TAS2120 datasheet(41/113 Pages) TI2

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Table 6-33. Boost Max Regulation Voltage

(continued)

VBOOST_MAX_CTRL[7:0]

BOOST VOLTAGE (V)

...

…..steps of 66mV per LSB step

…...

0xA7

11.02 V

...

…..steps of 66mV per LSB step

…...

0xE3

14.98 V (default)

0xE4

15.05 V

0xE5

15.11V

0xE6 - 0xFF

Reserved

At light loads (eg. near zero cross of sine waves), the boost automatically enters PFM mode to improve the

system efficiency. When the Boost is running in PFM mode, the minimum pulse frequency can be adjusted using

BST_MIN_FREQ_SEL. Setting a higher PFM frequency will ensure the Boost frequency is always above the set

threshold at the cost of increasing the system power consumption.

Table 6-34. Active Mode PFM Lower Frequency Limit

BST_MIN_FREQ_SEL[1:0]

LOWER LIMIT

No lower limit (default)

25 kHz

50 kHz

RESERVED

The peak current drawn by the boost is controlled using BST_ILIM[23:0] register and it limits the current drawn

from the VBAT supply. This setting allows flexibility in the inductor selection for various saturation currents.

The system should always use inductors which have minimum saturation current (ISAT) atleast 5% higher

than programmed BST_ILIM setting. The Boost circuit can go unstable if the inductor's ISAT is lower than the

BST_ILIM setting. The current limit can be adjusted in 39.1 mA steps with a range from 1.5A to 5.1A using PPC3

Software.

The change in boost configurations like BST_ILIM, VBOOST_MAX_CTRL etc requires re-tuning of device

parameters such as CLASSH_TUNING_xx[23:0] registers to achieve best performance while ensuring no

functionality failures. This configuration should be changed using PPC3 tool to enable automatic reconfiguration

of all the associated device parameters.

For multiple channel systems, the boost phase can be shifted to ensure each device will draw peak current

from the battery at different instance of times and enable lower instantaneous peak current from the battery.

The boost syncing among multiple devices is enabled using BOOST_PHASE_SYNC_EN. The individual

device boost phase can be automatically configured to different values using the I2C target address device

detected by using BOOST_PHASE_FROM_ADDRESS_PIN register, or it can be manually configured using

BOOST_PHASE register. The Boost phase shift is done by each device using the FSYNC pulse to synchronize

each device and all the devices which require the Boost phase synchronization should be connected to same

FSYNC from the host in the system.

Table 6-35. Boost Sync

BOOST_PHASE_SYNC_EN

Status

Disabled

Enabled(default)

www.ti.com

TAS2120

SLASFC6A – AUGUST 2024 – REVISED AUGUST 2025

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