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ZXCD50STEVAL
50W CLASS D AUDIO AMPLIFIER EVALUATION BOARD
DESCRIPTION
The ZXCD50STEVAL evaluation board is based on the ZXCD1000 Class D audio amplifier solution from Zetex. This board allows the user to evaluate the high fidelity audio performance offered by the Zetex solution, with an output power up to 50W music power into 4 .
FEATURES
* Stereo * Class D architecture * Single power supply * Output power ( Vsupply = 25V)
50W music into 4 25W music into 8
INTRODUCTION
The ZXCD50STEVAL is a 50W music power (4 load) high performance class D amplifier. The circuitry contains MOSFET devices and should therefore be handled appropriately. The board requires a single rail power supply of 13 volts minimum and 25 volts maximum. Voltages in excess of 25 volts may cause permanent damage to the board. The heart of the solution is the ZXCD1000 class D controller IC and the user should refer to the ZXCD1000 data sheet for further technical information. The circuit features pop suppression and over current protection as well as a mute facility.
* THD + N <0.5% @ 90% power * >90% efficiency * Flat frequency response 20Hz - 20 kHz * Turn on / turn off pop suppression * Over current protection * Mute facility * Noise floor -115dB
Note: The ZXCD50STEVAL is intended as an evaluation platform for Zetex Class D solutions. Zetex accepts no liability for external equipment connected to the ZXCD500STEVAL or any other form of consequential damage or loss.
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CONNECTION AND OPERATION
The following PCB image shows the connections required for correct operation of the ZXCD50STEVAL board. Simple connector blocks are provided to enable easy connection of the supply voltage, audio inputs and speaker outputs. Power connection The ZXCD50STEVAL requires a single positive supply voltage: 25V @ approximately 2.3A for 50W music into 4
Note: 8 speakers can be used in this application. In this case a 25V bridge supply will result in an output power of 25W music. If this is required then C2/102 should be removed to maintain a flat frequency response.
EVALUATION BOARD DESCRIPTION AND OPERATION
The top copper , bottom copper and silk screen ID overlay are shown in figure 1,2 and 3. The ZXCD1000 is available in a 16-pin exposed pad QSOP package. The exposed pad on the underside of the package is soldered down to an area of copper on the PCB, to function as a heatsink. To further assist heat dissipation, the PCB has plated through vias connecting to an area of copper on the underside of the board. The MOSFETS required on the board are Zetex ZXM64 series HDMOS parts. These SOT223 parts are required to handle the power dissipation in the amplifier with a 50W music load. The regulator transistors on the board are ZTX692B, E-Line devices. These devices are required to supply the 12V rail to the channels from the board input voltage which is the 25V bridge supply. The inductors in place on the board have been selected for their excellent linearity and low losses. These components ensure minimal distortion is introduced in the recovered audio signal across the full power band. The speaker is connected as a Bridge Tied Load (BTL). This means that both sides of the speaker are driven from the Output Bridge and therefore neither side of the speaker connects to ground. This allows maximum power to be delivered to the load, from a given supply voltage.
The supply should not exceed 25V and must not be less than 13V to ensure correct operation of the amplifier. Ensure the correct polarity of the supply applied. Audio input The ZXCD50STEVAL requires a single ended audio input per channel as follows: The input impedance is 18k . Input signal amplitude required for full output power is approximately 2.5V peak to peak. Speaker connection 4 speakers may be connected to the board as shown. The correct polarity connection of the speakers is essential to avoid phasing errors.
Note: 8 speakers can be used in this application. If this is required then C2/102 should be removed to maintain a flat frequency response. Over current protection is provided on the board, which prevents damage to the circuit with shorts from the speaker to ground or across the speaker.
Power connection Audio input Channel A Speaker connection Channel A
Mute Speaker connection Channel B Audio input Channel B
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If it is wished to view or measure the signal across the load, a floating monitor must be used - for example a differential probe. Alternatively this may be achieved with a two channel oscilloscope monitoring the speaker A and speaker B outputs, and using the invert and add functions. For diagnostic purposes, the speaker outputs can be monitored single-ended with respect to ground with an oscilloscope (or other instrument) if desired. However any results obtained in this manner, are not valid for assessing performance. The true performance depends upon some differential cancellation across the speaker load. The board requires an input signal of 2.5V peak to peak nominal to yield the full output power. The input impedance of the board is nominally 18k . This may attenuate the source voltage and may need to be allowed for, depending on the output impedance of the source. The maximum supply voltage to the ZXCD50STEVAL evaluation board is 25V nominal. A supply voltage of 25V will achieve 50W music into a 4 load.
