Datasheet

LM1875

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SNAS524A –MAY 2004–REVISED MAY 2004

NOTE

When using a single supply, maximum transfer of heat away from the LM1875 can be

achieved by mounting the device directly to the heat sink (tab is at ground potential); this

avoids the use of a mica or other type insulator.

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 (usually

considered to be a worst-case loudspeaker load) will be roughly that of the same amplifier driving the resistive

part of that load. For example, a loudspeaker 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 4Ω, and the amplifier power dissipation will

roughly follow the curve of power dissipation with a 4Ω load.

Component Layouts

Figure 14. Split Supply

Product Folder Links: LM1875