SLOS406A − FEBRUARY 2003 − REVISED MARCH 2003 FEATURES D 3-W/Ch Into an 8-Ω Load From 12-V Supply D Efficient, Class-D Operation Eliminates D D 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.
SLOS406A − FEBRUARY 2003 − REVISED MARCH 2003 AVAILABLE OPTIONS PACKAGED DEVICE 48-PIN TQFP (PFB)† TA −40°C to 85°C TPA3003D2PFB † 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).
SLOS406A − FEBRUARY 2003 − REVISED MARCH 2003 functional block diagram V2P5 PVCC V2P5 VClamp Gen VCLAMPR BSRN PVCCR(2) Gate Drive RINN ROUTN(2) PGNDR BSRP PVCCR(2) Deglitch & Gain Adj. Modulation Logic RINP V2P5 Gate Drive VREF VOLUME Gain Control FADE PGNDR To Gain Adj.
SLOS406A − FEBRUARY 2003 − REVISED MARCH 2003 Terminal Functions TERMINAL NO. NAME AGND 9, 10, 26 AVCC AVDD AVDDREF BSLN BSLP I/O DESCRIPTION − Analog ground for digital/analog cells in core 33 − High-voltage analog power supply (8.5 V to 14 V) 29 O 5-V Regulated output 7 O 5-V Reference output—provided for connection to adjacent VREF terminal.
SLOS406A − FEBRUARY 2003 − REVISED MARCH 2003 absolute maximum ratings over operating free-air temperature range (unless otherwise noted)† Supply voltage range: AVCC, PVCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.3 V to 15 V Input voltage range, VI: MUTE, VREF, VOLUME, FADE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V to 5.5 V SD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SLOS406A − FEBRUARY 2003 − REVISED MARCH 2003 dc characteristics, TA = 25°C, VCC = 12 V, RL = 8 Ω (unless otherwise noted) PARAMETER TEST CONDITIONS | VOS | Output offset voltage (measured differentially) INN and INP connected together, Gain = 36 dB V2P5 (terminal 4) 2.5-V Bias voltage No load PSRR Power supply rejection ratio ICC ICC(MUTE) Supply quiescent current VCC = 11.5 V to 12.5 V MUTE = 2 V, SD = 2 V MUTE mode quiescent current MUTE = 3.
SLOS406A − FEBRUARY 2003 − REVISED MARCH 2003 Table 1. DC Volume Control VOLTAGE ON THE VOLUME PIN AS A PERCENTAGE OF VREF (INCREASING VOLUME OR FIXED GAIN) VOLTAGE ON THE VOLUME PIN AS A PERCENTAGE OF VREF (DECREASING VOLUME) GAIN OF AMPLIFIER % % dB 0 − 4.5 0 − 2.9 −75† 4.5 − 6.7 2.9 − 5.1 −40.0 6.7 − 8.91 5.1 − 7.2 −37.5 8.9 − 11.1 7.2 − 9.4 −35.0 11.1 − 13.3 9.4 − 11.6 −32.4 13.3 − 15.5 11.6 − 13.8 −29.9 15.5 − 17.7 13.8 − 16.0 −27.4 17.7 − 19.9 16.0 − 18.2 −24.
SLOS406A − FEBRUARY 2003 − REVISED MARCH 2003 TYPICAL CHARACTERISTICS Table of Graphs FIGURE PO Efficiency vs Output power 1 Output power vs Load resistance 2 vs Supply voltage 3 IQ ICC Quiescent supply current vs Supply voltage 4 Supply current vs Output Power 5 IQ(sd) Quiescent shutdown supply current vs Supply voltage 6 Input impedance vs Gain vs Frequency THD+N Total harmonic distortion + noise kSVR Supply ripple rejection ratio vs Output power vs Frequency Closed
SLOS406A − FEBRUARY 2003 − REVISED MARCH 2003 TYPICAL CHARACTERISTICS EFFICIENCY vs OUTPUT POWER OUTPUT POWER vs LOAD RESISTANCE 80 8 70 7 VCC = 12 V, RL = 8 Ω 60 PO − Output Power − W 6 Efficiency − % VCC = 8.5 V, RL = 8 Ω 50 40 LC Filter Resistive Load 30 20 10 VCC = 12 V, THD = 10% 5 Thermally Limited 4 3 2 VCC = 8.5 V, THD = 10% 1 0 0 0.5 1 1.5 2 PO − Output Power − W 2.5 VCC = 8.
SLOS406A − FEBRUARY 2003 − REVISED MARCH 2003 TYPICAL CHARACTERISTICS SUPPLY CURRENT vs OUTPUT POWER (TOTAL) QUIESCENT SHUTDOWN SUPPLY CURRENT vs SUPPLY VOLTAGE 0.8 0.5 0.4 0.3 0.2 0 0.8 0.6 VSD = 0.8 V 0.4 0.2 VSD = 0 V CC 0.1 1 0 1 2 3 4 5 PO − Output Power (Total) − W 6 I − Supply Current − A 0.6 I CC − Quiescent Shutdown Supply Current − µ A VCC = 12 V, RL = 8 Ω 0.7 0 8.