Fig.1. Component Overlay
Fig.2. Top Copper
Fig.3. Bottom Copper
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ZXCD50STEVAL CIRCUIT DESCRIPTION.
Propriety circuit design and high quality magnetics are necessary to yield the excellent THD performance of the solution. At the heart of the circuit is the Zetex ZXCD1000 class D audio IC. The ZXCD50STEVAL circuit diagram is shown in figure 4. The board features two class D channels, one master and one slave. These channels are essentially the same other than the triangle synchronisation facilitated by Q1 on the master channel. Each audio channel consists of an input phase splitter, the ZXCD1000, an output bridge to drive the load - via L-C filters, and an over-current protection circuit. Each channel also features its own dropper voltage regulator. The voltage regulator (Q5/105, ZD1/101 etc.) is necessary to drop higher supply voltages (25V on the bridge for 50W) to a level suitable for the ZXCD1000 and input phase splitter (12V on the board). The input phase splitter per channel, built around the NE5532 dual op amp, is necessary to drive the Audio A and Audio B channels on each ZXCD1000. Each channel phase splitter features a mute transistor (Q11/111) which is controlled via the circuit built around Q12. This circuit provides a mute function with an active low input. The mute function reduces the effective output signal by 54dB. The Output Bridges are built around the Zetex ZXM64P035G and ZXM64N035G PMOS and NMOS SOT223 transistors. The circuit built around Q10 facilitates a slow start for the bridge supply voltage This circuit performs anti-pop for the solution. R20/120 are over current sense resistors. The circuit built around these (Q2/102, Q3/103 etc) enables an over-current protection for the solution. In fault conditions the circuit disables the triangle modulation waveform to the channel and thus disables the output bridge. Protection is given for speaker shorts and speaker to ground shorts. The ZXCD1000 outputs drive Output Bridge MOSFET's, with the PWM signal, which subsequently drives the load via L-C filters. The purpose of the filters is to low pass filter the high frequency switching PWM signal from the bridge. Thus the lower frequency audio signal is recovered and is available at the speaker outputs.
ZXCD50STEVAL CIRCUIT PERFORMANCE
The graph shown in fig 5 indicates the typical THD performance of the solution. THD is shown from zero up to full power. Distortion is sub 1% all the way up to full power, typically at 1W 1kHz distortion is 0.1%.
Figure 5.
WARNING - Appropriate safety precautions should be taken by a competent person if the ZXCD100MOEVAL is to be connected to any potentially hazardous equipment.
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Notes.
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ZXCD50STEVAL
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ZXCD50STEVAL
ZETEX CLASS D 50W STEREO DISTRIBUTOR BOARD BOM - REV1
PCB ID Value Case Specific Manufacturer Part Number Note Resistors:R1 100k R2 11k R3 390 R4 22k R5 22k R6 22k R7 390 R8 5k6 R9 5k6 R10 1k5 R11 820 R12 47k R13 56 R14 56 R15 47k R16 47k R17 56 R18 56 R19 47k R20 0R01 R21 R22 R23 R24 R25 R26 R27 R28 R29 R30 R31 R32 R33 R34 R35 R36 R101 R102 R103 R104 R105 R106 R107 R108 R109 R112 R113 R114 R115 R116 R117 R118 R119 R120 R121 R122 390 47k 47k 22k 100k 62k 11k 11k 100k 100k 51k 11k 100k 8k2 3k9 1k 100k 11k 390 22k 22k 22k 390 5k6 5k6 47k 56 56 47k 47k 56 56 47k 0R01 390 47k
