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| Tr i path Technol ogy, I nc. - Techni cal I nfor m ati on EB-TA2022 CLASS-T DIGITAL AUDIO AMPLIFIER 2 CHANNEL TA2022 EVALUATION BOARD Technical Information Revision 1.0 - March 2002 GENERAL DESCRIPTION The EB-TA2022 Version 4.0 is a stereo 100W per channel audio amplifier designed to provide a simple and straightforward environment for the evaluation of the TA2022 amplifier. This evaluation board includes a circuit that will automatically trim any DC offset at the output and a relay. For additional documentation on the TA2022, see the TA2022 Data Sheet. APPLICATIONS FEATURES High Power: 100W @ 4, 1.0% THD+N Low Noise Floor: 150uV A-weighted Mini/Micro Component Systems Home Theater Receivers Car stereo head units & trunk amplifiers Powered DVD Systems BENEFITS More power per cubic inch for 100W per channel design Simplifies thermal management Signal Quality comparable to linear amplifiers Simple building block for multi-channel design Low Distortion: .02% THD+N @ 75W, 4 High Efficiency: 92% for 8 loads 87% for 4 loads Dynamic Range = 102dB Over-Current Protection Over and Under Voltage Protection Over Temperature Protection Single Ended Outputs 1 EB-TA2022 - Rev. 1.0/03.02 Tr i path Technol ogy, I nc. - Techni cal I nfor m ati on OPERATING INSTRUCTIONS BOARD CONNECTION DIAGRAM AWAKE MUTE TA2022 AGND 5V IN1 AGND IN2 J1 Audio Source OUT2 AGND OUT1 J3 + VPP - - J2 V+ Pgnd V- Vo2 GND2 GND1 Vo1 + + 5V +- Pgnd +- VNN Speaker Right Speaker Left Three external power supplies are required to operate the EB-TA2022: VPP, VNN (referenced to Pgnd), and 5V (referenced to Agnd). The VPP and VNN form a split rail supply referenced to Pgnd. The 5V ground (Agnd) must be kept separate from the VPP and VNN ground (Pgnd). Agnd and Pgnd are joined at a common point on the EB-TA2022 near headers J2 and J3. Minimum and Maximum supply voltages are +/-20V and +/-36V, respectively, depending on the load impedance. It is not recommended that the EB-TA2022 be operated above +/-31V when driving 4 loads, single ended, as the internal current limit circuit may activate, causing the amplifier to mute. The VPP and VNN power supply connection, J3, is through a 7-Pin 0.156" spaced header. The female terminal housing for this header is Molex 09-50-8071. Please see TABLE 2 for header connections. The 5V power supply connection, J2, is through a 5-Pin 0.100" spaced header. The female terminal housing for this header is Molex 22-01-2057. Please see TABLE 1 for header connections. 2 EB-TA2022 - Rev. 1.0/03.02 Tr i path Technol ogy, I nc. - Techni cal I nfor m ati on TABLE 1 J2 Connector Pin# Pin1 Pin2 Pin3 Pin4 Pin5 Connection Agnd 5V IN1 Agnd IN2 TABLE 2 J3 Connector Pin# Pin1 Pin2 Pin3 Pin4 Pin5 Pin6 Pin7 Connection Vo1 GND1 GND2 Vo2 VNN Pgnd VPP OUTPUT The output connection for each channel of the EB-TA2022 is made at pins 1 - 4 of header J3. The output of the TA2022 is single-ended, therefore each output has a positive output (Vo1 and Vo2) and a ground (GND1 and GND2). INPUT The input connection for each channel of the EB-TA2022 is made at pins 3 - 5 of header J2. The left and right inputs should be connected to IN1 (pin3) and IN2 (pin5). These inputs share a common ground referenced to Agnd (pin4). JUMPER SETTINGS There is a 3-pin header for the MUTE control of the TA2022. With the jumper placed