Elektronische Bauelemente

SGSC34119

Low Power Audio Amplifier

17-Dec-2009 Rev. A

Page 5 of 9

POWER DISSIPATION

θ

θ

standard DIP package.)

The power dissipated within the SGSC34119, in a given application, is found from the following equation:

load; and RL is the load resistance.

Figures 8 to 10, along with Figures 11 to 13 (distortion curves), and a peak working load current of 200 mA, define the

operating range for the SGSC34119. The operating range is further defined in terms of allowable load power in Figure

14 for loads of 8.0 , 16

and 32 . The left (ascending) portion of each of the three curves is defined by the power level

at which 10% distortion occurs. The center flat portion of each curve is defined by the maximum output current capability

of the SGSC34119. The right (descending) portion of each curve is defined by the maximum internal power dissipation

of the IC at 25°C. At higher ambient temperatures, the maximum load power must be reduced according to the above

equations. Operating the device beyond the current and junction temperature limits will degrade long term reliability.

LAYOUT CONSIDERATIONS

Normally a snubber is not needed at the output of the SGSC34119, unlike many other audio amplifiers. However, the

PC board layout, stray capacitances, and the manner in which the speaker wires are configured, may dictate otherwise.

Generally, the speaker wires should be twisted tightly, and not more than a few inches in length.

CHARACTERISTICS CURVE