1% 0.1W 1% 0.1W 1% 0.1W 1% 0.1W 1% 0.1W 1% 0.1W 1% 0.1W 1% 0.1W 1% 0.1W 1% 0.1W 1% 0.1W 1% 0.1W 1% 0.1W 1% 0.1W 1% 0.1W 1% 0.1W 1% 0.1W 1% 0.1W 1% 0.1W 1% 1W 1% 0.1W 1% 0.1W 1% 0.1W 1% 0.1W 1% 0.1W 1% 0.1W 1% 0.1W 1% 0.1W 1% 0.1W 1% 0.1W 1% 0.1W 1% 0.1W 1% 0.1W 1% 0.1W 1% 0.1W 1% 0.1W 1% 0.1W 1% 0.1W 1% 0.1W 1% 0.1W 1% 0.1W 1% 0.1W 1% 0.1W 1% 0.1W 1% 0.1W 1% 0.1W 1% 0.1W 1% 0.1W 1% 0.1W 1% 0.1W 1% 0.1W 1% 0.1W 1% 0.1W 1% 1W 1% 0.1W 1% 0.1W
SMD 0805 SMD 0805 SMD 0805 SMD 0805 SMD 0805 SMD 0805 SMD 0805 SMD 0805 SMD 0805 SMD 0805 SMD 0805 SMD 0805 SMD 0805 SMD 0805 SMD 0805 SMD 0805 SMD 0805 SMD 0805 SMD 0805 Open Air SMD 0805 SMD 0805 SMD 0805 SMD 0805 SMD 0805 SMD 0805 SMD 0805 SMD 0805 SMD 0805 SMD 0805 SMD 0805 SMD 0805 SMD 0805 SMD 0805 SMD 0805 SMD 0805 SMD 0805 SMD 0805 SMD 0805 SMD 0805 SMD 0805 SMD 0805 SMD 0805 SMD 0805 SMD 0805 SMD 0805 SMD 0805 SMD 0805 SMD 0805 SMD 0805 SMD 0805 SMD 0805 SMD 0805 Open Air SMD 0805 SMD 0805
Generic Generic Generic Generic Generic Generic Generic Generic Generic Generic Generic Generic Generic Generic Generic Generic Generic Generic Generic Welwyn OARS series Farnell 327-4561 Generic Generic Generic Generic Generic Generic Generic Generic Generic Generic Generic Generic Generic Generic Generic Generic Generic Generic Generic Generic Generic Generic Generic Generic Generic Generic Generic Generic Generic Generic Generic Generic Generic OARS series Farnell 327-4561 Generic Generic
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ZETEX CLASS D 50W STEREO DISTRIBUTOR BOARD BOM - REV1
PCB ID Value Case Specific Manufacturer Part Number Note Resistors :R123 47k R124 22k R125 100k R126 62k R127 11k R128 11k R132 11k RV1 10k RV101 10k
1% 0.1W 1% 0.1W 1% 0.1W 1% 0.1W 1% 0.1W 1% 0.1W 1% 0.1W 0.05W 0.05W
SMD 0805 SMD 0805 SMD 0805 SMD 0805 SMD 0805 SMD 0805 SMD 0805 SMD 3mm preset pot SMD 3mm preset pot 7mmHx5mmD x2mmP SMD 0805 SMD 0805 7mmHx5mmD x2mmP SMD 0805 7mmHx5mmD x2mmP 7mmHx5mmD x2mmP SMD 0805 SMD 0805 SMD 0805 SMD 0805 7mmHx5mmD x2mmP SMD 0805 SMD 0805 SMD 0805 7mmHx5mmD x2mmP SMD 0805 7mmHx5mmD x2mmP 11mmHx6.3mmD x2.5mmP SMD 1206 SMD 1206 SMD 1206 SMD 1206 SMD 1812 5mm pitch SMD 1812 5mm pitch SMD 0805 7mmHx5mmD x2mmP 7mmHx5mmD x2mmP SMD 0805 11.5mmHx8mmD x3.5mmP SMD 0805
Generic Generic Generic Generic Generic Generic Generic Meggitt Meggitt 3203 Series Cermet trimer Farnell 107-133 3203 Series Cermet trimer Farnell 107-133 MCMHR Series Farnell 301-7564 MCMHR Series Farnell 301-7564 MCMHR Series Farnell 301-7564 MCMHR Series Farnell 301-7564 THC 105 Generic Generic THC 105 Generic THC 105 THC 105 Generic Generic Generic Generic THC 105 Generic Generic Generic THC 105 Generic THC 105 THC 105 Generic Generic Generic Generic Generic Generic Generic Generic Generic THC 105 THC 105 THC 105 Generic
Capacitors :C1 22u C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 C12 C13 C14 C15 C16 C17 C18 C19 C20 C21 C22 C23 C24 C25 C26 C27 C28 C29 C30 C31 C32 C33 1n 47p 22u 100n 22u 22u 330p 47n 47n 6n8 22u 100n 6n8 100n 22u 100n 22u 100u 1u 1u 1u 1u 470n 1u 470n 1u 100n 22u 22u 100n 100u 220n
20% 16VElect 50V X7R 16V COG 20% 16V Elect 50V X7R 20% 16V Elect 20% 16V Elect 16V COG/NPO 16V X7R 16V X7R 16V X7R 20% 16V Elect 50V X7R 16V X7R 50V X7R 20% 16V Elect 50V X7R 20% 16V Elect 20% 16V Elect 25V X7R 25V X7R 25V X7R 25V X7R 50V X7R 63V Polyester 50V X7R 63V Polyester 50V X7R 20% 16V Elect 20% 16V Elect 50V X7R 20% 50V Elect 50V X7R
Multicomp
Multicomp Multicomp Multicomp
Multicomp
