4.3.1 Final Temperature

Thermal foldback is able to maintain the device below 132°C successfully, by lowering the gain. Figure 6 shows the temperature monitor at 105°C.

Figure 7. Temperature Monitor - Thermal Foldback

The full-scale signal played at ambient temperature keeps playing on the amplifier. Figure 5 shows the comparison of the output at initial temperature and at final temperature. Initial temperature shows an amplitude of 11.22 Vpp while final temperature shows an amplitude of 8.42 Vpp, this is an attenuation of around -2.5 dB, close to the expected attenuation based on the thermal foldback settings.

Figure 8. Output Waveforms - Thermal Foldback