ZXCD50STEVAL 50W CLASS D AUDIO AMPLIFIER EVALUATION BOARD DESCRIPTION FEATURES • Stereo The ZXCD50STEVAL evaluation board is based on the ZXCD1000 Class D audio amplifier solution from Zetex. • Class D architecture 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�. • Single power supply • Output power ( Vsupply = 25V) INTRODUCTION 50W music into 4� The ZXCD50STEVAL is a 50W music power (4� load) 25W music into 8� high performance class D amplifier. The circuitry contains MOSFET devices and should therefore be • THD + N <0.5% @ 90% power handled appropriately. • >90% efficiency The board requires a single rail power supply of 13 volts minimum and 25 volts maximum. Voltages in • Flat frequency response 20Hz – 20 kHz excess of 25 volts may cause permanent damage to the board. • Turn on / turn off pop suppression The heart of the solution is the ZXCD1000 class D • Over current protection controller IC and the user should refer to the ZXCD1000 data sheet for further technical information. The circuit • Mute facility features pop suppression and over current protection as well as a 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. ISSUE 1 - JULY 2002 1 ZXCD50STEVAL CONNECTION AND OPERATION EVALUATION BOARD DESCRIPTION AND OPERATION The following PCB image shows the connections required for correct operation of the ZXCD50STEVAL The top copper , bottom copper and silk screen ID board. Simple connector blocks are provided to enable overlay are shown in figure 1,2 and 3. easy connection of the supply voltage, audio inputs and speaker outputs. The ZXCD1000 is available in a 16-pin exposed pad QSOP package. The exposed pad on the underside of Power connection the package is soldered down to an area of copper on the PCB, to function as a heatsink. To further assist heat The ZXCD50STEVAL requires a single positive supply dissipation, the PCB has plated through vias voltage: connecting to an area of copper on the underside of the board. 25V @ approximately 2.3A for 50W music into 4� The MOSFETS required on the board are Zetex ZXM64 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 series HDMOS parts. These SOT223 parts are required C2/102 should be removed to maintain a flat frequency response. to handle the power dissipation in the amplifier with a 50W music load. The supply should not exceed 25V and must not be less than 13V to ensure correct operation of the amplifier. The regulator transistors on the board are ZTX692B, Ensure the correct polarity of the supply applied. E-Line devices. These devices are required to supply the 12V rail to the channels from the board input Audio input voltage which is the 25V bridge supply. The ZXCD50STEVAL requires a single ended audio The inductors in place on the board have been selected input per channel as follows: for their excellent linearity and low losses. These components ensure minimal distortion is introduced in