MCMHR Series Farnell 301-7564
Multicomp Multicomp Rubycon
MCMHR Series Farnell 301-7564 MCMHR Series Farnell 301-7564 YXF series Farnell 580--417
Multicomp Multicomp Rubycon
MCMHR Series Farnell 301-7564 MCMHR Series Farnell 301-7564 ZL series Farnell 778-679
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ZETEX CLASS D 50W STEREO DISTRIBUTOR BOARD BOM - REV1
PCB ID Value Case Specific Manufacturer Panasonic Rubycon Multicomp Multicomp Part Number Note Capacitors :C34 2200u 20% 35V Elect C35 100n 50V X7R C36 220u 20% 25V Elect C37 22u 20% 16V Elect C101 22u 20% 16V Elect C102 1n 50V X7R C103 47p 16V COG C104 22u 20% 16V Elect C105 100n 50V X7R C106 22u 20% 16V Elect C107 22u 20% 16V Elect C109 47n 16V X7R C110 47n 16V X7R C111 6n8 16V X7R C112 22u 20% 16V Elect C113 100n 50V X7R C114 6n8 16V X7R C115 100n 50V X7R C116 22u 20% 16V Elect C117 100n 50V X7R C118 22u 20% 16V Elect C119 100u 20% 16V Elect C120 1u 25V X7R C121 1u 25V X7R C122 1u 25V X7R C123 1u 25V X7R C124 470n 50V X7R C125 1u 63V Polyester C126 470n 50V X7R C127 1u 63V Polyester C128 100n 50V X7R C129 22u 20% 16V Elect C130 22u 20% 16V Elect C131 100n 50V X7R C132 100u 20% 50V Elect C133 220n 50V X7R C134 2200u 20% 35V Elect C135 100n 50V X7R
31.5mmHx16mmD x7.5mmP SMD 0805 11.5mmHx8mmD x3.5mmP 7mmHx5mmD x2mmP 7mmHx5mmD x2mmP SMD 0805 SMD 0805 7mmHx5mmD x2mmP SMD 0805 7mmHx5mmD x2mmP 7mmHx5mmD x2mmP SMD 0805 SMD 0805 SMD 0805 7mmHx5mmD x2mmP SMD 0805 SMD 0805 SMD 0805 7mmHx5mmD x2mmP SMD 0805 7mmHx5mmD x2mmP 11mmHx6.3mmD x2.5mmP SMD 1206 SMD 1206 SMD 1206 SMD 1206 SMD 1812 5mm pitch SMD 1812 5mm pitch SMD 0805 7mmHx5mmD x2mmP 7mmHx5mmD x2mmP SMD 0805 11.5mmHx8mmD x3.5mmP SMD 0805 31.5mmHx16mmD x7.5mmP SMD 0805
FC series Farnell 303-6455 ZL series Farnell 762-090 MCMHR Series Farnell 301-7564 MCMHR Series Farnell 301-7564 MCMHR Series Farnell 301-7564 MCMHR Series Farnell 301-7564 MCMHR Series Farnell 301-7564
THC 105 Generic THC 105 THC 105 THC 105 Generic Generic THC 105 THC 105 THC 105 Generic Generic Generic THC 105 Generic Generic Generic THC 105 Generic THC 105 THC105 Generic Generic Generic Generic Generic Generic Generic Generic Generic THC 105 THC 105 THC 105 THC 105 Generic
Multicomp Multicomp Multicomp
Multicomp
MCMHR Series Farnell 301-7564
Multicomp Multicomp Rubycon
MCMHR Series Farnell 301-7564 MCMHR Series Farnell 301-7564 YXF series Farnell 580-417
Multicomp Multicomp Rubycon Panasonic
MCMHR Series Farnell 301-7564 MCMHR Series Farnell 301-7564 ZL series Farnell 778-679 FC series Farnell 303-6455
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ZXCD50STEVAL
ZETEX CLASS D 50W STEREO DISTRIBUTOR BOARD BOM - REV1
PCB ID Value Case Specific Manufacturer Phillips Zetex Phillips Zetex Part Number Note Integrated Circuits U1 NE5532AD8 U2 ZXCD1000EQ16 U101 U102 NE5532AD8 ZXCD1000EQ16
SMD SO8 QSOP16 (Exposed Pad) SMD SO8 QSOP16 (Exposed Pad) SMD SOT23 SMD SOT23 SMD SOT23 SMD SOT23 E Line SOT223 SOT223 SOT223 SOT223 SOT223 SMD SOT23 SMD SOT23 SMD SOT23 SMD SOT23 SMD SOT23 E Line SOT223 SOT223 SOT223 SOT223 SMD SOT23 SMD SOT23 SMD SOT23 SMD SOT23 SMD SOT23 SMD SOT23 SMD SOT23 SMD SOT23 SMD SOT23 SMD SOT23 SMD SOT23 SMD SOT23 SMD SOT23 SMD SOT23 PG0036 55-8810-20 PG0036 55-8810-20 PG0036 55-8810-20 PG0036 55-8810-20
Transistors Q1 FMMT591A Q2 FMMT591A Q3 FMMT591A Q4 ZVN3306F Q5 ZTX692B Q6 ZXM64P035G Q7 ZXM64N035G Q8 ZXM64P035G Q9 ZXM64N035G Q10 ZXM64P035G Q11 FMMT491A Q12 ZVN3306F Q102 FMMT591A Q103 FMMT591A Q104 ZVN3306F Q105 ZTX692B Q106 ZXM64P035G Q107 ZXM64N035G Q108 ZXM64P035G Q109 ZXM64N035G Q111 FMMT491A Diodes D1 BAV70 D2 BAW56 D3 BAV70 D4 BAW56 D5 BAV70 D6 BAS16 D101 BAV70 D102 BAW56 D103 BAV70 D104 BAW56 D105 BAV70 ZD1 BZX84C13 ZD101 BZX84C13 Inductors :L1 20uH L2 L101 L102 20uH 20uH 20uH
