semelab plc. reserve the right to change the products shown on this datasheet in the interest of improved specification. no responsibility is assumed for the use of information contained herein, nor for any infringement of patent or rights of others that may result from such use. no license is granted by implication or otherwise under any patent or patent right of semelab plc. SDV1005-600: 600w rms, class d, audio amplifer master module features ? high power: 600w rms 1 ? high efficiency ~90% ? low distortion: <0.3% thd open loop ? simple power supply requirement 2 ? thermally efficient package: -integral heatsink -no cooling fans required ? low noise: noise floor typ. 70db down 3 ? emc screen integral to package ? over temperature protection option 4 ? over current protection option 4 -pulse by pulse ? low quiescent current - mute facility ? drives a 16 ? ? ? ? ,8 ? ? ? ? and 4 ? ? ? ? speaker 5 ? slave modules can be linked to boost drive capability (with master option) ? other power options available 1 ? low cost ? lightweight ? custom amplifier designs available notes 1) other power options include 2000w, 1000w, 300w, 150w and 50w. alternately, custom power levels can be produced. 2) companion psu unit will be available early 2000 3) assumes minimisation of external noise coupling i.e. the noise measured is internally induced only. 4) contact magnatec ltd. for more details of these options 5) 2 ? ? ? ? speaker variant available applications ? professional audio power amplifier ? active speaker systems ? active sonar systems ? noise cancellation systems ? motor drive modules ? power conversion ? ups - sine wave inverter description the SDV1005-600 is a complete professional audio power amplifier module. the module contains power transistor drive electronics, control and protection circuitry. only a power supply, decoupling capacitors and output filter (optional) must be added to produce a stand alone professional audio amplifier. the module is optimised to drivea4 ? load (16 ? ,8 ? and 2 ? optimised versions are available). modules can be ganged together to produce a stereo amplifier. for higher power applications the sdv1006 slave module can be linked to the power amplifier to increase the drive capability. please contact magnatec ltd. for a confidential discussion of your requirements and further application information. class d audio amplifer module preliminary information subject to change for product being developed. full product release expected early 2000
semelab plc. reserve the right to change the products shown on this datasheet in the interest of improved specification. no responsibility is assumed for the use of information contained herein, nor for any infringement of patent or rights of others that may result from such use. no license is granted by implication or otherwise under any patent or patent right of semelab plc. rail voltage, v rs ??????????????????????????..?.... 100 v control voltages v l ???????????????????????????? 18 v total current into v l ..??????????????????????????. 150 ma operating free air temperature, t a ?...????????????????? -10 cto40 c storage temperature range, t stg ????????????????????.. -40 cto70 c pcb solder pad temperature for 60 secs ??..?????????????????.. 260 c stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. these are stress ratings only and functional op eration of the device at these or any other conditions beyond those indicated ?recommended operating conditions? is not implied. recommended operating conditions min typ max unit rail voltage, v rs 06580v power supply voltages, v l 91012v audio input, s 2 0 1 1.09 vp-p modulation factor 0 0.9 0.98 operating free air temperature, t a 10 40 c electrical characteristics at a free air temperature of 25 c value param eter notes/test conditions v rs = 65 v unit min typ max s 3 enable input (other input options available) leave unconnected or connect to 0v to enable 4.75 5 5.25 vp-p r en enable input impedance 5 k ? r in audio input impedance (other input options available) 7.3 k ? i l power supply current r l =4 ? 40 50 ma i rs power rail current r l =4 ? 16 a p rr allowable power rail ripple separate power supply module available 1% r o output resistance r l =4 ? 100 m ? snr signal to noise ratio r l =4 ? -70 db f sw switching frequency (provisional) 245 khz t pd propagation delay (power output stage) r l =4 ? 150 ns specifications absolute maximum ratings
