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2*25w@4? TPA3123 class-d audio amplifier board user?s guide ? 2004-2009 sure electronics inc. aa-ab018_ver1.0
2*25w @4 ? TPA3123 class-d audio amplifier board user?s guide ? 2004-2009 sure electronics inc. a a-ab018_ver1.0_page i table of contents chapter 1. overview ..........................................................................................................1 1.1 overview .............................................................................................................. 1 1.2 features ............................................................................................................... 2 1.3 applications ......................................................................................................... 2 1.4 benefits ................................................................................................................ 3 1.5 quick start ........................................................................................................... 3 chapter 2. hardware detail ...............................................................................................5 2.1 power connection ............................................................................................... 5 2.2 input connections ............................................................................................... 5 2.3 output connections ............................................................................................ 6 2.4 connection with next board .............................................................................. 7 2.5 mute settings ....................................................................................................... 8 2.6 sleep settings ..................................................................................................... 8 2.7 gain settings ....................................................................................................... 9 2.8 dc offset ............................................................................................................ 10 2.9 led indicators ................................................................................................... 10 2.10 volume control ...................................................................................................11 2.11 notes ...................................................................................................................11 chapter 3. electrical characteristics .............................................................................12 chapter 4. mechanical drawing ......................................................................................14 chapter 5. appendix ........................................................................................................15 chapter 6. contact us .....................................................................................................16
2*25w @4 ? TPA3123 class-d audio amplifier board ? 2004-2009 sure electronics inc a a-ab018_ver1.0_page ii notes: product version ver 1.0 document version ver 1.0
2*25w @4 ? TPA3123 class-d audio amplifier board user?s guide ? 2004-2009 sure electronics inc. chapter 1. overview 1.1 overview welcome to use this 2*25w amplifier board from sure electronics. sure has developed many class-d amplifiers such as 0.5w, 2w, 8w, 15w, 50w, 100w and one-channel, dual-channel, four-channel amplifiers to meet different requirements of customers. as a new member of class-d amplifier series, this 2*25w amplifier board employs TPA3123d2 chip from ti. it supports dual channel amplif ication and each such channel is rated at 25w which helps producing state-of-the-art sound quality. the efficiency of the TPA3123d2 eliminates the need for an external heat sink when playing music. besides, integrating high-quality smd and mkp plug-in capacitors ensures hi-fi amplification output. this amplifier can readily be powered by any dc power supply ranging from +10 to 30v. you can use it to drive any 4 ? or 8 ? passive speakers. it?s an ideal choice for electronic hobbyists and audio enthusiasts. figure 1-1 product diagram a a-ab018_ver1.0_page 1
2*25w @4 ? TPA3123 class-d audio amplifier board figure 1-2 accessories note: the diagrams above are used for reference only. 1.2 features y a perfect "class d" architecture y fully-bridged stereo output y wide power supply range: +10v-30v y two kinds of input: line level input and analog audio input y frequency response: 20hz-20khz(3db) y signal/noise ratio: 100db(a-weighted) y high output power 10w @ 8 ? , < 10.0% thd+n 25w @ 4 ? , < 10.0% thd+n y high efficiency 92% @ 8w 8 ? 85% @ 16w 4 ? y audiophile quality sound 0.08% thd+n @ 5w 8 ? 0.08% thd+n @ 10w 4 ? y sensitivity and gain adjustable y over/under voltage turn off y over current protection y over temperature protection 1.3 applications y active subwoofers y home theater receiver y multi-channel distribution y active dvd system y mini/micro systems ? 2004-2009 sure electronics inc a a-ab018_ver1.0_page 2
