TAS5815PWPR datasheet(39/123 Pages) TI

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portion of the output filter. Doing so does require two additional inductors, but allows smaller, less expensive

inductors to be used because the current is divided between the two inductors. The process is called Post-Filter

PBTL. On the input side of the TAS5815 device, the input signal to the PBTL amplifier is left frame of I2S or TDM

data.

7.4.3 Low EMI Modes

TAS5815 employs several modes to minimize EMI during playing audio, and they can be used based on

different applications.

7.4.3.1 Minimize EMI with Spread Spectrum

This device supports spread spectrum with triangle mode. Spread spectrum is used to minimize the EMI noise.

User needs to configure register RAMP_SS_CTRL0 (0x6B) to Enable triangle mode and enable spread

spectrum. Select spread spectrum frequency and range with RAMP_SS_CTRL1 (0x6C). For 384 kHz FSW

which configured by DEVICE_CTRL1 (0x02), the spread spectrum frequency and range are described in Table

7-3.

Table 7-3. Spectrum frequency and range

SS_TRI_CTRL[3:0]

Triangle Freq

24k

48k

Spread Spectrum Range

10%

20%

25%

10%

20%

25%

• User Application example 1:

Central Switching Frequency is 384kHz, Triangle Frequency is 24kHz, take I2C device address 0x58 as an

example:

w A8 6b 01 //Enable Spread Spectrum

w A8 6c 03 //RAMP_SS_CTRL[3:0]0011, Triangle Frequency = 24kHz, Spread Spectrum Range should be 25%

(336 kHz ~ 432 kHz)

• User Application example 2:

Central Switching Frequency is 768 kHz, Triangle Frequency is 24 kHz, take I2C device address 0x58 as an

example:

w A8 6b 01 //Enable Spread Spectrum

w A8 6c 0f //RAMP_SS_CTRL[3:0]1111, Triangle Frequency = 24 kHz, Spread Spectrum Range should be 20%

(700 kHz ~ 860 kHz)

7.4.3.2 Minimize EMI with channel to channel phase shift

This device support channel to channel 180 degree PWM phase shift to minimize the EMI. Bit 0 of ANA_CTRL

Note

Only BD mode supports channel to channel 180 degree PWM phase shift.

7.4.3.3 Minimize EMI with Multi-Devices PWM Phase Synchronization

This device support up to 4 phases selection for multiple device application systems. For example, when a

system integrates four TAS5815 devices, the user can select phase 0, 1, 2, or 3 for each device by register

RAMP_PHASE_CTRL (0x6A), which means there is a 45 degree phase shift between each device to minimize

the EMI.

Recommend to do the Phase Synchronization with I2S clock during the Startup Phase:

1. Halt I2S clock.

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TAS5815

SLOSEA8 – DECEMBER 2024

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