semelab plc. reserve the right to change the products shown on this datasheet in the interest of improved specification. no responsibility is assumed for the use of information contained herein, nor for any infringement of patent or rights of others that may result from such use. no license is granted by implication or otherwise under any patent or patent right of semelab plc. the total coupled power from the input of the amplifier to the load is determined by three parameters. these are: 1. the input signal level with respect to the maximum input level ( modulation factor ) 2. the inherent efficiency of the amplifier module. 3. the attenuation of the audio signal by the output filter ( filter attenuation ). modulation factor the maximum input audio signal level for the amplifier is normally 1v peak to peak. for signal levels greater than this range the amplifier will 'clip' which will produce a distorted signal (see trace opposite). driving the amplifier into clip will not damage the module but will severely degrade the replication of the audio signal and can in some cases damage the loudspeakers. at 1v peak to peak the modulation factor is 0.9 i.e. the input signal is at 90% of the full input range. if the input signal magnitude is well controlled, higher modulation factors can be used. in practice 0.98 modulation factor (1.09v peak to peak) should be considered the absolute maximum and 0.95 (1.05v peak to peak) should be adopted in applications where maximum power coupled to the loudspeaker load is desirable. inherent efficiency the amplifier modules are tested for the inherent efficiency by measuring the power coupled into the defined load (non-inductive dummy load). to calculate the inherent efficiency, the differential voltage across the load is measured for the defined rail voltage. the control of the power output from the amplifier module is achieved by varying the rail voltage. at a given rail voltage the maximum theoretical output power is given by the chart opposite. for example, if the rail voltage is 20v and the differential voltage across the load is measured at 38v, the power into a 4 ? load would be: output power and efficiency total coupled power output of amplifier due to overmodulation of input -1.5 -1 -0.5 0 0.5 1 1.5 0 0.001 0.002 0.003 0.004 0.005 0.006 0.007 0.008 0.009 0.01 time (secs) input voltage (volts) rail voltage versus maximum power into apure4ohmpureresistiveload 0 10 20 30 40 50 60 70 0 100 200 300 400 500 600 power (w) rail voltage (v)
semelab plc. reserve the right to change the products shown on this datasheet in the interest of improved specification. no responsibility is assumed for the use of information contained herein, nor for any infringement of patent or rights of others that may result from such use. no license is granted by implication or otherwise under any patent or patent right of semelab plc. maximum theoretical output power at 20v = 70wrms. then, the inherent efficiency of the amplifier module is 90%. in practice, the quality of the amplifier terminations can affect the inherent efficiency, for maximum efficiency the power connections (rail voltage, output terminals and the power ground) should be made with soldered connections. if losses in the wiring to the load are minimised inherent efficiencies of 95% are achievable. filter attenuation the direct output from the amplifier module is a pulse width modulated signal. the underlying audio signal has been mixed inside the amplifier with a switching frequency at 245khz. it is possible to connect the amplifier output directly to a loudspeaker and produce acceptable performance. however, if the speaker is remote from the amplifier or sensitive high frequency tweeters are being used it is advisable to filter out the switching frequency. design of a high efficiency, flat passband filter with maximum attenuation of the switching frequency is not trivial. hence, the audio amplifier output filter requirements are minimum attenuation and distortion in the passband from 20hz to 20khz. thereafter maximum attenuation at the switching frequency. the load for the filter is a 4 ? loudspeaker which could vary dynamically from 1 ? to 8 ? . if a simple lc lowpass filter is used to minimise the attenuation in the audio band of frequencies, the attenuation of the modulation fundamental frequency will be typically 25db. in addition, any gain peaking introduced by the simple filter will distort the upper frequency ranges of the audio band and introduce instabilities. in some applications this simple filter could be acceptable, however, for more demanding applications semelab plc have developed and patented a filter for use with the amplifier that provides greater than 40db attenuation of the switching frequency, whilst providing a flat audio passband with less than 0.5db attenuation. for more details of alternative filter combinations contact semelab plc. measured power = (38/2) 2 /(4 * 2) or 64wrms from the chart above: simple lc filter with gain peak -60.00 -50.00 -40.00 -30.00 -20.00 -10.00 0.00 10.00 20.00 30.00 1,000 10,000 100,000 1,000,000 frequency (hz) transmission (db) l c l c SDV1005-600 power amplifier module out1 out2