overview 1.4 benefits y mounting holes facilitate installation and fixing y several wiring methods facilitate connection y excellent design of the power ports which allows you to cascade multiple amplifier boards (max 4 recommended) y excellent heat dissipation eliminates t he requirement of an extra heat sink note: output signal cannot be bridged again. 1.5 quick start suggested connection is shown in figure 1-3. figure 1-3 connection schematic note: please observe the following steps to complete verification so as to ensure the products are intact during transit. 1. open the amplifier package and make su re the product is intact (no missing or damaged components and no deformation) 2. please observe the connection schema tics when connecting the amplifier board. use a nearby sound source, such as mp3 or cd player to have a trial. this amplifier board can be d eemed as qualified if you can hear the sound corresponding to that sound source. ? 2004-2009 sure electronics inc. a a-ab018_ver1.0_page 3
2*25w @4 ? TPA3123 class-d audio amplifier board figure 1-4 cascading schematic note: gnd should be grounded or connected to the housing of the device. ? 2004-2009 sure electronics inc a a-ab018_ver1.0_page 4
2*25w @4 ? TPA3123 class-d audio amplifier board user?s guide ? 2004-2009 sure electronics inc. chapter 2. hardware detail 2.1 power connection to power the amplifier board, use either jack or terminal blocks. on-board diodes can prevent the consequence of wrong connection of power supply. figure 2-1 power connection table 2-1 power connection connector mark description jack j11 dc 10-30v power supply vcc the positive of dc 10-30v power supply terminal blocks j10 gnd the negative of dc 10-30v power supply note: 1. you are allowed to use only one way to power the amplifier board at a time. 2. the maximum supply voltage shall not exceed 30v. 2.2 input connections you may use rca connectors to input audio signal. a a-ab018_ver1.0_page 5
2*25w @4 ? TPA3123 class-d audio amplifier board figure 2-2 input connection table 2-2 input connection connector mark channel description j2 channel 1 input rca connector j7 channel 2 input j3 (pin 1) channel 1 input j3 (pin 2) gnd terminal blocks j3 (pin 3) channel 2 input note: you are allowed to feed only one group (dual channel) of audio signal to the amplifier board at a time. please refer to 2.6 ?gain setting? for details. 2.3 output connections you can use either terminal blocks or banana connectors to output audio signal. two pairs of banana jacks are provided for free. figure 2-3 output connection 1 ? 2004-2009 sure electronics inc a a-ab018_ver1.0_page 6
hardware detail figure 2-4 output connection 2 note: 1*: not provided here. it can be used together with banana jack (?2? above) facilitating wiring. you can click http://www.sureelectronics.net/goods.php?id=1036 for details. 3*: included in the accessories but selectable to be installed. table 2-3 output connection connector mark description positive output of channel 1 j1 negative output of channel 1 j5 j6 negative output of channel 2 banana connectors positive output of channel 2 j9 j4 output of channel 1 terminal blocks refer to on-board descriptions for connection details output of channel 2 j8 note: never connect more than one group of speaker to the audio output. 2.4 connection with next board j10 and j12 on terminal blocks are used to connect more amplifier boards. figure 2-5 connection schematic ? 2004-2009 sure electronics inc. a a-ab018_ver1.0_page 7
2*25w @4 ? TPA3123 class-d audio amplifier board table 2-4 connection with next board connector mark description vdd connect to positive (+) of dc 10 to 36v power supply (j10) of the next board j12 connect to negative (gnd) of dc 10 to 36v power supply (j10) of the next board gnd sd sleep control j13 mute mute control note: 1. maximum 4 amplifiers are recommended to be connected in series. 2. remember to use awg12-compliant cable or equivalent for series connection. 2.5 mute settings to mute the output audio signal, connect ?vdd? and ?mute? of the terminal block with a piece of lead. usually, ?mute? shall be left unconnected. figure 2-6 mute settings table 2-5 mute settings connector mark description j13 mute when ?mute? is connected with ?vdd?, both channels will be muted and enter into idle mode. when connected to ground or left unconnected, both channels will resume regular operation. note: please power the amplifier board with dc 10-30v. 2.6 sleep settings to enable sleep setting, connect ?vdd? and ?sd? of the terminal block with a piece of lead. usually, ?sd? shall be left unconnected. ? 2004-2009 sure electronics inc a a-ab018_ver1.0_page 8