in the AWAKE position the part is un-muted by grounding (AGND) the mute pin. When the jumper is placed in the MUTE position the mute pin is pulled high (5V) and the amplifier is muted. OUTPUT OFFSET NULL AND RELAY There is an automatic offset trim circuit for each channel using an LM358 op-amp. Once the LM358 trims any DC to 0Vdc a comparator allows a relay to close. GAIN SETTING The gain of the EB_TA2022 Version 4.0 is set to 18V/V. The gain of the TA2022 is the product of the input stage and the modulator stage. The input stage gain is set to unity. Before changing the gain of the TA2022, please refer to the TA2022 Amplifier Gain section of the TA2022 Data Sheet. 3 EB-TA2022 - Rev. 1.0/03.02 Tr i path Technol ogy, I nc. - Techni cal I nfor m ati on Performing Measurements on the EB-TA2022 Version 4.0 The TA2022 operates by generating a high frequency switching signal based on the audio input. This signal is sent through a low-pass filter that recovers an amplified version of the audio input. The frequency of the switching pattern is spread spectrum in nature and typically varies between 100kHz and 1MHz, which is well above the 20Hz - 20kHz audio band. The pattern itself does not alter or distort the audio input signal, but it does introduce some inaudible components. The measurements of certain performance parameters, particularly noise related specifications such as THD+N, are significantly affected by the design of the low-pass filter used on the output as well as the bandwidth setting of the measurement instrument used. Unless the filter has a very sharp roll-off just beyond the audio band or the bandwidth of the measurement instrument is limited, some of the inaudible noise components introduced by the TA2022 amplifier switching pattern will degrade the measurement by including out of band (audio) energy. One feature of the TA2022 is that it does not require large multi-pole filters to achieve excellent performance in listening tests, usually a more critical factor than performance measurements. Though using a multi-pole filter may remove high-frequency noise and improve THD+N type measurements (when they are made with wide-bandwidth measuring equipment), these same filters degrade frequency response. The EB-TA2022 has a simple two-pole output filter with excellent performance in listening tests. (See Application Note 4 for additional information on bench testing) Contact Information TRIPATH TECHNOLOGY, INC 2560 Orchard Parkway, San Jose, CA 95131 408.750.3000 - P 408.750.3001 - F For more Sales Information, please visit us @ www.tripath.com/cont_s.htm For more Technical Information, please visit us @ www.tripath.com/data.htm 4 EB-TA2022 - Rev. 1.0/03.02 EB-TA2022 Revised: 3/18/2001 JR. Revision: Ver4.0 Bill Of Materials Item Quantity Reference Part Digikey Part # Manufacturers Part# (Package) ________________________________________________________________________________________________________________ 1 10 C33,C41,C42,C43,C48, 0.1uF;50V PCC1864CT-ND Panasonic ECJ-2VF1H104Z (SMT 0805) C49,C3,C8,C9,C10 2 2 C44,C45 0.1uF;100V AVX-12061C104KAT2A (SMT 1206) 3 1 C47 390pF;50V PCC391CGCT-ND PANASONIC ECJ-2VC1H391J(SMT 0805) 4 1 C46 330pF;50V PCC331CGCT-ND PANASONIC ECJ-2VC1H331J(SMT 0805) 5 2 C35,C36,C4,C6 3.3uF;25V P6626-ND Panasonic ECE-A25Z3R3(Thru-Hole) 6 4 C37,C38,C39,C40 0.22uF;50V P4667-ND Panasonic