The input impedance is 18k�. the recovered audio signal across the full power band. Input signal amplitude required for full output power is The speaker is connected as a Bridge Tied Load (BTL). approximately 2.5V peak to peak. This means that both sides of the speaker are driven from the Output Bridge and therefore neither side of Speaker connection the speaker connects to ground. This allows maximum power to be delivered to the load, from a given supply 4� speakers may be connected to the board as shown. voltage. 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 Speaker connection Audio input Channel A Channel A Mute Speaker connection Channel B Audio input Channel B ISSUE 1 - JULY 2002 2 ZXCD50STEVAL If it is wished to view or measure the signal across the The board requires an input signal of 2.5V peak to peak load, a floating monitor must be used - for example a nominal to yield the full output power. The input differential probe. Alternatively this may be achieved impedance of the board is nominally 18k�. This may with a two channel oscilloscope monitoring the attenuate the source voltage and may need to be speaker A and speaker B outputs, and using the invert allowed for, depending on the output impedance of the and add functions. For diagnostic purposes, the source. speaker outputs can be monitored single-ended with respect to ground with an oscilloscope (or other The maximum supply voltage to the ZXCD50STEVAL instrument) if desired. However any results obtained in evaluation board is 25V nominal. A supply voltage of this manner, are not valid for assessing performance. 25V will achieve 50W music into a 4� load. The true performance depends upon some differential cancellation across the speaker load. Fig.1. Component Overlay Fig.2. Top Copper Fig.3. Bottom Copper ISSUE 1 - JULY 2002 3 ZXCD50STEVAL ZXCD50STEVAL CIRCUIT DESCRIPTION. ZXCD50STEVAL CIRCUIT PERFORMANCE Propriety circuit design and high quality magnetics are The graph shown in fig 5 indicates the typical THD necessary to yield the excellent THD performance of performance of the solution. THD is shown from zero the solution. At the heart of the circuit is the Zetex up to full power. ZXCD1000 class D audio IC. Distortion is sub 1% all the way up to full power, The ZXCD50STEVAL circuit diagram is shown in figure typically at 1W 1kHz distortion is 0.1%. 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 Figure 5. an active low input. The mute function reduces the effective output signal by 54dB. WARNING - Appropriate safety precautions should be taken by a competent person if the ZXCD100MOEVAL is to be connected The Output Bridges are built around the Zetex to any potentially hazardous equipment. 