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Texas Instruments TPA3003D2 User Manual
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Texas Instruments TPA3003D2 User Manual

3 w stereo class d audio power amplifier with dc volume control
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3 W STEREO CLASS D AUDIO POWER AMPLIFIER
FEATURES
D
3-W/Ch Into an 8-Ω Load From 12-V Supply
D
Efficient, Class-D Operation Eliminates
Heatsinks and Reduces Power Supply
Requirements
D
32-Step DC Volume Control From −40 dB
to 36 dB
D
Third Generation Modulation Techniques
− Replaces Large LC Filter With Small
Low-Cost Ferrite Bead Filter
D
Thermal and Short-Circuit Protection
APPLICATIONS
D
LCD Monitors and TVs
D
Powered Speakers
SYSTEM CONTROL
Crinn
RINN
Crinp
1 µF
RINP
C2p5
1 µF
Clinp
1 µF
LINP
Clinn
1 µF
LINN
1 µF
VOLUME
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.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
WITH DC VOLUME CONTROL
PVCC
10 µF
10 µF
PVCC
10 nF
10 nF
Cs
Cs
0.1 µF
0.1 µF
Cbs
Cbs
Cs
Cs
SD
RINN
RINP
V2P5
LINP
LINN
TPA3003D2
AVDDREF
VREF
AGND
AGND
VOLUME
REFGND
Cs
Cs
Cbs
Cbs
0.1 µF
0.1 µF
Cs
Cs
10 nF
10 nF
10 µF
10 µF
PVCC
PVCC
www.ti.com
SLOS406A − FEBRUARY 2003 − REVISED MARCH 2003
DESCRIPTION
The TPA3003D2 is a 3-W (per channel) efficient,
Class-D audio amplifier for driving bridged-tied stereo
speakers. The TPA3003D2 can drive stereo speakers
as low as 8 Ω. The high efficiency of the TPA3003D2
eliminates the need for external heatsinks when playing
music.
Stereo speaker volume is controlled with a dc voltage
applied to the volume control terminal offering a range
of gain from –40 dB to 36 dB.
Ccpr
VCLAMPR
1 µF
NC
MUTE
MUTE CONTROL
AVCC
NC
NC
FADE
SYSTEM CONTROL
AVDD
Cvdd
AVDD
Cosc
100 nF
COSC
Rosc
220 pF
ROSC
120 kΩ
AGND
Ccpl
VCLAMPL
1 µF
Copyright  2003, Texas Instruments Incorporated
TPA3003D2
AVCC
Cvcc
Cs
10 µF
0.1 µF
1

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Summary of Contents for Texas Instruments TPA3003D2

  • Page 1 VOLUME REFGND 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. PRODUCTION DATA information is current as of publication date.
  • Page 2 TPA3003D2 SLOS406A − FEBRUARY 2003 − REVISED MARCH 2003 −40°C to 85°C † The PFB package is available taped and reeled. To order a taped and reeled part, add the suffix R to the part number (e.g., TPA3003D2PFBR). 48 47...

  • Page 3: Functional Block Diagram

    Logic V2P5 Ramp Biases Generator & References 5V LDO PVCC VClamp Cint2 Deglitch & Rfdbk2 Modulation Logic Rfdbk2 Cint2 www.ti.com TPA3003D2 VCLAMPR BSRN PVCCR(2) Gate ROUTN(2) Drive PGNDR BSRP PVCCR(2) Gate ROUTP(2) Drive PGNDR Short Circuit Detect Thermal Startup Protection...
  • Page 4 TPA3003D2 SLOS406A − FEBRUARY 2003 − REVISED MARCH 2003 TERMINAL NAME AGND 9, 10, 26 − Analog ground for digital/analog cells in core AV CC − High-voltage analog power supply (8.5 V to 14 V) AV DD 5-V Regulated output AV DD REF 5-V Reference output—provided for connection to adjacent VREF terminal.

  • Page 5: Recommended Operating Conditions

    FADE, V I = 5 V, V CC = 14 V MUTE, SD, FADE, V I = 0 V, V CC = 14 V MUTE, SD, FADE, V I = 0 V, V CC = 14 V www.ti.com TPA3003D2 † −0.3 V to 15 V 0 V to 5.5 V −0.3 V to V...
  • Page 6 TPA3003D2 SLOS406A − FEBRUARY 2003 − REVISED MARCH 2003 dc characteristics, T = 25°C, V PARAMETER Output offset voltage (measured | V OS | differentially) V2P5 (terminal 4) 2.5-V Bias voltage PSRR Power supply rejection ratio I CC Supply quiescent current...
  • Page 7 64.2 − 66.4 68.4 − 70.6 66.4 − 68.6 > 70.6 >68.6 † Tested in production. Remaining steps are specified by design. www.ti.com TPA3003D2 SLOS406A − FEBRUARY 2003 − REVISED MARCH 2003 GAIN OF AMPLIFIER −75 † −40.0 −37.5 −35.0 −32.4...

