints
1.6˚C/W lubricated and 3.4˚C/W dry. For this example, we
assume a lubricated mica insulator between the LM675 and
the heat sink. The heat sink thermal resistance must then be
less than
This is a rather large heat sink and may not be practical in
some applications. If a smaller heat sink is required for
reasons of size or cost, there are two alternatives. The
maximum ambient operating temperature can be restricted
to 50˚C (122˚F), resulting in a 1.6˚C/W heat sink, or the heat
sink can be isolated from the chassis so the mica washer is
not needed. This will change the required heat sink to a
1.2˚C/W unit if the case-to-heat-sink interface is lubricated.
Typical Applications
4.2˚C/W − 2˚C/W − 1.6˚C/W = 0.6˚C/W.
(Continued)
Non-Inverting Unity Gain Operation
Inverting Unity Gain Operation
7
The thermal requirements can become more difficult when
an amplifier is driving a reactive load. For a given magnitude
of load impedance, a higher degree of reactance will cause
a higher level of power dissipation within the amplifier. As a
general rule, the power dissipation of an amplifier driving a
60˚ reactive load will be roughly that of the same amplifier
driving the resistive part of that load. For example, some
reactive loads may at some frequency have an impedance
with a magnitude of 8Ω and a phase angle of 60˚. The real
part of this load will then be 8Ω x cos 60˚ or 4Ω, and the
amplifier power dissipation will roughly follow the curve of
power dissipation with a 4Ω load.
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