quickpack ? QPA3202 piezo power amplifier mid technology corporation. www.mide.com ph +1 781 306 0609 1 quickpack ? QPA3202 piezo power amplifier
quickpack ? QPA3202 piezo power amplifier mid technology corporation. www.mide.com ph +1 781 306 0609 2 table of contents ? description .............................................................. 3 ? QPA3202 specific ations ...................................................... 4 ? applications information ........................................ 5 ? warning! to reduce the risk of injury: ................................. 5 ? user inte rface ...................................................................... 6 ? gain adju st .......................................................................... 6 ? voltage moni tor .................................................................... 7 ? output current limit ............................................................. 7 ? thermal overload protection ............................................... 7 ?
quickpack ? QPA3202 piezo power amplifier mid technology corporation. www.mide.com ph +1 781 306 0609 3 description the ? QPA3202 ? is ? a ? single \ channel, ? linear ? power ? amplifier ? specifically ? designed ? for ? driving ? mid?s ? line ? of ? quickpack/poweract ? transducers ? and ? other ? piezoelectric ? capacitive ? transducers. ?? it ? offers ? a ? fixed ? or ? adjustable ? dc ? gain ? up ? to ? 50 ? v/v ? with ? a ? bipolar ? output ? range ? from ? +200v ? to ? ?200v. ?? the ? QPA3202 ? has ? a ? bandwidth ? of ? 8 ? khz ? and ? a ? minimum ? current ? limit ? of ? 0.2 ? amperes. ??? an ? analog ? output ? jack ? is ? provided ? on ? the ? face ? of ? the ? amplifier ? for ? precisely ? monitoring ? scaled ? (1/50) ? output ? voltage. ??? ? the ? QPA3202 ? is ? equipped ? with ? thermal ? overload ? protection ? and ? output ? short \ circuit ? protection. ?? in ? the ? event ? of ? a ? fault, ? the ? device ? enters ? a ? shutdown ? mode ? during ? which ? time ? the ? output ? is ? disabled ? until ? power ? is ? recycled ? and ? the ? fault ? is ? cleared. ?? led ? indicators ? alert ? the ? user ? when ? a ? fault ? condition ? has ? occurred. ? ? the ? amplifier ? is ? packaged ? in ? a ? compact ? aluminum ? enclosure ? measuring ? 12 ? x ? 9 ? x ? 4 ? inches ? with ? a ? total ? weight ? of ? 5.5 ? kg ? (12.1 ? lbs). ?? it ? is ? designed ? for ? benchtop ? or ? rack \ mount ? operation. ?? its ? low \ cost, ? simple ? functions ? and ? high ? performance ? make ? the ? QPA3202 ? a ? suitable ? choice ? for ? a ? wide ? range ? of ? piezoelectric ? transducer ? applications. ? ? ? features: ? ? differential ? output ? range ? from ? +200v ? to ? ?200v ? ? peak ? output ? current ? > ? 2a ? ? fixed ? and ? adjustable ? dc ? gain ? up ? to ? 50v/v ?? ? precision ? output ? voltage ? monitor ? (1/50 ? scale) ? ? short \ circuit ? and ? thermal ? overload ? protection ? ? simple ? interface ? and ? small ? form ? factor ? ? ordering ? information: ? ? QPA3202: ?? user ? selectable ? 110v ? @ ? 60hz ? or ? 220v ? @ ? 50hz ? ac ? input ? ? contact ? mid ? for ? custom ? designs ?? ? accessories: ? ? ac ? power ? cable ? (included) ? ? output ? cables ? and ? transducers ? sold ? separately ? ?