Zetex Zetex Zetex Zetex Zetex Zetex Zetex Zetex Zetex Zetex Zetex Zetex Zetex Zetex Zetex Zetex Zetex Zetex Zetex Zetex Zetex Zetex Zetex Zetex Zetex Zetex Zetex Zetex Zetex Zetex Zetex Zetex 13V Zener diode 13V Zener diode Pulse Cambion Pulse Cambion Pulse Cambion Pulse Cambion
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ZXCD50STEVAL
This publication is issued to provide outline information only which (unless agreed by the Company in writing) may not be used, applied or reproduced for any purposes or form part of any order or contract or be regarded as representation relating to the products or services concerned. The company reserves the right to alter without notice the specification, design, price or conditions of supply of any product or service. Some changes to earlier published data may have been made, data presented in this handbook supersedes all previous specifications. The information contained in this publication has been carefully checked and is considered to be accurate, but no responsibility is assumed for any inaccuracies. Zetex makes no warranty, representation or guarantee regarding the suitability of the products and circuits in this publication for any given purpose; nor does Zetex assume any liability arising from the use or application of any these products or circuits and specifically disclaims any and all incidental damages. Zetex products are specifically not authorised for use as critical components in life support devices or systems without the express written approval of the Managing Director of Zetex plc. As used herein a. Life support devices or systems are devices or systems which (1) are intended to implant into the body, or (2) support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labelling can be reasonable expected to result in significant injury to the user. b. A critical component is any component on a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or to affect its safety or effectiveness. E. & O.E. "all rights reserved"
(c) Zetex plc 2002
Europe Zetex plc Fields New Road Chadderton Oldham, OL9 8NP United Kingdom Telephone (44) 161 622 4422 Fax: (44) 161 622 4420 uk.sales@zetex.com Zetex GmbH Streitfeldstrae 19 D-81673 Munchen Germany Telefon: (49) 89 45 49 49 0 Fax: (49) 89 45 49 49 49 europe.sales@zetex.com Americas Zetex Inc 700 Veterans Memorial Hwy Hauppauge, NY11788 USA Telephone: (631) 360 2222 Fax: (631) 360 8222 usa.sales@zetex.com Asia Pacific Zetex (Asia) Ltd 3701-04 Metroplaza, Tower 1 Hing Fong Road Kwai Fong Hong Kong Telephone: (852) 26100 611 Fax: (852) 24250 494 asia.sales@zetex.com
These offices are supported by agents and distributors in major countries world-wide. This publication is issued to provide outline information only which (unless agreed by the Company in writing) may not be used, applied or reproduced for any purpose or form part of any order or contract or be regarded as a representation relating to the products or services concerned. The Company reserves the right to alter without notice the specification, design, price or conditions of supply of any product or service. For the latest product information, log on to
www.zetex.com ISSUE 1 - JULY 2002 12

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