ECQ-V1H224JL(Thru-Hole) 7 2 C29,C32 220uF;50V P10326-ND Panasonic EEU-FC1H221S(Thru-Hole) 8 1 C34 100uF;35V P5165-ND Panasonic ECA-1VM101(Thru-Hole) 9 2 C27,C28 47uF;16V P810-ND Panasonic ECE-A1CKA470(Thru-Hole) 10 1 C5 22uF, 10V P960-ND Panasonic ECE-A1AKS220(Thru-Hole) 11 3 D1,D8,D9 B1100/B B1100DICT-ND Diodes Inccorporated (SMA) 12 4 D5,D11,D12,D13 MURS120T3 MURS120T3 (SMT SMB) 13 1 D4 1N5243 1N5243BDICT-ND 13V, 500mW, DO-35 14 1 D2 1N5235 1N5235BDICT-ND 6.8V, 500mW, DO-35 15 1 D3 1N4148 1N4148DICT-ND DO-35 16 1 D6 LED 17 1 J3 7-pin,0.156" header WM4605-ND Molex 26-48-1075 18 1 J2 5-pin,0.100" header WM4203-ND Molex 22-23-2051 19 1 J1 3-pin,0.100" header WM4001-ND Molex 22-03-2031 20 21 22 1 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 2 1 2 2 1 5 4 2 1 4 2 1 4 1 1 5 1 3 1 3 J9,J10 L4 L5,L6 R47,R48 R16 R30,R33,R34,R35,R50 R36,R38,R39,R40 R1,R17 R42 R31,R37,R41,R52 R18,R19 R8 R32,R43,R44,R51 R7 R9 R2,R10,R12,R14,R15 R5 R3,R11,R13 R4 R45,R46,R6 Screw Terminal 100uH 11uH 249 300 1K 1.2K 3K 8.2K,1% 9.1K,1% 10K 15K 20K, 1% 25K 35K 50K 80K 100K 200K 249K,1% 8190K-ND TK4300-ND Keystone 8190 JWMiller 6000-101k or Toko 187LY-101J American Cores AW-690-06-44T-22-V*see note (SMT (SMT (SMT (SMT (SMT (SMT (SMT (SMT (SMT (SMT (SMT (SMT (SMT (SMT (SMT (SMT (SMT 0805) 0805) 0805) 0805) 0805) 0805) 0805) 0805) 0805) 0805) 0805) 0805) 0805) 0805) 0805) 0805) 0805) 40 41 42 43 44 45 46 47 48 49 50 51 52 2 1 1 1 3 1 1 4 4 2 2 2 2 R56,57 U2 U1 U3 Q1,Q2,Q4 Q3 K1 CON1,CON2,CON3,CON4 STANDOFF NUT screw terminal(horiz.) screw terminal screw TA2022 washer TA2022 screw 6;2W TA2022 LM358 LM339 2N7000 2N3906 DPDT RELAY 8A,24V 3/8"STANDOFF HEX 4-40 J9,J10 1/4" 4-40 NO. 4 FLAT 3/8" 4-40 P6.2W-2BK-ND LM358N-ND LM339N-ND 2N7000FS-ND 2N3906-ND PB297-ND 4801K-ND H616-ND 8190k-nd H342-ND H734-ND H781-ND (2W Thru-hole) Tripath Technology 8-Dip 14-Dip TO-92 TO-92 RTE24024F Keystone 8190 Note 1: Inductor selection is critical for optimal operation of the TA2022 as well as being an important component in over current protection and EMI containment. Tripath recommends the customer use a toroidal inductor for all applications with the TA2022. For typical applications we recommend the Micrometals T68-2 core or the American Cores (Amidon) T690-06. This core has a high peak current capability due to its low-m Carbonyl-E metal powder. A distributed air gap increases its' energy storage capability, Which allows for a small footprint and high current capability. The T68-2 and T690-06 cores have a 17.5mm outer diameter. Forty-four turns of 22AWG wire makes a complete single layer winding around the toroid with six to eight layers overlapping yielding an ideal value of 11uH. This widing pattern, which covers the core completely, aids in shielding the electric field. It should be noted that when multiple layers are used there may be an increase in winding capacitance, which can cause ringing and increased radiated emmisions. Winding techniques, such as bank winding, can minimize this effect. It is important that the innitial windings not be crossed over by the last few windings. If a few windings more than the single layer are required it is best to wind the core with a full single layer, back off a number of turns,and rewind over the last few windings. A larger diameter Carbonyl-E core may be used if a single layer wound core is required. If a smaller core is