quickpack ? QPA3202 piezo power amplifier mid technology corporation. www.mide.com ph +1 781 306 0609 4 QPA3202 specifications maximum ratings: analog input voltage v in +/-10 v operating temperature t a 40 c storage temperature t s 85 c ? table 1: electrical characteristics ambient temperature 25c unless otherwise stated. load capacitance 1uf or less parameter symbol conditions/notes min typ max units power characteristics power dissipation p dis no load, v out = 0 v 15 w w input characteristics input voltage range v in +/-5 v v input impedance z in 1000 ohms output characteristics positive output voltage limit +v lim dc input signal 210 v negative output voltage limit -v lim dc input signal -210 v maximum positive peak current +i lim 2 a maximum negative peak current -i lim -2 a output offset voltage v os vin = 0, av = 50 +/-500 mv fixed dc gain a v 49.0 50 51.0 v/v max adjustable gain a vmax 50 v/v min adjustable gain a vmin 15 v/v voltage monitor scale 1% accuracy 0.02 v/v voltage monitor output impedance 1000 ohms dynamic performance -3db bandwidth bw small signal input, no load 8 khz noise rms amplitude < 20 mhz 20 mv rms physical length l 23 cm width w 30.5 cm height h 9.5 cm weight m 5.5 kg notes: fused on rear panel: 1.25a, 250v 5x20mm time-lag fuse | output connector plug: conxall 6282-2pg-3dc ?
quickpack ? QPA3202 piezo power amplifier mid technology corporation. www.mide.com ph +1 781 306 0609 5 applications information ? warning! to reduce the risk of injury: ? read ? all ? instructions ? and ? warnings ? before ? using ? this ? product. ? ? this ? product ? creates ? a ? hazardous ? voltage ? at ? its ? terminals . ?? do ? not ? connect ? loads ? or ? touch ? the ? output ? terminal ? while ? power ? is ? on. ?? do ? not ? touch ? the ? piezoelectric ? actuator ? during ? operation. ? ? provide ? adequate ? space ? for ? ventilation ? to ? avoid ? excessive ? internal ? heating. ?? do ? not ? block ? rear ? or ? side ? vents. ?? do ? not ? install ? this ? product ? in ? a ? closed ? cabinet. ? ? this ? product ? must ? be ? grounded. ? use ? only ? with ? a ? three \ pronged ? ac ? power ? cord ? having ? an ? equipment \ grounding ? conductor ? and ? grounding ? plug. ?? ? this ? product ? should ? not ? be ? use ? in ? warm ? environments ? or ? near ? products ? that ? emit ? heat. ? ? do ? not ? use ? if ? this ? product ? exhibits ? a ? marked ? change ? in ? performance ? or ? appears ? to ? function ? abnormally. ?
quickpack ? QPA3202 piezo power amplifier mid technology corporation. www.mide.com ph +1 781 306 0609 6 user interface figure 1: user interface of the QPA3202 all ? controls ? and ? signal ? terminations ? of ? the ? QPA3202 ? are ? on ? the ? face ? of ? the ? instrument ? as ? illustrated ? in ? figure ? 1. ?? the ? ac ? power ? cord ? receptacle ? and ? fuse ? are ? on ? the ? rear ? panel ? figure ? 2. ?? at ? the ? left ? are ? three ? multi \ colored ? led ? indicators ? that ? alert ? the ? user ? to ? the ? instrument ? status. ?? when ? the ? power ? switch ? is ? closed ? and ? the ? amplifier ? is ? on, ? the ? green ? led ? marked ? pwr ? will ? be ? illuminated. ?? the ? output ? of ? the ? amplifier ? requires ? a ? conxall ? connector, ? however ? the ? input ? and ? monitor ? connections ? are ? made ? using ? a ? bnc ? connector. ? ? ? figure ? 