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. ISSUE 1 - JULY 2002 4 ZXCD50STEVAL Notes. ISSUE 1 - JULY 2002 5 ZXCD50STEVAL ZXCD50STEVAL ISSUE 1 - JULY 2002 ISSUE 1 - JULY 2002 6 7 ZXCD50STEVAL ZETEX CLASS D 50W STEREO DISTRIBUTOR BOARD BOM - REV1 PCB ID Value Case Specific Part Number Note Manufacturer Resistors:- R1 100k 1% 0.1W SMD 0805 Generic R2 11k 1% 0.1W SMD 0805 Generic R3 390 1% 0.1W SMD 0805 Generic R4 22k 1% 0.1W SMD 0805 Generic R5 22k 1% 0.1W SMD 0805 Generic R6 22k 1% 0.1W SMD 0805 Generic R7 390 1% 0.1W SMD 0805 Generic R8 5k6 1% 0.1W SMD 0805 Generic R9 5k6 1% 0.1W SMD 0805 Generic R10 1k5 1% 0.1W SMD 0805 Generic R11 820 1% 0.1W SMD 0805 Generic R12 47k 1% 0.1W SMD 0805 Generic R13 56 1% 0.1W SMD 0805 Generic R14 56 1% 0.1W SMD 0805 Generic R15 47k 1% 0.1W SMD 0805 Generic R16 47k 1% 0.1W SMD 0805 Generic R17 56 1% 0.1W SMD 0805 Generic R18 56 1% 0.1W SMD 0805 Generic R19 47k 1% 0.1W SMD 0805 Generic R20 0R01 1% 1W Open Air Welwyn OARS series Farnell 327-4561 R21 390 1% 0.1W SMD 0805 Generic R22 47k 1% 0.1W SMD 0805 Generic R23 47k 1% 0.1W SMD 0805 Generic R24 22k 1% 0.1W SMD 0805 Generic R25 100k 1% 0.1W SMD 0805 Generic R26 62k 1% 0.1W SMD 0805 Generic R27 11k 1% 0.1W SMD 0805 Generic R28 11k 1% 0.1W SMD 0805 Generic R29 100k 1% 0.1W SMD 0805 Generic R30 100k 1% 0.1W SMD 0805 Generic R31 51k 1% 0.1W SMD 0805 Generic R32 11k 1% 0.1W SMD 0805 Generic R33 100k 1% 0.1W SMD 0805 Generic R34 8k2 1% 0.1W SMD 0805 Generic R35 3k9 1% 0.1W SMD 0805 Generic R36 1k 1% 0.1W SMD 0805 Generic R101 100k 1% 0.1W SMD 0805 Generic R102 11k 1% 0.1W SMD 0805 Generic R103 390 1% 0.1W SMD 0805 Generic R104 22k 1% 0.1W SMD 0805 Generic R105 22k 1% 0.1W SMD 0805 Generic R106 22k 1% 0.1W SMD 0805 Generic R107 390 1% 0.1W SMD 0805 Generic R108 5k6 1% 0.1W SMD 0805 Generic R109 5k6 1% 0.1W SMD 0805 Generic R112 47k 1% 0.1W SMD 0805 Generic R113 56 1% 0.1W SMD 0805 Generic R114 56 1% 0.1W SMD 0805 Generic R115 47k 1% 0.1W SMD 0805 Generic R116 47k 1% 0.1W SMD 0805 Generic R117 56 1% 0.1W SMD 0805 Generic R118 56 1% 0.1W SMD 0805 Generic R119 47k 1% 0.1W SMD 0805 Generic R120 0R01 1% 1W Open Air OARS series Farnell 327-4561 R121 390 1% 0.1W SMD 0805 Generic R122 47k 1% 0.1W SMD 0805 Generic ISSUE 1 - JULY 2002 8 ZXCD50STEVAL ZETEX CLASS D 50W STEREO DISTRIBUTOR BOARD BOM - REV1 PCB ID Value Case Specific Part Number Note Manufacturer Resistors :- R123 47k 1% 0.1W SMD 0805 Generic R124 22k 1% 0.1W SMD 0805 Generic R125 100k 1% 0.1W SMD 0805 Generic R126 62k 1% 0.1W SMD 0805 Generic R127 11k 1% 0.1W SMD 0805 Generic R128 11k 1% 0.1W SMD 0805 Generic R132 11k 1% 0.1W SMD 0805 Generic RV1 10k 0.05W SMD 3mm Meggitt 3203 Series Cermet preset pot trimer Farnell 107-133 RV101 10k 0.05W SMD 3mm Meggitt 3203 Series Cermet preset pot trimer Farnell 107-133 Capacitors :- C1 22u ±20% 7mmHx5mmD Multicomp MCMHR Series THC 105 16VElect x2mmP Farnell 301-7564 C2 1n 50V X7R SMD 0805 Generic C3 47p 16V COG SMD 0805 Generic C4 22u ±20% 7mmHx5mmD Multicomp MCMHR Series THC 105 16V Elect x2mmP Farnell 301-7564 C5 100n 50V X7R SMD 0805 Generic C6 22u ±20% 7mmHx5mmD Multicomp