I will drive a TAS5631b digital input by a TPA3110. The TAS DS gives 352khz to 500khz while the TPA may run from 250khz.
The bootstrap capacitor of 33nF, the DS of TAS states that it is suitable for 300khz-400khz range. The simple conclusion is to increase the capacitor that I would like to be 100nF, the TPA has 220nF.
A question was asked about this matter on TI's e2e forum and bellow is the answer.
Hello Kato-san,
I apologize for the delay. I was out for holiday.
Generally it is not recommended to change the bootstrap capacitor value. The TAS5624A was designed and tested with 33nF capacitors. This is standard for our devices. Channing this value may cause the part to not function properly at very high and very low PWM modulation levels.
Also, the bootstrap capacitor will have little impact on audio quality. Typically the loop filter, loop gain, and architecture of the amplifier determines overall performance level.
If your customer is looking fro better performance, I would recommend the TPA32xx family of device.
Best Regards,
Matt
Is this reasoning correct?
If the capacitor is higher, it will discharge less and it will need not more time to recharge.
I learned to calculate the bootstrap capacitor value from DS of LM5108 which is the following.