SLOS406A − FEBRUARY 2003 − REVISED MARCH 2003 TYPICAL CHARACTERISTICS TOTAL HARMONIC DISTORTION + NOISE vs OUTPUT POWER TOTAL HARMONIC DISTORTION + NOISE vs FREQUENCY 10 THD+N − Total Harmonic Distortion + Noise − % THD+N − Total Harmonic Distortion + Noise − % 10 VCC = 12 V, RL = 8 Ω, TA = 25°C 5 2 1 PO = 1 W 0.5 PO = 0.5 W 0.2 0.1 0.05 PO = 3.5 W 0.02 0.01 20 50 100 200 500 1 k 2 k f − Frequency − Hz VCC = 8.5 V, RL = 8 Ω, TA = 25°C 5 2 1 0.5 f = 1 kHz f = 20 Hz 0.2 0.1 0.
SLOS406A − FEBRUARY 2003 − REVISED MARCH 2003 TYPICAL CHARACTERISTICS CLOSED LOOP RESPONSE CLOSED LOOP RESPONSE 100 50 Gain 0 Gain 50 0 Phase 50 0 −50 0 −50 −100 −100 Phase − Deg Gain − dB Gain − dB 100 Phase −50 −50 −100 −100 −150 −150 −150 −200 VCC = 12 V, Gain = +5.
SLOS406A − FEBRUARY 2003 − REVISED MARCH 2003 TYPICAL CHARACTERISTICS CROSSTALK vs FREQUENCY MUTE ATTENUATION vs FREQUENCY −30 −60 −50 −70 Crosstalk − dB VCC = 12 V, RL = 8 Ω, VI = 1 Vrms Class-D, VOLUME = 0 V −40 Mute Attenuation − dB −65 VCC = 12 V, Gain = +13.
SLOS406A − FEBRUARY 2003 − REVISED MARCH 2003 VCC ROUT+ GND VCC ROUT− APPLICATION INFORMATION C23 1 nF C22 1 nF L1 (Bead) L2 (Bead) 10 µF PGND 10 nF 10 nF C15 0.1uF 0.1uF C9 C10 1 µF 1 µF P1 50 kΩ BSRP PVCCR ROUTP ROUTP PGNDR ROUTN PGNDR ROUTN PVCCR NC RINP MUTE V2P5 AVCC LINP NC LINN NC TPA3003D2 AVDDREF GND AVDD AGND COSC AGND ROSC VOLUME AGND REFGND VCLAMPL PGND 1 µF C13 0.
SLOS406A − FEBRUARY 2003 − REVISED MARCH 2003 APPLICATION INFORMATION class-D operation This section focuses on the class-D operation of the TPA3003D2. traditional class-D modulation scheme The traditional class-D modulation scheme, which is used in the TPA032D0x family, has a differential output where each output is 180 degrees out of phase and changes from ground to the supply voltage, VCC.
SLOS406A − FEBRUARY 2003 − REVISED MARCH 2003 APPLICATION INFORMATION TPA3003D2 modulation scheme (continued) OUTP OUTN Differential Voltage Across Load Output = 0 V +12 V 0V −12 V Current OUTP OUTN Differential Voltage Output > 0 V +12 V 0V Across Load −12 V Current Figure 23.
SLOS406A − FEBRUARY 2003 − REVISED MARCH 2003 APPLICATION INFORMATION effects of applying a square wave into a speaker Audio specialists have advised for years not to apply a square wave to speakers. If the amplitude of the waveform is high enough and the frequency of the square wave is within the bandwidth of the speaker, the square wave could cause the voice coil to jump out of the air gap and/or scar the voice coil.
SLOS406A − FEBRUARY 2003 − REVISED MARCH 2003 APPLICATION INFORMATION when to use an output filter (continued) 33 µH OUTP L1 33 µH C1 C2 0.1 µF 0.47 µF OUTN L2 C3 0.1 µF Figure 24. Typical LC Output Filter, Cutoff Frequency of 41 kHz, Speaker Impedance = 8 Ω Ferrite Chip Bead OUTP 1 nF Ferrite Chip Bead OUTN 1 nF Figure 25. Typical Ferrite Chip Bead Filter (Chip bead example: Fair-Rite 2512067007Y3) volume control operation The VOLUME terminal controls the internal amplifier gain.
SLOS406A − FEBRUARY 2003 − REVISED MARCH 2003 APPLICATION INFORMATION volume control operation (continued) If using an analog potentiometer to control the gain, it should be connected between VREF and REFGND. VREF can be connected to AVDDREF or an external voltage source, if desired. The first and second column in Table 1 should be used to determine the point at which the gain changes depending on the direction that the potentiometer is turned.
