Other Parts Discussed in Thread: TPA2038D1
Hi team,
This is Alix of Beijing auto team. My customer Foton is considering use our TPA2038 to driver their speaker in their reversing alarm system.
However, though it is a AIN amplifier, the input signal of TPA2038 EVM is differential PWM signals (without filter) from output of class D integrated in ISD2100 . As
is shown bellow:
As to figure above, SPK+ and SPK- are directly connected to input pins of TPA2038 EVM. SPK+ and SPK- are PWM signals varying between 0-3.6V while Vsupply of TPA2038 is 5V. The aim is to amplify the signal up to 3W@3.1ohm;
On my side, this is equivalent to using a class D to drive another class D. Audio signal is modulated in PWM(SPK+ and SPK-), if we use a filter to filter the PWM out and use analog signal as input signal of TPA2038? Do it work? without considering the quality of the sound conditions, such a program feasible? How about TPA6211?
Problem:
At present, the test indicates that TPA2038 cannot amplify the signal more than 0.4W. In addition, 6dB or 12dB gain setting does not work.
Do you have any ideas about this problem? Thanks ahead!