semelab plc. reserve the right to change the products shown on this datasheet in the interest of improved specification. no responsibility is assumed for the use of information contained herein, nor for any infringement of patent or rights of others that may result from such use. no license is granted by implication or otherwise under any patent or patent right of semelab plc. when calculating the total coupled power the combined effects of the above parameters must be considered. one final parameter that will affect the total coupled power that is within the control of the user is the wiring resistance. it is important to minimise the resistance of the cableforms from the amplifier to the filter (if used) and from the filter to the loudspeaker. for example, 0.1 ? of cable resistance will form a potential divider with the speaker load. for a 4 ? load the power loss due to this wiring resistance is 0.4db. if the total coupled power into the load is expressed in decibels of loss (excluding wiring resistance) then: total coupled power = theoretic output power + modulation factor + inherent efficiency + filter attenuation using our patented filter design, and maximum modulation factor, it is possible to achieve total coupled power figures of 85% or -1.4db attenuation in the audio pass band. to minimise quiescent power dissipation the output power stage of the module can be disabled using the enable (s3) input. distortion and noise the noise characteristics of the SDV1005-600 amplifier module are different from a linear amplifier in that the dominant source of 'noise' is the amplifier switching frequency. this frequency at 245khz is present even when no audio signal is input to the amplifier. the switching signal is a square wave and will have harmonics of the fundamental frequency e.g. 490khz, 735khz, 1.225mhz etc. the output filter if used, must attenuate this signal and let the audio signal through without attenuation or distortion. semelab plc. have applied for a patent on a new filter configuration that is able to effectively attenuate the switching signal and leave the audio signal unaffected. the frequency spectrum of one of our filters is shown opposite (full bandwidth, no audio input). the spectral response shows the filter fundamental is attenuated by more then 50db. the third harmonic is attenuated by 60db and the fifth harmonic is attenuated by nearly 60db. this filter produces a flat audio passband irrespective of variations in the loudspeaker load, with 5% power loss in the audio passband. greater attenuation of the switching frequency can be achieved if more attenuation in the audio band is permitted. magnatec is able to supply filters designed to a custom requirement. to minimise external interference signals the audio connection to the amplifier should be via a low noise screened cable. the amplifier module should not be positioned directly adjacent to mains or similar high level voltages. the power supply used to supply the rail voltage should be regulated with a minimum ripple level of 1% or less. spectrum response of SDV1005-600 and output filter -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 0 250000 500000 750000 1000000 1250000 1500000 frequency (hz) attenuation (db)
semelab plc. reserve the right to change the products shown on this datasheet in the interest of improved specification. no responsibility is assumed for the use of information contained herein, nor for any infringement of patent or rights of others that may result from such use. no license is granted by implication or otherwise under any patent or patent right of semelab plc. thermal efficiency the SDV1005-600 amplifier module comes housed in an aluminium package. internal to the package, the power components are thermally bonded to the housing. the housing is also electrically bonded to the supply ground. the thermal resistance of the amplifier package in free air is 3 c/w ( a ). the contact thermal resistance of the amplifier can be assumed to be 0.5 c/w ( c ). to decide whether additional heatsinking is required the power level and duty cycle of the music must be estimated. the power level should be determined from the maximum power the unit is asked to produce and is determined by the rail voltage (see above chart of rail voltage versus power into a 4 ? load). assuming an inherent efficiency of 95% means that 5% of the rated power will be dissipated inside the amplifier module. for example, a maximum theoretical output power of 600w, 30w will be dissipated inside the amplifier unit. this assumes a continuous sine wave input at full modulation factor , somewhat unrealistic for audio signals with their associated latency . the actual power levels with audio signals would typically be 25% of the calculated value. if this figure is used then the power dissipation inside the module would be 7.5w. once the typical power dissipated inside the module is known the temperature rise using the module at this power can be calculated. the temperature rise is