TS34119

Low Power Audio Amplifier

6/13

Version: A07

Design Guideline

POWER DISSIPATION

Figure 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 TS34119 is found from the following equation:

PD= (140oC - Ta) / Өja

Where Ta is the ambient temperature; and Өja is the package thermal resistance (100

package, and 180

application, it is found from the following equation: PD= (VCC × ICC) + (IRMS × VCC) - (RL × IRMS2)

Where ICC is obtained from Figure 15; and IRMS is the RMS current at the load; and RL is load resistance. Figure 8

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

range for the TS34119. The operating range is further defined in terms of allowable load power in Figure 14 for loads

of 8Ω, 16Ω and 32Ω. 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

TS34119. The right (descending) portion of each curve is defined by the maximum internal power dissipation of the IC

at 25

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

Electrical Characteristics Curve

Figure 1. Turn-On Time vs. C2, C2 at Power-On

Figure 2. Amplifier #1 Open Loop Gain and Phase

Figure 3. Differential Gain vs. Frequency

Figure 4. PSRR vs. Frequency (C2=10uF)