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SGSC34119 Datasheet(PDF) 5 Page - SeCoS Halbleitertechnologie GmbH |
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SGSC34119 Datasheet(HTML) 5 Page - SeCoS Halbleitertechnologie GmbH |
5 / 9 page Elektronische Bauelemente SGSC34119 Low Power Audio Amplifier 17-Dec-2009 Rev. A Page 5 of 9 POWER DISSIPATION Figures 8 to 10 indicate the device dissipation (within the IC) for various combinations of VCC, RL, and load power. The maximum power which can safely be dissipated within the SGSC34119 is found from the following equation: PD = (140°C -T A)/ θ JA where TA is the ambient temperature; and θ JA is the package thermal resistance (100°C /W for th e standard DIP package.) The power dissipated within the SGSC34119, in a given application, is found from the following equation: PD = (VCC x ICC) + (IRMS x VCC) – (RL x IRMS 2) where I CC is obtained from Figure 19; and IRMS is the RMS current at the 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 |
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