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AMP2-T Assembly Instructions

Summary of content (27 pages)

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AMP2-T assembly instructions. © 41Hz Audio / www.41hz.com Revision 1.0T boards TABLE OF CONTENT Assembly instructions for AMP2.................................................................................................... 3 Considerations before you start .................................................................................................. 3 Tools needed ...............................................................................................................................
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AMP2-T assembly instructions. © 41Hz Audio / www.41hz.com Revision 1.0T boards Assembly instructions for AMP2 Thank you for choosing an audio kit from 41hz.com! On delivery, check that all components have been included. If something is missing, let us know immediately. A bill of material (BOM) should have been included with your delivery and is also included here, as APPENDIX 1 Download the data sheet for the Tripath TK2350 reference board, as the schematic and layout of AMP2-T is identical.
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AMP2-T assembly instructions. © 41Hz Audio / www.41hz.com Revision 1.0T boards If you are not familiar with soldering surface mount components, it is recommended that you do some test soldering on a separate scrap piece of material. Preferably buy some simpler kit or components and practice on these. Tools needed Assembly of the kits requires the usual set of electronics working tools; soldering iron, wire cutter etc. The boards for AMP2 are triple weight, double sided copper.
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AMP2-T assembly instructions. © 41Hz Audio / www.41hz.com Revision 1.0T boards Figure 1: Top view of the PCB The numbers refer to the sections shown in Figure 1: Top view of the PCB. 1. The main component of the input section is one of the two chips in the TK2350 chipset; the TC2001 signal modulator. This chip sees only low voltages 0 and +5V. It translates analogue inputs to a digital signal train. Input and feedback resistors set the gain of the input operational amplifiers in the TC2001 chip.
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AMP2-T assembly instructions. © 41Hz Audio / www.41hz.com Revision 1.0T boards has a cooling slug that helps transporting heat to the PCB or a heat sink. There are mounting holes through the PCB for optionally using an external heat sink on top of the chip. 3. Gate drive resistors and protection diodes. These are between the driver chip and the FETs and control the switching speed and indirectly also the heat dissipated by the driver chip. Also, the current sense resistors are here. 4.
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AMP2-T assembly instructions. © 41Hz Audio / www.41hz.com Revision 1.0T boards - Connection terminals and connection wire. I recommend soldering wires to the board unless you plan to connect and disconnect them a lot. I also recommend you use the wire you plan to use in your final application right from the start. The PCB leads and wire required for connecting the power supply and speakers are heavy duty. Soldering them requires substantial heat and with repeated soldering you risk damaging the PCB.
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AMP2-T assembly instructions. © 41Hz Audio / www.41hz.com Revision 1.0T boards b. The leads of the current sense resistors R1, R2, R15, and R18. These should preferably be mounted with some standoff that helps keeping them cool. The whole supply rail current will pass through these resistors. c. Mount the gate diodes and resistors D1, D2, D3, D4, R3, R4, R11 and R12. d. Mount the other axial resistors. 7. Solder the offset trim potentiometers R104 and R204 8.
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AMP2-T assembly instructions. © 41Hz Audio / www.41hz.com f. g. h. i. j. k. Revision 1.0T boards ii. The HMUTE output can be used to control speaker output relay, via a driver circuit. The HMUTE will go high (+5V) in case the amp is muted or in case of over current, over/under voltage and other errors. Shorted outputs or shorted output transistors would also trig the over current sensing. If no errors are detected and the amp is unmated HMUTE will be low (0V).
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AMP2-T assembly instructions. © 41Hz Audio / www.41hz.com Revision 1.0T boards c. There are three low ESR 100uF (150 uF) 35V for the onboard V10 PWM supply. These are the C300, C19 and C71. d. There are two 47uF for the bootstrap circuitry, C17 and C18. 11. Solder the inductor L4 and the Q1 MOSFET for the V10 supply. 12. Wind the toroid inductors. You should use 29 turns of 1.2 or 1.3 mm enamel insulated wire for the T108-2 toroids included in the kit. The inductance should be 11 uH.