given by: temperature rise = a * power dissipation ( c) with the example above, the temperature rise would be 22.5 c above ambient temperature. the operational temperature of the module should not exceed 70 c. if the calculated temperature rise and the maximum ambient temperature for operation will exceed this figure, then additional heatsinking will be required. if heatsinking is required then the module can be mounted onto an additional heatsink. when mounting to a heatsink, it is recommended that a high thermal conductivity electrical insulating mat is used. if the thermal resistance of the new heatsink is h , then: temperaturerise=( c + h ) * power dissipation ( c) if a heatsink with a thermal resistance of 1.5 c/w is selected, then in the above example the temperature rise above ambient would be 15 c. input characteristics the input impedance of the standard amplifier module is 7.3k ? . this value was chosen to provide the best balance between ensuring sufficient impedance to the audio source and minimising the affects of external interference. the amplifier input is differential to ensure common mode noise rejection. the bandwidth of the input amplifier is 100khz (3db). this wide bandwidth is designed to afford maximum flexibility to the user. for purely audio applications, an input filter can be incorporated prior to the amplifier module. this additional circuitry can be incorporated as an option inside the amplifier package or alternatively can be configured external to the amplifier. for further discussions of these options, please contact magnatec.
semelab plc. reserve the right to change the products shown on this datasheet in the interest of improved specification. no responsibility is assumed for the use of information contained herein, nor for any infringement of patent or rights of others that may result from such use. no license is granted by implication or otherwise under any patent or patent right of semelab plc. mechanical details connections the amplifier module has been designed such that connections can be made with an edge connector. the edge connector should have the following specification: number of ways 3 2 pitch 2.54mm (0.1") card aperture 82.1m m card insertion depth (max) 8.5m m working voltage 500vd c current per contact 5 a contact resistance 10m ? ? min. temperature range -40 c to +100 c insertion / extraction force 150g max. the connector connections are (from left to right with connections uppermost) : way identifier function remarks 1-2 no connection leave free 3 s2 signal ground connect to input cableform screen 4 no connection leave free 5 s1 audio signal 1vp-p @ 90% modulation factor (this is a differential input) 6 no connection leave free 7 s2 signal ground connect to input cableform screen 8-9 no connection leave free 10 s3 enable leave unconnected to enable, connect to +5vdc to disable 11 no connection leave free 12 v l + positive supply +10.0 +0.2/-0.1vdc @ 100ma 13 no connection leave free 14 v l - negative supply -10.0 +0.1/-0.2vdc @50ma 15 no connection leave free 16-18 gnd power ground connect across all three contacts 19 no connection leave free 20-22 out1 power output to filter or loudspeaker 23 no connection leave free 24-26 out2 power output to filter or loudspeaker 27 no connection leave free 28-30 v rs rail voltage +10v to 80vdc, connect across all three contacts 31-32 no connection leave free in addition to the above, it is recommended that a 100 f, 100vdc electrolytic and a low esr 0.22 f capacitor are connected across the ground and rail voltage terminations as close as possible to the connector.
semelab plc. reserve the right to change the products shown on this datasheet in the interest of improved specification. no responsibility is assumed for the use of information contained herein, nor for any infringement of patent or rights of others that may result from such use. no license is granted by implication or otherwise under any patent or patent right of semelab plc. rail voltage versus maximum theoretical power into load 0 10 20 30 40 50 60 70 80 0 100 200 300 400 500 600 power (w) rail voltage (v) 2 ? ? 4 ? 16 ? package dimensions (all dimensions in mm) options various options to the basic amplifier module are available. these options are described below. if a required option is not found please contact magnatec. custom requirements are subject to a minimum order quantity. alternative load configurations the SDV1005-600 module is designed to drive into a 4 ? load. higher value loads can be used with the amplifier, but with proportionally less power at the same rail voltages. to increase the power coupled to the load, the rail voltages will have to be increased. if higher power levels than those shown on the graph below are required then semelab can produce a specific variant to drive the alternative load. contact magnatec for further details.
