7.3.4 Spread Spectrum and De-Phase Control

The TPA3139D2 device has built-in spread spectrum control of the oscillator frequency and de-phase of the

PWM outputs to improve EMI performance. The spread spectrum scheme is internally fixed and is always turned

on.

De-phase inverts the phase of the output PWM such that the idle output PWM waveforms of the two audio

channels are inverted. De-phase does not affect the audio signal, or its polarity. De-phase only works with BD

mode, it is auto-disabled in 1SPW mode.

7.3.5 GVDD Supply

The GVDD Supply is used to power the gates of the output full-bridge transistors. Add a 1-μF capacitor to

ground at this pin.

7.3.6 DC Detect

The TPA3139D2 device integrates a circuitry which protects the speakers from DC current that might occur due

to defective capacitors on the input or shorts on the printed circuit board at the inputs. A DC detect fault is

reported on the SD/ FAULT pin as a low state. The DC Detect fault also causes the amplifier to shutdown by

changing the state of the outputs to Hi-Z.

A DC Detect Fault is issued when the output DC voltage sustain for more than 800 msec at the same polarity.

This feature protects the speaker from large DC currents or AC currents less than 1 Hz. To avoid nuisance faults

due to the DC detect circuit, hold the SD/ FAULT pin low at power-up until the signals at the inputs are stable.

Also, take care to match the impedance seen at the positive and negative inputs to avoid nuisance DC detect

faults.

7.3.7 PBTL Select

The TPA3139D2 device offers the feature of Parallel BTL operation with two outputs of each channel connected

directly. Connecting LINP and LINN directly to Ground (without capacitors) sets the device in Mono Mode during

power up. Connect the OUTPR and OUTNR together for the positive speaker terminal and OUTNL and OUTPL

together for the negative speaker terminal. Analog input signal is applied to INPR and INNR. For an example of

the PBTL connection, see the schematic in the Section 8.2 section.

7.3.8 Short-Circuit Protection and Automatic Recovery Feature

The TPA3139D2 features over-current conditions against the output stage short-circuit conditions. The short-

circuit protection fault is reported on the SD/ FAULT pin as a low state. The amplifier outputs are switched to a

Hi-Z state when the short circuit protection latch is triggered .

The device recovers automatically once the over-current condition has been removed.

7.3.9 Over-Temperature Protection (OTP)

Thermal protection on the TPA3139D2 device prevents damage to the device when the internal die temperature

exceeds 150°C. This triggering point has a ±15°C tolerance from device to device. Once the die temperature

exceeds the thermal triggering point, the device is switched to the shutdown state and the outputs are disabled.

Thermal protection faults are reported on the SD/ FAULT pin.

The device recovers automatically once the over temperature condition has been removed.

7.3.10 Over-Voltage Protection (OVP)

The TPA3139D2 device monitors the voltage on PVCC voltage threshold. When the voltage on PVCCL pin and

PVCCR pin exceeds the over-voltage threshold (15.8 V typ), the OVP circuit puts the device into shutdown

mode.

The device recovers automatically once the over-voltage condition has been removed.

TPA3139D2

SLOS810A – OCTOBER 2019 – REVISED AUGUST 2020

www.ti.com

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