hardware detail figure 2-7 sleep settings table 2-6 sleep settings connector mark description j13 when ?sd? is connected with ?vdd?, both channels will be set to sleep and enter low-power-consum ption working mode. when connected to ground or left unconnected, both channels will resume regular operation. sd note: ?sd? means that the chip works with low power consumption. ?mute? means that the chip normally works with no output. 2.7 gain settings the on-board 2-slide dip switch, which is mark ed as ?sw1?, is used to set the gain of amplifier board. the two slides are marked as k1, k2 respectively. the following table lists the gain values on different settings: ? 2004-2009 sure electronics inc. a a-ab018_ver1.0_page 9
2*25w @4 ? TPA3123 class-d audio amplifier board figure 2-8 gain settings table 2-7 gain settings settings amplification gain k1 k2 gain level power gain (db) typical on on weak 20 off on low 26 on off medium 32 off off high 36 note: 1. high: portable mp3/cd player with built-in volume control medium and low: general-purpose use weak: preamplifier with fairly high output signal 2. different gain levels correspond to differ ent input sensitivities. improper selection will cause the audio distortion or even damage the amplifier board. 3. no preamplifier or other devices are needed for gain settings. we won?t assume any responsibility for the damage caused by connecting extra devices. 2.8 dc offset capacitive coupling output is applied to ensure no dc offset output. 2.9 led indicators this amplifier has one power led indicator wh ich is marked as ?power (d2)?. the power indicator will be illuminated in green when power-up. please refer to the connection schematics of the board for the led location. ? 2004-2009 sure electronics inc a a-ab018_ver1.0_page 10
hardware detail figure 2-9 led indicator 2.10 volume control no potentiometer is provided for manually adjusting the volume. the volume control of sound source like mp3 player or pc can be used to adjust the loudness of the audio output or a 50k ? potentiometer can be installed by us ers themselves, but it may cause signal attenuation. to compensate that attenuation, adjusting the gain value is required. you may refer to 2.7 gain setting for details. please be aware that audio clippings may occur to some portable players because of the audio source not the amplifier itself. please increase the input gain of amplifier board. 2.11 notes in order to protect amplifier board and extend its service lifetime, please read the following warnings carefully since warranties will be voided if you do not observe the following warnings: warning 1: quality-related issues caused by pot entiometers installed by buyers. warning 2: in order to achieve a better sound quality, please use stable power supply since a bad or unstable power supply may worsen the sound quality or even cripple the amplifier board. warning 3: never equip a pre-amplifier to the audio input since the amplifier itself has powerful amplification ability and a high signal in put will burn out the amplifier chip. warning 4: in order to protect amplifier and speaker, pl ease turn the volume output to the minimum when hooking up the amplifier and you may r eadjust the volume when you are sure that the amplifier is functioning properly. ? 2004-2009 sure electronics inc. a a-ab018_ver1.0_page 11
2*25w @4 ? TPA3123 class-d audio amplifier board user?s guide ? 2004-2009 sure electronics inc. chapter 3. electrical characteristics following table lists all typical data. for full spec ification, please refer to the ti data sheet of TPA3123 chip. t a =20 , dc24v, f=1000hz, sine wave input, r l =4 , gain=20db (unless otherwise stated) table 3-1 electrical characteristics parameter condition min. typ. max. supply voltage - 10v - 30v supply current - - - 2a signal/noise ratio - 90db 100db - gain 36db - 0.100v 0.117v - gain 32db - 0.180v 0.196v - gain 28db - 0.380v 0.396v - input sensitivity gain 20db - 0.780v 0.803v - v dd =24v, r l =4 , pout=10w - 0.08% - thd+n* v dd =24v, r l =8 , pout=5w - 0.08% - frequency range - 20hz-20khz ?3db ? v dd =24v, r l =4 , p out =16w - 85% - efficiency v dd =24v, r l =8 , p out =8w - 92% - v dd =24v, r l =4 , f=1000hz - 16w - thd+n<1% v dd =24v, r l =8 , f=1000hz - 8w - v dd =24v, r l =4 , f=1000hz - 20w - output power thd+n<10% v dd =24v, r l =8 , f=1000hz - 10w - input impedance - - 60k - minimum load - 3.2 - - high-level input voltage - 2v - - sd, mute* low-level - - - 0.8v a-ab018_ver1.0_page 12 a
2*25w@4? TPA3123 class-d audio amplifier board ? 2004-2009 sure electronics inc. a a-ab018_ver1.0_page 13 input voltage channel separation* - -50db -60db - sw1 - k1 k2 - - - weak - on on 18 db 20 db 22 db low - off on 24 db 26 db 28 db medium - on off 30 db 32 db 34 db power gain* high - off off 34 db 36 db 38 db operating temperature - 0 20 50 storage temperature - -20 20 105 thermal shutdown* - - 150 - note: *the chip specifications from ti?s TPA3123 data sheet.