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AMP2-T assembly instructions. © 41Hz Audio / www.41hz.com - - - - Revision 1.0T boards Ground the signal inputs to signal ground (connect IN1 and IN2 to AGND on connector J2). Do NOT connect the speakers yet. Connect the +5V supply and its ground. A 100 mA fast fuse is recommended. Important; If the +5V supply is higher than 6V the chipset will be permanently damaged. The 5V supply should be well stabilized and filtered.
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AMP2-T assembly instructions. © 41Hz Audio / www.41hz.com • Revision 1.0T boards Audio signal sources and the 5V supply must be grounded to J2. This connector is in turn connected via an inductor bead to the star grounding point where the power supply is connected. If you have any questions, write any questions on the forum on our web site http://www.support.41hz.com , as the questions may be of general interest. For any questions please do not hesitate to contact us at jan@41hz.
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AMP2-T assembly instructions. © 41Hz Audio / www.41hz.com Figure 3: Components top view Figure 4: Jumper J1 BBM settings Revision 1.
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AMP2-T assembly instructions. © 41Hz Audio / www.41hz.com APPENDIX 1: Bill Of Materials (BOM) *** Count (R) 4 (C) 11 (C) 4 (C) 2 (C) 2 (C) 2 (R) 4 (R) 1 (R) 9 (C) 2 (R) 4 (R) 1 (R) 2 (R) 1 (R) 6 (R) 4 (R) 5 (R) 2 (C) 2 (C) 2 (R) 2 (C) 1 (C) 1 (C) 3 (L) 1 (C) 1 (C) 2 (R) 2 (C) 2 (C) 2 (C) 1 (C) 4 (R) 1 (R) 2 (R) 4 (L) 1 (Q) 1 (M) 4 (D) 8 (D) 6 (R) 2 (D) 1 (U) 1 (L) 2 (U) 1 (Board) 1 Value 0.01 ohm 0.1 uF 50V 0.1 uF 100V ceramic 0.1 uF 100V (250V) 0.1 uF 250V 0.22 uF 100V (250V) 1.1 K 1.
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AMP2-T assembly instructions. © 41Hz Audio / www.41hz.com Revision 1.0T boards BOM by component symbol / component name Symbol C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 C12 C13 C14 C15 C16 C17 C18 C19 C20 C27 C29 C30 C31 C32 C35 C40 C5A1 C60 C71 C100 C103 C107 C200 C101 C201 C203 C207 C300 C301 C332 D1 D2 D3 D4 D5 D6 D7 Value 0.1 uF 100V 0.1 uF 100V 0.1 uF 250V 0.1 uF 250V 0.22 uF 100V 33 uF 160V 33 uF 160V 0.22 uF 100V 0.22 uF 100V 0.22 uF 100V 0.1 uF 100V 0.1 uF 100V 0.1 uF 50V 0.1 uF 50V 0.1 uF 50V 0.
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AMP2-T assembly instructions. © 41Hz Audio / www.41hz.com D8 D9 D10 D11 D21 D22 D23 D24 L1 L2 L3 (FB) L10 M1 M2 M3 M4 Q1 R1 R11 R2 R12 R3 R4 R5 R6 R7 R8 R9 R10 R13 R14 R15 R16 R17 R18 R19 R20 R22 R30 R31 R32 R100 R101 R104 R105 R106 R107 R108 R109 R110 R111 R112 R113 MURS120 MURS120 MURS120 Schottky 1A 100V MUR120 MUR120 MUR120 MUR120 Toroid 11uH Toroid 11uH Ferrite bead 100 uH MOSFET MOSFET MOSFET MOSFET IRF9510 0.01 ohm 15 ohm 0.01 ohm 15 ohm 15 ohm 15 ohm 510 K 510 K 2.2 ohm 2.