  • Page 8: Table Of Contents

    TPA3003D2 SLOS406A − FEBRUARY 2003 − REVISED MARCH 2003 Efficiency Output power Output power Quiescent supply current I CC Supply current I Q(sd) Quiescent shutdown supply current Input impedance THD+N THD+N Total harmonic distortion + noise Total harmonic distortion + noise...

  • Page 9: Vs Load Resistance

    R L − Load Resistance − Ω QUIESCENT SUPPLY CURRENT SUPPLY VOLTAGE T A = 25°C V CC − Supply Voltage − V www.ti.com TPA3003D2 V CC = 12 V, THD = 1% V CC = 8.5 V, THD = 1% Figure 2...

  • Page 10: Vs Supply Voltage

    TPA3003D2 SLOS406A − FEBRUARY 2003 − REVISED MARCH 2003 SUPPLY CURRENT OUTPUT POWER (TOTAL) V CC = 12 V, R L = 8 Ω P O − Output Power (Total) − W Figure 5 INPUT IMPEDANCE GAIN −50 −30 −10 Gain −...

  • Page 11: Vs Output Power

    V CC = 12 V, R L = 8 Ω −45 −50 −55 −60 −65 −70 −75 −80 −85 −90 www.ti.com TPA3003D2 OUTPUT POWER f = 20 Hz Figure 10 FREQUENCY 10 k 100 k f − Frequency − Hz Figure 12...

  • Page 12: Typical Characteristics

    TPA3003D2 SLOS406A − FEBRUARY 2003 − REVISED MARCH 2003 CLOSED LOOP RESPONSE Gain Phase −50 −100 −150 V CC = 12 V, Gain = +5.6 dB, −200 R L = 8 Ω −250 10 k f − Frequency − Hz...

  • Page 13: Vs Frequency

    100 k f − Frequency − Hz Figure 18 COMMON-MODE REJECTION RATIO FREQUENCY −60 V CC = 12 V −70 −80 −90 −100 10 k f − Frequency − Hz Figure 20 www.ti.com TPA3003D2 10 k 10 k 20 k...

