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| ZXCD100MOEVAL 100W CLASS D AUDIO AMPLIFIER EVALUATION BOARD DESCRIPTION The ZXCD100MOEVAL 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 upto 100W into 4 . FEATURES * Class D architecture * Single power supply * Output power ( Vsupply = 35V) 100 W into 4 INTRODUCTION The ZXCD100MOEVAL is a 100W RMS (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 35 volts maximum. Voltages in excess of 35 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. * THD + N <0.8% @ 90% power * >90% efficiency * Flat frequency response 20Hz - 20 kHz * Turn on / turn off pop suppression * Over current protection * Noise floor -115dB Note: The ZXCD100MOEVAL is intended as an evaluation platform for Zetex Class D solutions. Zetex accepts no liability for external equipment connected to the ZXCD100MOEVAL or any other form of consequential damage or loss. ISSUE 2 - JULY 2002 1 ZXCD100MOEVAL CONNECTION AND OPERATION The following PCB image shows the connections required for correct operation of the ZXCD100MOEVAL board. Simple connector blocks are provided to enable easy connection of the supply voltage, audio input and speaker output. Power connection The ZXCD100MOEVAL requires a single positive supply voltage: 35V @ approximately 3.3A for 100W in 4 The supply should not exceed 35V and must not be less than 13V to ensure correct operation of the amplifier, Ensure the correct polarity of the supply is applied. Audio input The ZXCD100MOEVAL requires a single ended audio input as follows: The input impedance is 18k Input signal amplitude required for full output power is approximately 2.5V peak to peak. Speaker connection A 4 speaker may be connected to the board as shown. If this board is being used as part of a multi-channel solution the ensure the correct polarity connection of the speaker to avoid phasing errors. EVALUATION BOARD DESCRIPTION AND OPERATION The top copper, bottom copper and silk screen ID overlay are shown in figures 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 heat sink. 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 TO220 parts are required to handle the power dissipation in the amplifier with a 100W load. The output bridge is approximately 90% efficient, leaving in the region of 2.5W per MOSFET at full power. Heat sinks are provided on the board to enable this dissipation with a minimised temperature rise. The regulator transistor on the board is a TIP120, TO220 device. This device is required to supply the 12V rail to the board with its input voltage being the 35V bridge supply. A heat sink is attached to the transistor to enable good dissipation of the heat generated in this device. 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. Audio Input Speaker Connection Power Connection ISSUE 2 - JULY 2002 2 ZXCD100MOEVAL 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. 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. T h e m a x i m u m su p p l y v o l t a g e t o t h e ZXCD100MOEVAL evaluation board is 35V nominal. A supply voltage of 35V will achieve 100W into a 4 load. With the suggested heat sinking in place this board can easily operate with a full 100W output for extended periods. The full power output voltage across the (bridge tied) load will be approximately 60V peak to peak with a supply voltage of 35V. Viewing outputs single-ended will yield half these voltages. Smaller input voltages will yield smaller output voltages. Fig.1. Component Overlay Fig.2. Top Copper Fig.3. Bottom Copper ISSUE 2 - JULY 2002 3 ZXCD100MOEVAL ZXCD100MOEVAL 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 ZXCD100MOEVAL circuit diagram is shown in figure 4. The circuit consists of a voltage regulator, an input phase splitter, the ZXCD1000, an output bridge to drive the load - via L-C filters, an anti-pop slow start circuit and an over-current protection circuit. (Note components are shown also for an over-temperature circuit however this circuit is application dependant and is not used on the demonstration board) The voltage regulator (Q5, ZD5 etc.) is necessary to drop higher supply voltages (35V on the bridge for 100W) to a level suitable for the ZXCD1000 and input phase splitter (12V on the board). The input phase splitter, built around the NE5532 dual op amp, is necessary to drive the Audio A and Audio B channels on the ZXCD1000. The Output Bridge is built around the Zetex ZXM64P035L3 and ZXM64N035L3 PMOS and NMOS TO220 transistors. Q10 and its associated compnents facilitate a slow start for the bridge supply voltage This circuit performs anti-pop for the solution. R28 is an over current sense