SLOS406A − FEBRUARY 2003 − REVISED MARCH 2003 APPLICATION INFORMATION FADE operation The FADE terminal is a logic input that controls the operation of the volume control circuitry during transitions to and from the shutdown state and during power-up. A logic low on this terminal places the amplifier in the fade mode.
SLOS406A − FEBRUARY 2003 − REVISED MARCH 2003 APPLICATION INFORMATION SD = 0 V GND Figure 28. Differential Output With FADE Terminal Held High 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. Quiescent current is listed in the dc characteristics specification table.
SLOS406A − FEBRUARY 2003 − REVISED MARCH 2003 APPLICATION INFORMATION 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. The selection of the capacitor value on the V2P5 terminal is critical for achieving the best device performance.
SLOS406A − FEBRUARY 2003 − REVISED MARCH 2003 APPLICATION INFORMATION The value of Ci is important, as it directly affects the bass (low frequency) performance of the circuit. Consider the example where Zi is 20 kΩ and the specification calls for a flat bass response down to 20 Hz. Equation 6 is reconfigured as equation 7. Ci + 1 2p Z i f c (7) In this example, Ci is 0.4 µF, so one would likely choose a value in the range of 0.47 µF to 1 µF.
SLOS406A − FEBRUARY 2003 − REVISED MARCH 2003 APPLICATION INFORMATION differential input 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.
SLOS406A − FEBRUARY 2003 − REVISED MARCH 2003 APPLICATION INFORMATION thermal considerations: output power and maximum ambient temperature (continued) Example. What is the maximum ambient temperature for an application that requires the TPA3003D2 to drive 3 W into an 8-Ω speaker (stereo)? PDissipated = 6 W x ((1 / 0.
SLOS406A − FEBRUARY 2003 − REVISED MARCH 2003 APPLICATION INFORMATION 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). An analyzer is then connected to the APA output to measure the voltage output. The analyzer must be capable of measuring the entire audio bandwidth.
SLOS406A − FEBRUARY 2003 − REVISED MARCH 2003 APPLICATION INFORMATION Power Supply Signal Generator APA RL Analyzer 20 Hz − 20 kHz (a) Basic Class−AB Power Supply Low−Pass RC Filter Signal Generator Class−D APA RL Low−Pass RC Filter Analyzer 20 Hz − 20 kHz (b) Filter−Free and Traditional Class−D Figure 29.
SLOS406A − FEBRUARY 2003 − REVISED MARCH 2003 APPLICATION INFORMATION 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. Differential inputs reduce the common-mode noise and distortion of the input circuit. BTL is a term commonly used in audio to describe differential outputs.
SLOS406A − FEBRUARY 2003 − REVISED MARCH 2003 APPLICATION INFORMATION Table 2. Recommended Minimum Wire Size for Power Cables POUT (W) RL (Ω) AWG SIZE DC POWER LOSS (mW) AC POWER LOSS (mW) 1 8 22 to 28 2.0 8.0 2.1 8.1 < 0.75 8 22 to 28 1.5 6.1 1.6 6.2 Class-D RC low-pass filter A RC filter is used to reduce the square-wave output when the analyzer inputs cannot process the pulse-width modulated class-D output waveform.
SLOS406A − FEBRUARY 2003 − REVISED MARCH 2003 APPLICATION INFORMATION The transfer function for this circuit is shown in equation (10) where ωO = REQCEQ, REQ = RFILTRANA and CEQ = (CFILT + CANA). The filter frequency should be set above fMAX, the highest frequency of the measurement bandwidth, to avoid attenuating the audio signal. Equation (11) provides this cutoff frequency, fC.
PACKAGE OPTION ADDENDUM www.ti.
PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 TAPE AND REEL INFORMATION *All dimensions are nominal Device TPA3003D2PFBR Package Package Pins Type Drawing TQFP PFB 48 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 1000 330.0 16.4 Pack Materials-Page 1 9.6 B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 9.6 1.5 12.0 16.
PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TPA3003D2PFBR TQFP PFB 48 1000 367.0 367.0 38.
MECHANICAL DATA MTQF019A – JANUARY 1995 – REVISED JANUARY 1998 PFB (S-PQFP-G48) PLASTIC QUAD FLATPACK 0,27 0,17 0,50 36 0,08 M 25 37 24 48 13 0,13 NOM 1 12 5,50 TYP 7,20 SQ 6,80 9,20 SQ 8,80 Gage Plane 0,25 0,05 MIN 0°– 7° 1,05 0,95 Seating Plane 0,75 0,45 0,08 1,20 MAX 4073176 / B 10/96 NOTES: A. All linear dimensions are in millimeters. B. This drawing is subject to change without notice. C.
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.