2: ?? user ? interface ? of ? the ? QPA3202 ? the ? QPA3202 ? offers ? protection ? features ? that ? prevent ? damage ? to ? the ? amplifier ? in ? the ? event ? of ? a ? fault. ?? if ? the ? output ? is ? short \ circuited, ? or ? if ? the ? internal ? temperature ? of ? the ? amplifier ? exceeds ? its ? threshold, ? the ? amplifier ? goes ? into ? shutdown ? mode. ?? in ? this ? mode, ? the ? output ? is ? disabled ? until ? the ? user ? clears ? the ? fault ? and ? recycles ? the ? power. ?? shutdown ? mode ? is ? signified ? by ? the ? illumination ? of ? red ? leds ? on ? the ? face ? of ? the ? amplifier. ?? the ? led ? marked ? oc ? is ? illuminated ? after ? an ? over \ current ? (short \ circuit) ? fault ? while ? the ? led ? marked ? ot ? is ? illuminated ? during ? an ? over \ temperature ? fault. ??? ? the ? input ? voltage ? signal ? should ? be ? connected ? to ? the ? input ? bnc ? terminal ? on ? the ? amplifier ? front ? panel. ?? a ? second ? bnc ? terminal ? marked ? monitor ? offers ? the ? user ? an ? analog ? output ? signal ? that ? is ? a ? scaled ? replica ? (1/50) ? of ? the ? output ? voltage ? for ? monitoring ? purposes. ?? the ? cable ? leading ? to ? the ? piezoelectric ? actuator ? should ? be ? connected ? to ? the ? black ? circular ? jack ? marked ? output . ?? note ? that ? this ? output ? is ? a ? differential ? output ? and ? both ? pins ? on ? this ? terminal ? contain ? hazardous ? voltage ? levels ? that ? can ? damage ? equipment ? or ? cause ? injury. ?? extreme ? caution ? should ? be ? exercised ? when ? operating ? the ? QPA3202. ?? loads ? should ? be ? connected ? and ? disconnected ? to ? the ? output ? terminal ? only ? when ? power ? is ? off. ?? do ? not ? directly ? touch ? the ? output ? terminal ? pins ? or ? the ? piezoelectric ? actuator ? at ? any ? time ? while ? the ? power ? is ? on. ? gain adjust the ? QPA3202 ? offers ? the ? user ? a ? selection ? of ? either ? fixed ? or ? adjustable ? gain. ? gain ? control ? is ? implemented ? by ? the ? switch ? and ? knob ? controls ? at ? the ? center ? of ? the ? instrument. ?? the ? gain ? switch ? can ? be ? placed ? in ? one ? of ? two ? positions. ?? when ? the ? switch ? is ? raised ? high ? in ? the ? fix ? position, ? the ? gain ? of ? the ? QPA3202 ? is ? fixed ? at ? 50v/v. ?? when ? the ? switch ? is ? lowered ? to ? the ? adj ? position, ? the ? gain ? of ? the ? QPA3202 ? is ? variable ? in ? the ? range ? of ? 15 ? to ? 50v/v ? and ? is ? controlled ? by ? the ? knob ? marked ? gain ? adj. ?
quickpack ? QPA3202 piezo power amplifier mid technology corporation. www.mide.com ph +1 781 306 0609 7 voltage monitor the ? QPA3202 ? offers ? an ? auxiliary ? analog ? output ? for ? feedback ? control ? or ? monitoring ? the ? differential ? output ? voltage. ?? the ? monitor ? output ? is ? a ? replica ? of ? the ? load ? voltage ? scaled ? by ? a ? factor ? of ? 1/50 ? (0.02 ? v/v). ?? this ? output ? should ? be ? connected ? only ? to ? an ? oscilloscope ? or ? other ? high \ impedance ? monitoring ? device. ? output current limit piezoelectric ? actuators ? can ? be ? effectively ? modeled ? by ? a ? simple ? capacitor. ?? there ? is ? significant ? resistance ? in ? series ? with ? the ? capacitor, ? but ? this ? is ? neglected ? here. ?? like ? any ? other ? amplifier, ? the ? drive ? frequency ? limitation ? of ? the ? QPA3202 ? is ? a ? function ? of ? its ? peak ? current ? capability, ? according ? to ? the ? familiar ? equation: ? dt t dv c t i ) ( ) ( ? ? since ? the ? current ? limit ? of ? the ? QPA3202 ? is ? 