required, a 15.2mm outer diameter Carbonyl-E core may be substituted, though thermal requirements must be considered. Please contact Tripath Applications if there are questions pertaining to this subject. Substitution Notes: 1- ITEM#2- This component must be .1uF, 100V with X7R material characteristic and placed close to pins 4,8 and 9,10 of TA2022 with less than 1/8" lead length to the part. 2- ITEM#7- This component should be a high frequency,low ESR capacitor. We recommend .1, or less and a ripple current rating of at least 1A. 3- ITEM#22- This component should be a 10A inductor with very high linearity. Please see Data Sheet for substitution details. 4- ITEM#12- This component should be an ultra-fast PN junction rectifier diode with a maximum Vf of 1V at 10A. 5- ITEM#11- The Bootstrap Diodes(D8,D9)should be Schottky diodes rated at least 200mA,100V,50nS. The VN10 Diode (D1) should be a Fast Recovery, switching, or Shottky diode rated at least 200mA,30V,50nS. 5 4 3 2 1 TA2022-100 tornado_32p_zip_6 VN10FBK HO2COM HO1COM VN10SW VBOOT2 VBOOT1 U2 VNSENSE FBKGND2 FBKGND1 VPSENSE FBKOUT2 FBKOUT1 31 BIASCAP OAOUT1 OAOUT2 VPP2 VPP1 VN10 INV1 INV2 REF V5 V5 L4 100uH;JWMiller 6000-101k or Toko 187LY-101J D 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 32 HMUTE PGND AGND AGND MUTE OUT2 OUT1 VNN2 VNN1 1 2 3 4 5 6 7 8 9 D D13 VN10 1 VN10FDBK D1 B1100/B C34 100uF;35v C33 0.1uF;25v C32 220uF;50V 1 D5 MURS120 1 2 D12 MURS120 2 2 2 MURS120 1 Vnsense1 Vpsense1 D11 MURS120 1 R1 3k 5V D6 LED HMUTE AGnd VN10FDBK R50 1k 2 IN2 R43 20k MUTE R44 20k R51 20K C35 3.3uF, 25V V+ C43 0.1uF;50v VC29 R48 250 1 C27 47uF;16v C42 .1uF;16V D8 B1100/B 2 2 0.1uF;100V C44 C45 0.1uF;100V R42 8.2k C49 0.1uF;16v R47 250 R32 20K AGnd C36 3.3uF, 25V IN1 R45 249k C 220uF;50V PGnd 1 V+ VC41 .1uF;16V D9 B1100/B C48 0.1uF;16v C C28 47uF;16v R31 9.1k R52 9.1k 5V R30 1k R33 1k R34 1k R35 1k Vpsense1 Vnsense1 R37 9.1k L5 11uH T68-2 Core(22AWG) Vo1a Vo2a B R41 9.1k R46 249k FBKGND1 FBKGND2 C46 330pF;50V R36 1.2k AGnd R38 1.2k R39 1.2k C47 390pF;50V R40 1.2k V- C37 0.22uF;50V R56 6;2W R57 6;2W L6 11uH T68-2 Core(22AWG) C40 0.22uF;50V B C38 0.22uF;50V PGnd C39 0.22uF;50V J10 1 2 3 4 J9 1 2 3 4 SCREW TERMINAL J1 J2 5V IN1 J3 Vo1b PGnd Vo2b PGnd VA 5V MUTE 1 2 3 HEADER 3 AGnd PGnd IN2 1 2 3 4 5 CON5 STA1 1 STANDOFF STA3 1 STANDOFF STA2 1 STANDOFF STA4 1 STANDOFF A PGnd V+ 1 2 3 4 5 6 7 CON7 AGnd Title EB-TA2022 Ver. 4.0 Size B Date: 5 4 3 2 Document Number Schematic 1 Friday, March 01, 2002 Sheet 1 Rev 4.0 1 of 1 5 4 3 2 1 C4 3.3uF R2 50k U1A LM358 2 4 PGND R19 10k 1 R17 3k VCOMP V+ VCOMP 3 7 6 + 12 1 2 D4 1N5243 PGND R4 200k 2 1 C10 0.1uF FBKGND1 D D C8 0.1uF R12 50k R3 100K VCOMP 8 1 PGND VCOMP R8 15k 3 R9 35k 5 Q2 2N7000 2 PGND HMUTE VCOMP Vo2a 9 8 3 U3C LM339 14 2 Q4 2N7000 1 1 Vo1a 4 3 U3B LM339 2 D2 1N5235 1 3 3 + - Q1 2N7000 R13 100k 1 C 12 PGND 3 12 C6 3.3uF R14 50k 11 B 3 R10 50k C9 0.1uF R11 100K PGND A 8 5 + 5 - 6 R18 10k 7 12 4 U1B LM358 + R5 80k C7 0.1uF R7 25k PGND VCOMP 4 3 - V+ D3 1n4148 1 U3A LM339 PGND R6 250k R15 50K Q3 2N3906 2 R16 300 K1 1 2 7 5 Vo2b 6 Vo1b 4 DPDT RELAY 3 8 Vo2a Vo1a 2 2 C5 22uF, 10V C PGND + - PGND VCOMP U3D LM339 13 B + - 10 PGND FBKGND2 A Title OFFSET CORRECTION & RELAY CIRCUIT Size B Date: 3 2 Document Number SCHEMATIC 2 Friday, March 01, 2002 Sheet 1 Rev 4.0 of 2 2 |
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