2

L

P

L

S

OUT

L

R

V

R + 2

R

P

=

for unclipped power

2

R

æ

ö

æ

ö

´

ç

÷

ç

÷

ç

÷

´

è

ø

è

ø

´

TPA3116D2

TPA3118D2

TPA3130D2

www.ti.com

SLOS708B – APRIL 2012 – REVISED MAY 2012

(2)

Where:

Table 3. POWER LIMIT Example

R to GND

R to GVDD

24 V

GVDD

Short

Open

17.90

24 V

3.3

45 k

Ω

51 k

Ω

12.67

24 V

2.25

24 k

Ω

51 k

Ω

9.00

12 V

GVDD

Short

Open

10.33

12 V

2.25

24 k

Ω

51 k

Ω

9.00

12 V

1.5

18 k

Ω

68 k

Ω

6.30

(1)

GVDD SUPPLY

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

the PLIMIT and GAIN/SLV voltage dividers. Decouple GVDD with a 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 for GAIN/SLV and PLIMIT of 100 k

Ω or more.

BSPx AND BSNx CAPACITORS

The full H-bridge output stages use only NMOS transistors. Therefore, they require bootstrap capacitors for the

high side of each output to turn on correctly. 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 27.) The bootstrap capacitors connected between the BSxx pins and corresponding output

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.

DIFFERENTIAL INPUTS

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

use the TPA31xxD2 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 TPA31xxD2 family

with a single-ended source, ac ground the negative input through a capacitor equal in value to the input capacitor

on positive 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 will be some additional sensitivity to component matching

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

Copyright © 2012, Texas Instruments Incorporated

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