TAS2553_15 datasheet(43/58 Pages) TI

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TAS2553

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SLAS978B – SEPTEMBER 2013 – REVISED FEBRUARY 2014

Typical Applications (continued)

Table 11. Recommended External Components (continued)

COMPONENT

DESCRIPTION

SPECIFICATION

MIN

TYP

MAX

UNIT

Boost Converter Output Capacitor

Type

X5R

Capacitance, 20% Tolerance

µF

Rated Voltage

Capacitance at 7.5 V

µF

derating

C3, C4

EMI Filter Capacitors (optional, must

Capacitance

use L2, L3 if C3, C4 used)

8.2.1.1 Design Requirements

Table 12. Design Parameters

DESIGN PARAMETER

EXAMPLE VALUE

Audio Input

Digital Audio, I2S

Current and Voltage Data Stream

Digital Audio, I2S

Mono or Stereo Configuration

Mono

Max Output Power at 1% THD+N

2.8

8.2.1.2 Detailed Design Procedure

8.2.1.2.1

Audio Input/Output

The choice of digital or analog audio input is driven by system specific considerations. However, since a digital

audio interface will typically be used to send current and voltage data from the TAS2553 to a system processor,

using a bidirectional I2S interface is likely to be the best choice.

If a digital audio input is used, the analog inputs, IN+ and IN-, should be shorted together, and not tied to ground.

8.2.1.2.2

Mono/Stereo Configuration

In this application, the device is assumed to be operating in mono mode. See General I2C Operation for

information on changing the I2C address of the TAS2553 to support stereo operation. Mono or stereo

configuration does not impact the device performance.

8.2.1.2.3

Boost Converter Passive Devices

The boost converter requires three passive devices that are labeled L1, C1 and C2 in Figure 51 and whose

specifications are provided in Table 11. These specifications are based on the design of TAS2553 and are

necessary to meet the performance targets of the device. In particular, L1 should not be allowed to enter in the

current saturation region.

Specifically, the product of L1 and C2 (derated value at 8.5 V) has to be greater than 10e-12 for boost stability

after accounting worst case variation of L1 and C2. To satisfy sufficient energy transfer, L1 needs to be > 2 µH at

the boost switching frequency (~1.75 MHz). Minimum C2 (derated value at 8.5 V) should be > 4 µF for Class-D

power delivery specification. The saturation current for L1 should be > ILIM to deliver Class-D peak power.

8.2.1.2.4

EMI Passive Devices

The TAS2553 supports edge-rate control to minimize EMI, but the system designer may want to include passive

devices on the Class-D output devices. These passive devices that are labeled L2, L3, C3 and C4 in Figure 51

and their recommended specifications are provided in Table 11. If C3 and C4 are used, they must be placed

after L2 and L3 respectively to maintain the stability of the output stage.

8.2.1.2.5

Miscellaneous Passive Devices

•

VREG Capacitor: Needs to be 10 nF to meet boost and class-D power delivery and efficiency specs.

•

BIAS Capacitor: Needs to be 1 µF to meet PSSR and noise performance.

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