semelab plc. reserve the right to change the products shown on this datasheet in the interest of improved specification. no responsibility is assumed for the use of information contained herein, nor for any infringement of patent or rights of others that may result from such use. no license is granted by implication or otherwise under any patent or patent right of semelab plc. current monitor the standard amplifier module does not include short circuit protection. semelab has patented a current monitor that enables precise measurement of the amplifier output current and responds within 4 s to a short circuit condition. the current monitor is a coarse measure due to the nature of loudspeaker loads. the load will fluctuate due to its reactive nature and any current monitor has to allow peak current five times greater than the rms currents. however, if the amplifier module is to be used in situations where the output could be shorted (i.e. during assembly of sound systems), then this option should be considered. the current monitor circuitry can be mounted inside an enlarged module package. input characteristics the input characteristics of the standard module can be tuned to the requirements of different applications. input parameters that can be readily reconfigured include: gain: currently configured for input voltage levels up to 1vp-p. other options include 0.5vrms, 1vrms, 2vrms, 0.5vp-p, 2vp-p, 3vp-p. input impedance: currently set at 7.3k ? , consult magnatec for options suitable to the application. filter on input: currently set at 100khz (-3db point). other options include multiple pole lowpass filters with roll-offs up to 100khz. anti-clip on input: for applications where the audio source is not well defined or controlled, the anti-clip circuitry can either disable the amplifier when the signal level reaches a pre-determined threshold or dynamically reduce the input gain when the signal approaches clip. the additional circuitry is housed in an enlarged package. output filter the characteristics of the output filter can be adjusted for a particular application. parameters that can be varied include passband attenuation, stopband attenuation, passband ripple, and switching frequency attenuation. some of the aforementioned parameters are coupled and cannot be considered independently. for applications where a filter is required please discuss the requirements with magnatec. switch-mode, universal input, pfc, psu module this product is still under development, release is expected in the coming months. the power supply will be universal input 90 to 264vac, 50/60hz, power factor corrected pre-regulator, providing both rail and control voltages for the amplifier modules. multiple modules in one package the design of the packaging used for the amplifier module can be changed to include multiple amplifiers in one package. the amplifier modules could be the same or different power levels e.g. three amplifier modules at different power levels for active speaker cabinets, or two amplifiers module in one package at the same power levels for stereo amplifiers.
semelab plc. reserve the right to change the products shown on this datasheet in the interest of improved specification. no responsibility is assumed for the use of information contained herein, nor for any infringement of patent or rights of others that may result from such use. no license is granted by implication or otherwise under any patent or patent right of semelab plc. glossary active speaker integrated loudspeaker and amplifier. audio passband audio spectrum from 20hz to 20khz. anti-clip circuit to correct for excessive input signals. class d amplifier using pulse width modulated output stage. decibel measure of relative power db = 10logp1/p2 emc electro magnetic compatibility esr equivalent series resistance filter attenuation performance of a filter at a specific frequency or band of frequencies. harmonic higher multiple of a frequency (k)hz (kilo) hertz, frequency measure inherent efficiency measure of the efficiency of the amplifier module alone. input impedance impedance looking into the amplifier. latency description of the dynamic range of music modulation factor ratio of input signal amplitude to maximum permissible signal amplitude. noise floor residual noise level of the amplifier expressed in db. output impedance source impedance seen looking into the amplifier output. pcb printed circuit board pfc power factor corrected p-p peak to peak measurement psu power supply unit pwm pulse width modulation quiescent current current consumed by amplifier with no audio signal input. rms root mean square = vp-p/(2 2) slave module additional power output stage driven from an optional master unit. snr signal to noise ratio switching frequency sample frequency of pwm. thd total harmonic distortion - measure of the accuracy with which an amplifier replicates an input sine wave. theoretical output power maximum output power of amplifier module, alone assuming 100% efficiency. thermal resistance measure of heatsink efficiency total coupled power actual power coupled from amplifier to load (loudspeaker) ups uninterruptable power supply
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