Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsLinear ICsLinear IC - Audio amplifier 1-channel (mono) Class D HTSSOP 28

INP

INN

SDSD

FaultFault

PLIMITPLIMIT

PVCC 8to26V

1uF

OUTN

FERRITE

BEAD

FILTER

OUTP

10W

8Ω

OUTN

FERRITE

BEAD

FILTER

FERRITE

BEAD

FILTER

OUTP

10W

8Ω

OUT+

OUT

Audio

Source

TPA3111D1

GAIN0

GAIN1GAIN1

TPA3111D1

www.ti.com

SLOS618E –AUGUST 2009–REVISED AUGUST 2012

10-W FILTER-FREE MONO CLASS-D AUDIO POWER AMPLIFIER with SPEAKER GUARD™

Check for Samples: TPA3111D1

FEATURES

DESCRIPTION

• 10-W into an 8-Ω Load at 10% THD+N From a

The TPA3111D1 is a 10-W efficient, Class-D audio

12-V Supply

power amplifier for driving a bridge tied speaker.

• 7-W into an 4-Ω Load at 10% THD+N From a 8-

Advanced EMI Suppresion Technology enables the

V Supply

use of inexpensive ferrite bead filters at the outputs

• 94% Efficient Class-D Operation into 8-Ω Load

while meeting EMC requirements. SpeakerGuard™

speaker protection system includes an adjustable

Eliminates Need for Heat Sinks

power limiter and a DC detection circuit. The

• Wide Supply Voltage Range Allows Operation

adjustable power limiter allows the user to set a

from 8 to 26 V

"virtual" voltage rail lower than the chip supply to limit

• Filter-Free Operation

the amount of current through the speaker. The DC

detect circuit measures the frequency and amplitude

• SpeakerGuard™ Speaker Protection Includes

of the PWM signal and shuts off the output stage if

Adjustable Power Limiter plus DC Protection

the input capacitors are damaged or shorts exist on

• Flow Through Pin Out Facilitates Easy Board

the inputs.

Layout

The TPA3111D1 can drive a mono speaker as low as

• Robust Pin-to-Pin Short Circuit Protection and

4Ω. The high efficiency of the TPA3111D1, > 90%,

Thermal Protection with Auto-Recovery Option

eliminates the need for an external heat sink when

• Excellent THD+N/ Pop Free Performance

playing music.

• Four Selectable, Fixed Gain Settings

The outputs are fully protected against shorts to

• Differential Inputs

GND, V

, and output-to-output. The short-circuit

protection and thermal protection includes an auto-

APPLICATIONS

recovery feature.

• Televisions

• Monitor/Laptop

• Consumer Audio Equipment

Figure 1. Simplified Application Diagram

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2SpeakerGuard is a trademark of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (27 pages)

