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3.2.7 Boost and Channel Gain
The channel gain section of the PPC3 GUI provides detailed settings for the integrated boost in TAS2574. Each
of the controls are described in the following paragraphs.
Amplifier level is the gain of the amplifier, up to 16dBV analog gain and beyond that some digital gain can be
applied. 0dBV corresponds to 1Vrms.
Max boost voltage is one of the parameters used by the Class-H boost controller, and defines the maximum
voltage the boost can step-up.
Peak current limit can be used to select the maximum current flowing through the boost inductor from VBAT
supply into SW pin. This can be used when power requirement is lower and a smaller inductor is being used in
the application. Similarly the boost soft start current limit is adjustable from no limit and up to 2.4A. One more
setting related to the boost inductor is the inductance range, this is set to 1uH by default as this is the value
included on the EVM; make sure to adjust this value if using a different inductance value on the end application.
Boost timing related configurations are included in the power-up step time, delay and boost release timer. Delay
parameter sets the amount of samples the boost controllers looks ahead in the audio signal to adjust the boost
level. Release timer sets the amount of samples required for the boost to reduce the level after the input signal
reduces. Finally the power-up time defines how fast the boost level keeps increasing when input signal does
as well. Delay and Boost release timer are automatically calculated based on other parameters such as peak
current limit.
PVDD Max and max POUT define limits for the boost in terms of current and voltage during boost operation.
These parameters along with peaker current limit are used to calculate the boost timing settings.
All the mentioned settings are used for the internal boost controller, which can be configured as Class-H or
Class-G using the Boost Mode control; further detail on these two power modes is covered on
document. In addition to all that, the device can be configured to set the boost to be always on or always off,
as well as fully disable the boost if higher power is not part of the use case, reducing in turn the device power
consumption.
SLAU896 – JULY 2023
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Figure 3-13. Playback and PCM PPC3 Configuration
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