2 ? amperes ? (2a), ? the ? maximum ? output ? voltage ? slew ? rate ? is ? 2/c ? where ? c ? is ? the ? piezo ? capacitance. ?? for ? a ? pure ? sinusoid ? with ? frequency ? f ? (in ? hz) ? and ? amplitude ? v o ? (zero ? to ? peak), ? the ? maximum ? rate ? or ? derivative ? is ? o v f ? ? ? 2 . ?? therefore, ? the ? maximum ? drive ? frequency ? as ? a ? function ? of ? output ? amplitude ? v o ? and ? load ? capacitance ? c ? can ? be ? expressed ? by: ? c v f o ? ? ? ? 1 max ?? the ? maximum ? frequency ? f max ? is ? the ? frequency ? at ? which ? the ? output ? waveform ? becomes ? distorted ? by ? current \ limiting. ?? sinusoids, ? for ? example, ? will ? become ? linear ? at ? zero ? crossings. ??? operation ? is ? permitted ? beyond ? this ? frequency ? provided ? that ? internal ? temperature ? limitations ? are ? not ? exceeded ? (see ? following ? sections). ?? large ? capacitive ? loads ? may ? also ? de \ stabilize ? the ? amplifier. ?? note ? that ? this ? constraint ? is ? in ? addition ? to ? the ? amplifier ? bandwidth, ? which ? is ? limited ? to ? 8khz. ? thermal overload protection high ? internal ? power ? dissipation ? is ? common ? to ? all ? linear ? amplifiers ? that ? are ? designed ? to ? drive ? capacitive ? loads. ?? this ? dissipation ? is ? a ? function ? of ? load ? capacitance, ? output ? voltage ? amplitude, ? and ? drive ? frequency. ?? in ? general, ? increasing ? any ? of ? these ? variables ? increases ? power ? dissipation. ?? if ? there ? are ? no ? means ? to ? limit ? this ? effect, ? heavy ? loads ? will ? cause ? excessive ? temperatures ? that ? can ? overheat ? and ? damage ? the ? amplifier. ?? for ? this ? reason ? the ? QPA3202 ? is ? equipped ? with ? internal ? temperature ? monitoring ? circuitry. ?? when ? the ? internal ? temperature ? exceeds ? a ? predefined ? threshold, ? the ? QPA3202 ? will ? enter ? thermal ? shutdown ? mode . ?? in ? this ? mode ? the ? amplifier ? is ? automatically ? switched ? off ? and ? the ? ot ? led ? indicator ? is ? illuminated. ?? the ? instrument ? will ? remain ? in ? this ? condition ? until ? the ? user ? recycles ? the ? power ? supply ? and ? the ? temperature ? has ? decreased ? to ? a ? safe ? level. ??? ? figure ? 3 ? indicates ? the ? thermal ? shutdown ? boundary ? as ? a ? function ? of ? frequency ? and ? load ? capacitance ? for ? full \ scale ? output ? (200v ? sinusoid). ?? this ? curve ? applies ? to ? steady \ state ? operation ? only. ?? the ? QPA3202 ? is ? capable ? of ? operating ? beyond ? this ? curve ? provided ? that ? the ? duration ? of ? operation ? (or ? duty \ cycle) ? is ? low ? enough ? to ? prevent ? over \ heating. ? ? ? ?
quickpack ? QPA3202 piezo power amplifier mid technology corporation. www.mide.com ph +1 781 306 0609 8 ? figure ? 3: ?? thermal ? shutdown ? boundary ? as ? function ? of ? frequency ? and ? load ? capacitance ? for ? a ? full \ scale ? (+/ \ 200v) ? output ? signal. ?? operation ? in ? the ? shutdown ? range ? is ? permitted ? only ? for ? short ? durations. ?? ? signal ? distortion ? or ? a ? blown ? fuse ? may ? occur. ? ? ? ? ? ? ? ? ?
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