PAGE 1
TPA3111D1 www.ti.
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TPA3111D1 SLOS618E – AUGUST 2009 – REVISED AUGUST 2012 www.ti.com These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. ABSOLUTE MAXIMUM RATINGS over operating free-air temperature range (unless otherwise noted) (1) UNIT VCC Supply voltage AVCC, PVCC –0.3 V to 30 V SD, FAULT,GAIN0, GAIN1, AVCC (Pin 14) VI Interface pin voltage (2) PLIMIT –0.
PAGE 3
TPA3111D1 www.ti.com SLOS618E – AUGUST 2009 – REVISED AUGUST 2012 RECOMMENDED OPERATING CONDITIONS over operating free-air temperature range (unless otherwise noted) MIN MAX VCC Supply voltage PARAMETER PVCC, AVCC TEST CONDITIONS 8 26 UNIT VIH High-level input voltage SD, GAIN0, GAIN1 2 VIL Low-level input voltage SD, GAIN0, GAIN1 0.8 VOL Low-level output voltage FAULT, RPULLUP= 100kΩ, VCC=26V 0.
PAGE 4
TPA3111D1 SLOS618E – AUGUST 2009 – REVISED AUGUST 2012 www.ti.com AC CHARACTERISTICS TA = 25°C, VCC = 24 V, RL = 8 Ω (unless otherwise noted) PARAMETER TEST CONDITIONS MIN KSVR Power Supply ripple rejection 200 mVPP ripple from 20 Hz–1 kHz, Gain = 20 dB, Inputs ac-coupled to AGND PO Continuous output power THD+N ≤ 0.
PAGE 5
TPA3111D1 www.ti.com SLOS618E – AUGUST 2009 – REVISED AUGUST 2012 PIN FUNCTIONS PIN NAME SD Pin # 1 I/O DESCRIPTION I Shutdown logic input for audio amp(LOW = outputs Hi-Z, HIGH = outputs enabled). TTL logic levels with compliance to AVCC. O Open drain output used to display short circuit or dc detect fault status. Voltage compliant to AVCC. Short circuit faults can be set to auto-recovery by connecting FAULT pin to SD pin.
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TPA3111D1 SLOS618E – AUGUST 2009 – REVISED AUGUST 2012 www.ti.
PAGE 7
TPA3111D1 www.ti.com SLOS618E – AUGUST 2009 – REVISED AUGUST 2012 TYPICAL CHARACTERISTICS (All Measurements taken at 1 kHz, unless otherwise noted. Measurements were made using the TPA3110D2 EVM which is available at ti.com.) TOTAL HARMONIC DISTORTION vs FREQUENCY TOTAL HARMONIC DISTORTION vs FREQUENCY 10 Gain = 20 dB VCC = 12 V ZL = 8 Ω + 66 µH THD − Total Harmonic Distortion − % THD − Total Harmonic Distortion − % 10 1 0.1 PO = 1 W 0.
PAGE 8
TPA3111D1 SLOS618E – AUGUST 2009 – REVISED AUGUST 2012 www.ti.com TYPICAL CHARACTERISTICS (continued) (All Measurements taken at 1 kHz, unless otherwise noted. Measurements were made using the TPA3110D2 EVM which is available at ti.com.) TOTAL HARMONIC DISTORTION + NOISE vs OUTPUT POWER TOTAL HARMONIC DISTORTION + NOISE vs OUTPUT POWER 10 Gain = 20 dB VCC = 24 V ZL = 8 Ω + 66 µH THD+N − Total Harmonic Distortion + Noise − % THD+N − Total Harmonic Distortion + Noise − % 10 1 f = 1 kHz f = 20 Hz 0.
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TPA3111D1 www.ti.com SLOS618E – AUGUST 2009 – REVISED AUGUST 2012 TYPICAL CHARACTERISTICS (continued) (All Measurements taken at 1 kHz, unless otherwise noted. Measurements were made using the TPA3110D2 EVM which is available at ti.com.) GAIN/PHASE vs FREQUENCY EFFICIENCY vs OUTPUT POWER 40 100 35 50 100 VCC = 12 V 90 Phase 80 30 VCC = 24 V 0 −50 Gain 20 −100 15 −150 CI = 1 µF Gain = 20 dB Filter = Audio Precision AUX-0025 VCC = 12 V VI = 0.
PAGE 10
TPA3111D1 SLOS618E – AUGUST 2009 – REVISED AUGUST 2012 www.ti.com TYPICAL CHARACTERISTICS (continued) (All Measurements taken at 1 kHz, unless otherwise noted. Measurements were made using the TPA3110D2 EVM which is available at ti.com.) SUPPLY CURRENT vs TOTAL OUTPUT POWER SUPPLY RIPPLE REJECTION RATIO vs FREQUENCY 0 1.2 ICC − Supply Current − A 1.0 KSVR − Supply Ripple Rejection Ratio − dB Gain = 20 dB VCC = 12 V ZL = 4 Ω + 33 µH 0.8 0.6 0.4 0.2 0.
PAGE 11
TPA3111D1 www.ti.com SLOS618E – AUGUST 2009 – REVISED AUGUST 2012 SD OPERATION The TPA3111D1 employs a shutdown mode of operation designed to reduce supply current (ICC) to the absolute minimum level during periods of nonuse for power conservation. The SD input terminal should be held high (see specification table for trip point) during normal operation when the amplifier is in use. Pulling SD low causes the outputs to mute and the amplifier to enter a low-current state.
PAGE 12