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AMP2-T assembly instructions. © 41Hz Audio / www.41hz.com R114 R115 R120 R122 R200 R201 R204 R205 R206 R207 R208 R209 R210 R211 R222 R300 R301 R33 U1 U2 1.18 M 392 K 8.2 K 10 K 49.9 k 20 K Pot 50K 1K 15 K 1.1 K 1K 15 K 1.1 K 20 K 10 K 10 ohm 1K ----TP2350B TC2001 SMT 0805 SMT 0805 SMT 0805 SMT 0805 SMT 0805 SMT 0805 TRIM_3_RM5_D6 SMT 0805 SMT 0805 SMT 0805 SMT 0805 SMT 0805 SMT 0805 SMT 0805 SMT 0805 SMT 0805 SMT 0805 SMT0805 64PIN-LQFP SOIC28MIC Revision 1.
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AMP2-T assembly instructions. © 41Hz Audio / www.41hz.com Revision 1.0T boards APPENDIX 2: Fine tuning the AMP2 The components included in the AMP2 kit work well for many users. For optimal performance the AMP2 board may be fine tuned to each application. Here is a summary of what to think of. Input impedance, input gain The TK2350 can be described as a two stage amplifier. The first is an operational amplifier while the second is the power stage / modulator.
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AMP2-T assembly instructions. © 41Hz Audio / www.41hz.com Revision 1.0T boards Consumer audio With +10 dB pre-amp Pro audio +4dBU Value in AMP2 kit Nominal VinRMS AMP2 Gain Rin Rfeedback 0.316 1 50 KΩ 50 KΩ 0.775 1 50 KΩ 50 KΩ 1.23 0.4 50 KΩ 20 KΩ 1.23 0.
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AMP2-T assembly instructions. © 41Hz Audio / www.41hz.com Revision 1.0T boards combine into half the equivalent value, increasing the corner frequency. It can also be noted that the Tripath boards and measurement results given in the Tripath data sheets are usually done with standard electrolyte capacitors as input caps. Modulator gain The AMP2 and TK2350 is a feedback topology.
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AMP2-T assembly instructions. © 41Hz Audio / www.41hz.com Revision 1.0T boards Calculating the over current sense resistor values Description Current limit trip point Component 6A 10A 12A 16A 22A Isc Over-current trip point 0.01 Ω 0.01 Ω 0.01Ω 0.01Ω 0.01Ω R51, R52, R53, R54 Rsense Current sense resistor 20K 18K 15K 12K R111, R211 Rorc =3473/(Rsense* Isc+0.0716) 27K Voltage limiting The TK2350 chipset also has over / under voltage sensing. The voltage values are set with four resistors in the 0805 size.
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AMP2-T assembly instructions. © 41Hz Audio / www.41hz.com Revision 1.0T boards APPENDIX 3: Mounting the TP2350B chip The TP2350B driver chip can produce some heat, especially if driving MOSFETs with high gate charges and / or at high rail voltages. The chip has a slug on the bottom side that enhances the heat transfer from the chip. The AMP2 PCB has a corresponding area with a number of holes / vias that lead heat from the chip to the back of the PCB.
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AMP2-T assembly instructions. © 41Hz Audio / www.41hz.com Revision 1.0T boards Most Zn-PB solder will melt at around 180ºC. The TP2350B chip is tested for soldering for 10 seconds in 260ºC so you have some margin. Subjecting the chip to high temperatures for a prolonged time may damage the chip. The TC2001 chip does not have a heat slug and does not require a heat sink. APPENDIX 4: Connector pinouts • • • Mute jumper; close to awake the amp The V5-agnd must be well stabilized / filtered.
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AMP2-T assembly instructions. © 41Hz Audio / www.41hz.com APPENDIX 5: Power supply board for the AMP2 amplifier Coming… Revision 1.