MCMHR Series THC 105 16V Elect x2mmP Farnell 301-7564 C7 22u ±20% 7mmHx5mmD Multicomp MCMHR Series THC 105 16V Elect x2mmP Farnell 301-7564 C8 330p 16V COG/NPO SMD 0805 Generic C9 47n 16V X7R SMD 0805 Generic C10 47n 16V X7R SMD 0805 Generic C11 6n8 16V X7R SMD 0805 Generic C12 22u ±20% 7mmHx5mmD Multicomp MCMHR Series THC 105 16V Elect x2mmP Farnell 301-7564 C13 100n 50V X7R SMD 0805 Generic C14 6n8 16V X7R SMD 0805 Generic C15 100n 50V X7R SMD 0805 Generic C16 22u ±20% 7mmHx5mmD Multicomp MCMHR Series THC 105 16V Elect x2mmP Farnell 301-7564 C17 100n 50V X7R SMD 0805 Generic C18 22u ±20% 7mmHx5mmD Multicomp MCMHR Series THC 105 16V Elect x2mmP Farnell 301-7564 C19 100u ±20% 11mmHx6.3mmD Rubycon YXF series THC 105 16V Elect x2.5mmP Farnell 580--417 C20 1u 25V X7R SMD 1206 Generic C21 1u 25V X7R SMD 1206 Generic C22 1u 25V X7R SMD 1206 Generic C23 1u 25V X7R SMD 1206 Generic C24 470n 50V X7R SMD 1812 Generic C25 1u 63V Polyester 5mm pitch Generic C26 470n 50V X7R SMD 1812 Generic C27 1u 63V Polyester 5mm pitch Generic C28 100n 50V X7R SMD 0805 Generic C29 22u ±20% 7mmHx5mmD Multicomp MCMHR Series THC 105 16V Elect x2mmP Farnell 301-7564 C30 22u ±20% 7mmHx5mmD Multicomp MCMHR Series THC 105 16V Elect x2mmP Farnell 301-7564 C31 100n 50V X7R SMD 0805 C32 100u ±20% 11.5mmHx8mmD Rubycon ZL series THC 105 50V Elect x3.5mmP Farnell 778-679 C33 220n 50V X7R SMD 0805 Generic ISSUE 1 - JULY 2002 9 ZXCD50STEVAL ZETEX CLASS D 50W STEREO DISTRIBUTOR BOARD BOM - REV1 PCB ID Value Case Specific Part Number Note Manufacturer Capacitors :- C34 2200u ±20% 31.5mmHx16mmD Panasonic FC series THC 105 35V Elect x7.5mmP Farnell 303-6455 C35 100n 50V X7R SMD 0805 Generic C36 220u ±20% 11.5mmHx8mmD Rubycon ZL series THC 105 25V Elect x3.5mmP Farnell 762-090 C37 22u ±20% 7mmHx5mmD Multicomp MCMHR Series THC 105 16V Elect x2mmP Farnell 301-7564 C101 22u ±20% 7mmHx5mmD Multicomp MCMHR Series THC 105 16V Elect x2mmP Farnell 301-7564 C102 1n 50V X7R SMD 0805 Generic C103 47p 16V COG SMD 0805 Generic C104 22u ±20% 7mmHx5mmD Multicomp MCMHR Series THC 105 16V Elect x2mmP Farnell 301-7564 C105 100n 50V X7R SMD 0805 C106 22u ±20% 7mmHx5mmD Multicomp MCMHR Series THC 105 16V Elect x2mmP Farnell 301-7564 C107 22u ±20% 7mmHx5mmD Multicomp MCMHR Series THC 105 16V Elect x2mmP Farnell 301-7564 C109 47n 16V X7R SMD 0805 Generic C110 47n 16V X7R SMD 0805 Generic C111 6n8 16V X7R SMD 0805 Generic C112 22u ±20% 7mmHx5mmD Multicomp MCMHR Series THC 105 16V Elect x2mmP Farnell 301-7564 C113 100n 50V X7R SMD 0805 Generic C114 6n8 16V X7R SMD 0805 Generic C115 100n 50V X7R SMD 0805 Generic C116 22u ±20% 7mmHx5mmD Multicomp MCMHR Series THC 105 16V Elect x2mmP Farnell 301-7564 C117 100n 50V X7R SMD 0805 Generic C118 22u ±20% 7mmHx5mmD Multicomp MCMHR Series THC 105 16V Elect x2mmP Farnell 301-7564 C119 100u ±20% 11mmHx6.3mmD Rubycon YXF series THC105 16V Elect x2.5mmP Farnell 580-417 C120 1u 25V X7R SMD 