TAS2781RYYR datasheet(30/90 Pages) TI2

30 / 90 page

• Optional 8 steps 384 kHz PWM format or 16 steps 192 kHz PWM format Hybrid-Pro control waveform for

external DC-DC converter.

• Configurable maximum 4 ms look-ahead audio signal delay buffer, which provides capability to fit various

applications systems' DC-DC bandwidth and power supply coupling capacitance.

• Maximum 8 ms programmable audio signal peak hold to optimize power supply voltage rail transition from

large audio input to small level, useful to avoid clipping distortions.

• Hybrid-Pro automatically adjusts audio signal trigger level and each step level. Fine tune available to achieve

the balance between efficiency and envelope tracking speed.

When enabled, the controller generates at PWM_CTRL pin a signal with a duty cycle proportional to the peak

voltage on the speaker. Using an external RC filter the signal is converted to an analog voltage and can be used

to control boost converters with feedback input.

The figure below shows how the PWM_CTRL pin can be connected to the external boost control RC network.

Figure 8-7. PWM_CTRL Pin and External Components

By default, the PWM_CTRL pin has an open drain configuration which allows an easy implementation of a

multi-channel control loop using only one RC circuitry as shown in figure below.

Figure 8-8. Multi - Channel Configuration using PWM_CTRL Pin

When only one device is controlling the boost converter it is recommended to set the PWM_CTRL[6] bit to low.

The PWM_CTRL pin will change configuration to a push-pull and no pull-up resistor is required.

TAS2781

SLOSE86B – JULY 2022 – REVISED JULY 2023

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TAS2781RYYR датащи(PDF) 30 Page - Texas Instruments