TPA3116D2-Q1, TPA3118D2-Q1

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SLOS862A – JULY 2015 – REVISED AUGUST 2015

Table 4. Power Limit Example

R to GND

R to GVDD

24 V

GVDD

Short

Open

17.9

24 V

3.3

45 k

Ω

51 k

Ω

12.67

24 V

2.25

24 k

Ω

51 k

Ω

9

12 V

GVDD

Short

Open

10.33

12 V

2.25

24 k

Ω

51 k

Ω

9

12 V

1.5

18 k

Ω

68 k

Ω

6.3

(1)

7.3.5 GVDD Supply

The GVDD supply is used to power the gates of the output full-bridge transistors. The GVDD supply can also be

used to supply the PLIMIT and GAIN/SLV voltage dividers. Decouple GVDD with an X5R ceramic 1-µF capacitor

to GND. The GVDD supply is not intended to be used for external supply. It is recommended to limit the current

consumption by using resistor voltage dividers of 100 k

Ω or more for GAIN/SLV and PLIMIT.

7.3.6 BSPx and BSNx Capacitors

The full H-bridge output stages use only NMOS transistors. Therefore, to turn on correctly they require bootstrap

capacitors for the high side of each output. A 220-nF ceramic capacitor of quality X5R or better, rated for at least

16 V, must be connected from each output to its corresponding bootstrap input. (See the application circuit

diagram in Figure 19.) The bootstrap capacitors connected between the BSxx pins and their corresponding

outputs function as a floating power supply for the high-side N-channel power MOSFET gate-drive circuitry.

During each high-side switching cycle, the bootstrap capacitors hold the gate-to-source voltage high enough to

keep the high-side MOSFETs turned on.

7.3.7 Differential Inputs

The differential input stage of the amplifier cancels any noise that appears on both input lines of the channel. To

use the TPA311xD2-Q1 family with a differential source, connect the positive lead of the audio source to the

RINP or LINP input and the negative lead from the audio source to the RINN or LINN input. To use the

TPA311xD2-Q1 family with a single-ended source, ac-ground the negative input through a capacitor equal in

value to the input capacitor on the positive input and apply the audio source to either input. In a single-ended

input application, the unused input should be ac-grounded at the audio source instead of at the device input for

best noise performance. For good transient performance, the impedance seen at each of the two differential

inputs should be the same.

The impedance seen at the inputs should be limited to an RC time constant of 1 ms or less if possible. This is to

allow the input dc-blocking capacitors to become completely charged during the 10-ms power-up time. If the

input capacitors are not allowed to completely charge, there is some additional sensitivity to component matching

which can result in a pop if the input components are not well matched.

7.3.8 Device Protection System

The TPA311xD2-Q1 family contains a complete set of protection circuits to make system design efficient as well

as to protect the device against any kind of permanent failures due to short circuits, overload, overtemperature,

and undervoltage. The FAULT pin signals if an error is detected according to Table 5:

Table 5. Fault Reporting

TRIGGERING CONDITION

LATCHED OR SELF-

FAULT

FAULT

ACTION

(typical value)

CLEARING

Overcurrent

Output short or short to PVCC or GND

Low

Output high impedance

Latched

Overtemperature

Low

Output high impedance

Latched

Too-high dc offset

DC output voltage

Low

Output high impedance

Latched

Undervoltage on

–

Output high impedance

Self-clearing

PVCC

Overvoltage on PVCC

–

Output high impedance

Self-clearing

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