2*25w @4 ? TPA3123 class-d audio amplifier board user?s guide ? 2004-2009 sure electronics inc. chapter 4. mechanical drawing figure 4-1 mechanical drawing a-ab018_ver1.0_page 14 a
2*25w @4 ? TPA3123 class-d audio amplifier board user?s guide ? 2004-2009 sure electronics inc. chapter 5. appendix figure 5-1 schematic a a-ab018_ver1.0_page 15 j2 ch1 1 2 j1 out1+ 1 pin10 pin12 j6 out1- 1 d2 led/g j12 con2 2 1 vcc j3 con4 1 2 3 c18 0.1uf vcc ? 5a c7 1uf/50v j13 con2 1 2 c29 0.1uf c17 1uf/50v + c23 470uf/35v 1 2 l1 33uh c1 0.22uf/mk p sw1 sw dip-2/sm 1 2 4 3 r8 10k vcc vcc vcc mu te vcc c4 1uf/50v c26 0.22uf//mkp + c25 470uf/35v 1 2 vcc c13 0.22uf vcc vcc c9 1uf/50v gaina1 sd c5 0.47uf/mkp c3 0.22uf c20 1uf/50v c11 0.47uf/mkp ? j4 con2 2 1 j5 out1- 1 c12 1uf/50v l2 33uh + c14 470uf/35v 1 2 vcc j7 ch2 1 2 j8 con2 1 2 vcc r1 4.7k c30 1uf/50v gaina0 vcc pin1 pin3 mute vcc c16 1uf/50v vcc + c2 470uf/35v 1 2 gaina0 u1 TPA3123/htssop 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 pvccl1 sd pvccl2 mute lin rin bypass agnd1 agnd2 pvccr1 vclamp pvccr2 pgndr1 pgndr2 rout bsr gain1 gain0 avcc1 avcc2 bsl lout pgndl1 pgndl2 j11 dj005b 3 2 1 gaina1 c21 1uf/50v r6 0r r5 10k + c22 470uf/35v 1 2 c15 1uf/50v ? sd j10 con2 1 2 c6 1uf/50v c27 0.22uf//mkp c8 0.1uf d1 ss34 1 2 c10 0.22uf/mkp c28 0.1uf j9 out1+ 1 sd c19 0.1uf vcc r3 4.7k r7 100k vcc r4 10k r2 4.7k 1 + c24 470uf/35v 2 note: the above schematic is used for reference only. there might be a tiny difference in production batch.
2*25w @4 ? TPA3123 class-d audio amplifier board user?s guide ? 2004-2009 sure electronics inc. chapter 6. contact us sure electronics co., ltd. 5f, zone a, qinhuai technology innovation center 105-2 daming rd (zip:210022) nanjing p.r.china tel: +86 - 13601408832 (for technical questions only) +86-25-66606340 (english service, from gmt1-10am) fax: +86-25- 66606341-866 website: www.sure-electronics.com www.sure-electronics.net a-ab018_ver1.0_page 16 a

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