TPA3111D1 SLOS618E – AUGUST 2009 – REVISED AUGUST 2012 POUT ææ ö ö RL çç ç ÷ ´ VP ÷÷ è RL + 2 ´ RS ø ø =è 2 ´ RL www.ti.com 2 for unclipped power (1) Where: RS is the total series resistance including RDS(on), and any resistance in the output filter. RL is the load resistance. VP is the peak amplitude of the output possible within the supply rail. VP = 4 × PLIMIT voltage if PLIMIT < 4 × VP POUT(10%THD) = 1.25 × POUT(unclipped) Table 2.
PAGE 13
TPA3111D1 www.ti.com SLOS618E – AUGUST 2009 – REVISED AUGUST 2012 SHORT-CIRCUIT PROTECTION AND AUTOMATIC RECOVERY FEATURE TPA3110D2 has protection from over-current conditions caused by a short circuit on the output stage. The short circuit protection fault is reported on the FAULT pin as a low state. The amplifier outputs are switched to a Hi-Z state when the short circuit protection latch is engaged. The latch can be cleared by cycling the SD pin through the low state.
PAGE 14
TPA3111D1 SLOS618E – AUGUST 2009 – REVISED AUGUST 2012 www.ti.com CLASS-D OPERATION This section focuses on the class-D operation of the TPA3111D1. TPA3111D1 Modulation Scheme The TPA3111D1 uses a modulation scheme that allows operation without the classic LC reconstruction filter when the amp is driving an inductive load. Each output is switching from 0 volts to the supply voltage. The OUTP and OUTN are in phase with each other with no input so that there is little or no current in the speaker.
PAGE 15
TPA3111D1 www.ti.com SLOS618E – AUGUST 2009 – REVISED AUGUST 2012 Ferrite Bead Filter Considerations Using the Advanced Emissions Suppression Technology in the TPA3111D1 amplifier it is possible to design a high efficiency Class-D audio amplifier while minimizing interference to surrounding circuits. it is also possible to accomplishthis with only a low-cost ferrite bead filter. In this case it is necessary to carefully select the ferrite bead used in the filter.
PAGE 16
TPA3111D1 SLOS618E – AUGUST 2009 – REVISED AUGUST 2012 www.ti.com When to Use an Output Filter for EMI Suppression The TPA3111D1 has been tested with a simple ferrite bead filter for a variety of applications including long speaker wires up to 125 cm and high power. The TPA3111D1 EVM passes FCC Class B specifications under these conditions using twisted speaker wires. The size and type of ferrite bead can be selected to meet applicaton requirements.
PAGE 17
TPA3111D1 www.ti.com SLOS618E – AUGUST 2009 – REVISED AUGUST 2012 INPUT RESISTANCE Changing the gain setting can vary the input resistance of the amplifier from its smallest value, 9 kΩ ±20%, to the largest value, 60 kΩ ±20%. As a result, if a single capacitor is used in the input high-pass filter, the -3 dB or cutoff frequency may change when changing gain steps. Zf Ci IN Input Signal Zi The -3-dB frequency can be calculated using Equation 2. Use the ZI values given in Table 1.
PAGE 18
TPA3111D1 SLOS618E – AUGUST 2009 – REVISED AUGUST 2012 www.ti.com POWER SUPPLY DECOUPLING, CS The TPA3111D1 is a high-performance CMOS audio amplifier that requires adequate power supply decoupling to ensure that the output total harmonic distortion (THD) is as low as possible. Power supply decoupling also prevents oscillations for long lead lengths between the amplifier and the speaker.
PAGE 19
TPA3111D1 www.ti.com SLOS618E – AUGUST 2009 – REVISED AUGUST 2012 PRINTED-CIRCUIT BOARD (PCB) LAYOUT The TPA3111D1 can be used with a small, inexpensive ferrite bead output filter for most applications. However, since the Class-D switching edges are very fast, it is necessary to take care when planning the layout of the printed circuit board. The following suggestions will help to meet EMC requirements.
PAGE 20
PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
PAGE 22
PACKAGE MATERIALS INFORMATION www.ti.com 23-Jul-2012 TAPE AND REEL INFORMATION *All dimensions are nominal Device TPA3111D1PWPR Package Package Pins Type Drawing SPQ HTSSOP 2000 PWP 28 Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 330.0 16.4 Pack Materials-Page 1 6.9 B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 10.2 1.8 12.0 16.
PAGE 23
PACKAGE MATERIALS INFORMATION www.ti.com 23-Jul-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TPA3111D1PWPR HTSSOP PWP 28 2000 367.0 367.0 38.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46C and to discontinue any product or service per JESD48B. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.