TAS5760M-Q1: TAS5760 output switching

Hi Kim,

See my comments below.
1. What does meaning of "Output switching rate of the Speaker Amplifier"? output switching frequency?
Andy: It seems like a general question about how a Class-D amplifier works. See the wiki below en.wikipedia.org/.../Class-D_amplifier

2. What is unit of Output switching rate? Hz? kHz?
Andy: Usually kHz (eg. 384kHz and 768kHz).

3. What is advantage of high output switching rate? can make lower Power disspation?
Andy: The switching frequency selection affects three important operating characteristics of the device. These are the power dissipation in the device, the power dissipation in the inductor, and the target output filter for the application.

Higher switching frequencies typically result in slightly higher power dissipation in the device and lower dissipation in the inductor in the system, due to decreased ripple current through the inductor and increased charging and discharging current in device and parasitic capacitances. Switching at the higher of the two available switching frequencies will result in lower overall dissipation in the system and lower operating temperature of the inductors. However, the thermally limited power output of the device may be decreased in this situation, because some of the device thermal headroom will be absorbed by the higher switching frequency. Conversely inductor heating can be reduced by using the higher switching frequency in order to reduce the ripple current.

Another advantage of increasing the switching frequency is that the higher frequency carrier signal can be filtered by an L-C filter with a higher corner frequency, leading to physically smaller components.

4. What kind problem can be occurred if customer change LRCK from 16*LRCK to 20*LRCK? due to EMC issue, they change the factor and solve the issue. However, they want to know what kind of side effect can be occurred?
Andy: See the comments above.

Andy