resistor. The circuit shown (Q6, Q8 etc) enables an over-current protection for the solution. In fault conditions the circuit disables the triangle modulation waveform 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 this network 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. WARNING - Appropriate safety precautions should be taken by a competent person if the ZXCD100MOEVAL is to be connected to any potentially hazardous equipment. ZXCD100MOEVAL CIRCUIT PERFORMANCE The graph shown in fig 5 indicates the THD performance of the 100W 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 0.4%. ISSUE 2 - JULY 2002 4 ZXCD100MOEVAL ZETEX CLASS D 100W MONO BOARD BOM (Manufactures names and series numbers are given for component specification guidance only) PCB ID Resistors :R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 R11 R12 R13 R14 R15 R16 R17 R18 R19 R20 R21 R22 R23 R24 R25 R26 R27 R28 R29 R30 R31 R32 R33 R34 11k 47k 56R 47k 56R 47k 56R 56R 47k 22k 5k6 5k6 22k 22k 390R 390R 5k6 11k 10K 62k 100k 100k 100k 18k 820R 33k 0.01 100k 82k SMD 0805 5% 0.1w SMD 0805 5% 0.1w SMD 0805 5% 0.1w SMD 0805 5% 0.1w SMD 0805 5% 0.1w SMD 0805 5% 0.1w SMD 0805 5% 0.1w SMD 0805 5% 0.1w SMD 0805 5% 0.1w SMD 0805 5% 0.1w SMD 0805 5% 0.1w SMD 0805 5% 0.1w SMD 0805 5% 0.1w SMD 0805 5% 0.1w SMD 0805 5% 0.1w SMD 0805 5% 0.1w Not Used SMD 0805 5% 0.1w SMD 0805 5% 0.1w SMD 3mm Pot SMD 0805 5% 0.1w SMD 0805 5% 0.1w SMD 0805 5% 0.1w SMD 0805 5% 0.1w SMD 0805 5% 0.1w SMD 0805 5% 0.1w SMD 0805 5% 0.1w Open Air SMD 0805 5% 0.1w SMD 0805 5% 0.1w Optional trim component Optional trim component Meggitt 3203 series Optional trim component Value Case Notes Welwyn OARS series Not Used Not Used Not Used Not Used Capacitors :(The following Capacitor voltage ratings should be as specified or greater) (Electrolytic, COG, X7R and polyester refer to the dielectric material) (A more stable dielectric may be used as an alternative to that specified in all cases) (TH 105C = Through - hole radial, max operating temp. 105 deg.C) C1 47pF COG 16V SMD 0805 C2 22 F 16V Elect. 20% TH 105C 7mmHx5mmDx2mmP C3 22 F 16V Elect. 20% TH 105C 7mmHx5mmDx2mmP C4 47n X7R 16V SMD 0805 C5 47n X7R 16V SMD 0805 C6 330pF COG / NPO 16V SMD 0805 C7 22 F 16V Elect. 20% TH 105C 7mmHx5mmDx2mmP C8 6n8 X7R 16V SMD 0805 C9 6n8 X7R 16V SMD 0805 C10 22 F 16V Elect. 20% TH 105C 7mmHx5mmDx2mmP C11 100n X7R 25V SMD 0805 C12 100n X7R 25V SMD 0805 C13 100n X7R 25V SMD 0805 C14 22 F 16V Elect. 20% TH 105C 7mmHx5mmDx2mmP C15 22 F 16V Elect. 20% TH 105C 7mmHx5mmDx2mmP C16 100 F 16V Elect 20% TH 105C 11mmHx6.3mmDx2.5mmP C17 1 F 63V 5mm pitch C18 1 F 63V 5mm pitch Multicomp MCMHR series Multicomp MCMHR series Multicomp MCMHR series Multicomp MCMHR series Multicomp MCMHR series Multicomp MCMHR series Rubycon YXF series Low imp Polyester Polyester ISSUE 2 - JULY 2002 5 ZXCD100MOEVAL PCB ID Value Case Notes Capacitors cont. :C19 C20 C21 C22 C23 C24 C25 C26 C27 C28 C29 C30 C31 C32 C33 C34 C35 C36 C37 1 F 63V 1 F 63V 100nF X7R 25V 22 F 16V Elect. 20% 1 F 63V 1 F 63V 100n 50V X7R 220 F 25V Elect 20% 470n 50V X7R 470n 50V X7R 2200 F 50V Elect. 20% 220n 50V X7R 100n 50V X7R 100 F 50V Elect 20% 100n 50V X7R 22 F 16V Elect. 20% 1nF 16V X7R 100n 16V X7R 5mm pitch 5mm pitch SMD 0805 TH 105C 7mmHx5mmDx2mmP 5mm pitch 5mm pitch SMD 0805 3.5mmP SMD 1812 SMD 1812 TH 105C 35.5mmHx18mmDx7.5mmP SMD 0805 SMD 0805 TH 105C 11.5mmHx8mmDx3.5mmP SMD 0805 3.5mmP SMD 0805 SMD 0805 Polyester Polyester Multicomp MCMHR series Polyester Polyester Panasonic FC series Low imp. Rubycon ZL series Low imp. Not Used Integrated Circuits :U1 U2 Transistors :Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9 Q10 Diodes :D1 D2 D3 D4 D5 D6 ZD1 ZD2 ZD3 ZD4 ZD5 Inductors :L1 L2 PG0058 (Pulse) 555-8820-20(Cambion) PG0058 (Pulse) 555-8820-20(Cambion) 20 20 20 20 H H H H 100W inductor 100W inductor 100W inductor 100W inductor BAS16 BAS16 BAS16 BAS16 BAV70 BAS16 BZX84C10 BZX84C10 BZX84C10 BZX84C10 BZX84C13 SMD SOT23 SMD SOT23 SMD SOT23 SMD SOT23 SMD SOT23 SMD SOT23 SMD SOT23 SMD SOT23 SMD SOT23 SMD SOT23 SMD SOT23 ZXM64N035L3 ZXM64P035L3 ZXM64P035L3 ZXM64N035L3 TIP120 FMMT591A ZVN3306 FMMT591A FMMT591A ZXM64P035G TO220 TO220 TO220 TO220 TO220 SMD SOT23 SMD SOT23 SMD SOT23 SMD SOT23 TO220 ZXCD1000 NE5532 QSOP16 (Exposed Pad) SMD SO8 Double Diode 10V Zener diode 10V Zener diode 10V Zener diode 10V Zener diode 13V Zener diode ISSUE 2 - JULY 2002 6 ZXCD100MOEVAL ISSUE 2 - JULY 2002 7 Fg 4. 100W into 4 circuit diagram ZXCD100MOEVAL 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 2 - JULY 2002 8 |
Price & Availability of ZXCD100MOEVAL
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