1206 Generic C121 1u 25V X7R SMD 1206 Generic C122 1u 25V X7R SMD 1206 Generic C123 1u 25V X7R SMD 1206 Generic C124 470n 50V X7R SMD 1812 Generic C125 1u 63V Polyester 5mm pitch Generic C126 470n 50V X7R SMD 1812 Generic C127 1u 63V Polyester 5mm pitch Generic C128 100n 50V X7R SMD 0805 Generic C129 22u ±20% 7mmHx5mmD Multicomp MCMHR Series THC 105 16V Elect x2mmP Farnell 301-7564 C130 22u ±20% 7mmHx5mmD Multicomp MCMHR Series THC 105 16V Elect x2mmP Farnell 301-7564 C131 100n 50V X7R SMD 0805 C132 100u ±20% 11.5mmHx8mmD Rubycon ZL series THC 105 50V Elect x3.5mmP Farnell 778-679 C133 220n 50V X7R SMD 0805 C134 2200u ±20% 31.5mmHx16mmD Panasonic FC series THC 105 35V Elect x7.5mmP Farnell 303-6455 C135 100n 50V X7R SMD 0805 Generic ISSUE 1 - JULY 2002 10 ZXCD50STEVAL ZETEX CLASS D 50W STEREO DISTRIBUTOR BOARD BOM - REV1 PCB ID Value Case Specific Part Number Note Manufacturer Integrated Circuits U1 NE5532AD8 SMD SO8 Phillips U2 ZXCD1000EQ16 QSOP16 Zetex (Exposed Pad) U101 NE5532AD8 SMD SO8 Phillips U102 ZXCD1000EQ16 QSOP16 Zetex (Exposed Pad) Transistors Q1 FMMT591A SMD SOT23 Zetex Q2 FMMT591A SMD SOT23 Zetex Q3 FMMT591A SMD SOT23 Zetex Q4 ZVN3306F SMD SOT23 Zetex Q5 ZTX692B E Line Zetex Q6 ZXM64P035G SOT223 Zetex Q7 ZXM64N035G SOT223 Zetex Q8 ZXM64P035G SOT223 Zetex Q9 ZXM64N035G SOT223 Zetex Q10 ZXM64P035G SOT223 Zetex Q11 FMMT491A SMD SOT23 Zetex Q12 ZVN3306F SMD SOT23 Zetex Q102 FMMT591A SMD SOT23 Zetex Q103 FMMT591A SMD SOT23 Zetex Q104 ZVN3306F SMD SOT23 Zetex Q105 ZTX692B E Line Zetex Q106 ZXM64P035G SOT223 Zetex Q107 ZXM64N035G SOT223 Zetex Q108 ZXM64P035G SOT223 Zetex Q109 ZXM64N035G SOT223 Zetex Q111 FMMT491A SMD SOT23 Zetex Diodes D1 BAV70 SMD SOT23 Zetex D2 BAW56 SMD SOT23 Zetex D3 BAV70 SMD SOT23 Zetex D4 BAW56 SMD SOT23 Zetex D5 BAV70 SMD SOT23 Zetex D6 BAS16 SMD SOT23 Zetex D101 BAV70 SMD SOT23 Zetex D102 BAW56 SMD SOT23 Zetex D103 BAV70 SMD SOT23 Zetex D104 BAW56 SMD SOT23 Zetex D105 BAV70 SMD SOT23 Zetex ZD1 BZX84C13 SMD SOT23 13V Zener diode ZD101 BZX84C13 SMD SOT23 13V Zener diode Inductors :- L1 20uH PG0036 Pulse 55-8810-20 Cambion L2 20uH PG0036 Pulse 55-8810-20 Cambion L101 20uH PG0036 Pulse 55-8810-20 Cambion L102 20uH PG0036 Pulse 55-8810-20 Cambion ISSUE 1 - JULY 2002 11 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” © Zetex plc 2002 Europe Americas Asia Pacific Zetex plc Zetex GmbH Zetex Inc Zetex (Asia) Ltd Fields New Road Streitfeldstraße 19 700 Veterans Memorial Hwy 3701-04 Metroplaza, Tower 1 Chadderton D-81673 München Hauppauge, NY11788 Hing Fong Road Oldham, OL9 8NP Kwai Fong United Kingdom Germany USA Hong Kong Telephone (44) 161 622 4422 Telefon: (49) 89 45 49 49 0 Telephone: (631) 360 2222 Telephone: (852) 26100 611 Fax: (44) 161 622 4420 Fax: (49) 89 45 49 49 49 Fax: (631) 360 8222 Fax: (852) 24250 494 uk.sales@zetex.com europe.sales@zetex.com usa.sales@zetex.com 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