  • Page 14: Application Information

    TPA3003D2 SLOS406A − FEBRUARY 2003 − REVISED MARCH 2003 SHUTDOWN RIN− 1 µF 1 µF AGND 1 µF 1 µF LIN− 1 µF 50 kΩ AGND Figure 21. Stereo Configuration With Single-Ended Inputs APPLICATION INFORMATION 1 nF 1 nF (Bead) (Bead) 10 µF...
  • Page 15 TPA3003D2 modulation scheme The TPA3003D2 uses a modulation scheme that still has each output switching from 0 to the supply voltage. However, OUTP and OUTN are now in phase with each other with no input. The duty cycle of OUTP is greater than 50% and OUTN is less than 50% for positive output voltages.
  • Page 16 The speaker is both resistive and reactive, whereas an LC filter is almost purely reactive. The TPA3003D2 modulation scheme has very little loss in the load without a filter because the pulses are very short and the change in voltage is V making the ripple current larger.
  • Page 17 Design the TPA3003D2 without the filter if the traces from amplifier to speaker are short (< 1 inch). Powered speakers, where the speaker is in the same enclosure as the amplifier, is a typical application for class-D without a filter.
  • Page 18 The reference voltage of the DAC provides the reference to the internal gain circuitry through the VREF input and any fluctuations in the DAC output voltage will not affect the TPA3003D2 gain. The percentages in the first column of Table 1 should be used for setting the voltages of the DAC when the voltage on the VOLUME terminal is increased.
  • Page 19 4 clock cycles (nominally 67 ms based on a 60 Hz clock) to the next step until the final desired gain is reached. For example, if the TPA3003D2 is currently in the +0.53 dB gain step and the VOLUME pin is adjusted for maximum gain at +36 dB, the time required for the gain to reach +36 dB is 14 steps x 67ms/step = 0.938...
  • Page 20 The gain updates every 4 clock cycles (nominally 67 ms based on a 60 Hz clock) to the next step until the final desired gain is reached. For example, if the TPA3003D2 is currently in the +0.53 dB class-D gain step and the VOLUME pin is adjusted for maximum gain at +36 dB, the time required for the gain to reach 36 dB is 14 steps x 67 ms/step = 0.938 seconds.
  • Page 21 MUTE operation The MUTE pin is an input for controlling the output state of the TPA3003D2. A logic high on this pin disables the outputs. A logic low on this pin enables the outputs. This pin may be used as a quick disable or enable of the outputs without a volume fade.
  • Page 22 TPA3003D2 SLOS406A − FEBRUARY 2003 − REVISED MARCH 2003 internal 2.5-V bias generator capacitor selection The internal 2.5-V bias generator (V2P5) provides the internal bias for the preamplifier stage. The external input capacitors and this internal reference allow the inputs to be biased within the optimal common-mode range of the input preamplifiers.
  • Page 23 C The TPA3003D2 is a high-performance CMOS audio amplifier that requires adequate power supply decoupling to ensure 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 24 The differential input stage of the amplifier cancels any noise that appears on both input lines of the channel. To use the TPA3003D2 with a differential source, connect the positive lead of the audio source to the INP input and the negative lead from the audio source to the INN input. To use the TPA3003D2 with a single-ended source, ac ground the INP input through a capacitor equal in value to the input capacitor on INN and apply the audio source to the INN input.
  • Page 25 = 150°C – (45°C/W x 2 W) = 60°C Amax This calculation shows that the TPA3003D2 can drive 3 W of continuous RMS power per channel into an 8-Ω speaker up to an ambient temperature of 60°C. printed circuit board (PCB) layout Because the TPA3003D2 is a class-D amplifier that switches at a high frequency, the layout of the printed circuit board (PCB) should be optimized according to the following guidelines for the best possible performance.
  • Page 26 TPA3003D2 SLOS406A − FEBRUARY 2003 − REVISED MARCH 2003 Figure 29 shows the block diagrams of basic measurement systems for class-AB and class-D amplifiers. A sine wave is normally used as the input signal since it consists of the fundamental frequency only (no other harmonics are present).
  • Page 27 (b) Filter−Free and Traditional Class−D Figure 29. The TPA3003D2 uses a modulation scheme that does not require an output filter for operation, but they do sometimes require an RC low-pass filter when making measurements. This is because some analyzer inputs cannot accurately process the rapidly changing square-wave output and therefore record an extremely high level of distortion.
  • Page 28 TPA3003D2 SLOS406A − FEBRUARY 2003 − REVISED MARCH 2003 differential input and BTL output All of the class-D APAs and many class-AB APAs have differential inputs and bridge-tied load (BTL) outputs. Differential inputs have two input pins per channel and amplify the difference in voltage between the pins.
  • Page 29 APPLICATION INFORMATION AWG SIZE DC POWER LOSS (Ω) (mW) 22 to 28 22 to 28 and C . The filter components, R FILT www.ti.com TPA3003D2 AC POWER LOSS (mW) and C , can then be derived FILT FILT AP Analyzer Input...
  • Page 30 TPA3003D2 SLOS406A − FEBRUARY 2003 − REVISED MARCH 2003 The transfer function for this circuit is shown in equation (10) where ω = (C ). The filter frequency should be set above f FILT bandwidth, to avoid attenuating the audio signal. Equation (11) provides this cutoff frequency, f...

  • Page 31: Packaging Information

    www.ti.com PACKAGING INFORMATION Orderable Device Status TPA3003D2PFB ACTIVE TPA3003D2PFBG4 ACTIVE TPA3003D2PFBR ACTIVE TPA3003D2PFBRG4 ACTIVE The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs.

  • Page 32: Tape And Reel Information

    www.ti.com TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Type Drawing TPA3003D2PFBR TQFP PACKAGE MATERIALS INFORMATION Pins Reel Reel A0 (mm) Diameter Width (mm) W1 (mm) 1000 330.0 16.4 Pack Materials-Page 1 11-Mar-2008 B0 (mm) K0 (mm) Pin1 (mm) (mm)
  • Page 33 PACKAGE MATERIALS INFORMATION www.ti.com 11-Mar-2008 *All dimensions are nominal Device Package Type Package Drawing Pins Length (mm) Width (mm) Height (mm) TPA3003D2PFBR TQFP 1000 346.0 346.0 33.0 Pack Materials-Page 2...

  • Page 34: Mechanical Data

    PFB (S-PQFP-G48) 0,50 5,50 TYP 7,20 6,80 9,20 8,80 1,05 0,95 1,20 MAX NOTES: A. All linear dimensions are in millimeters. B. This drawing is subject to change without notice. C. Falls within JEDEC MS-026 MTQF019A – JANUARY 1995 – REVISED JANUARY 1998 0,27 0,08 0,17...

  • Page 36: Important Notice

    Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment.