ICEpower50ASX2 Datasheet 1-1b - Qobuz
Bang & Olufsen ICEpower a/s, Gl. Lundtoftevej 1b, DK-2800 Kgs. LyngbyPhone [45] 45 20 36 00, Fax [45] 45 20 36 99, CVR-no. 25053591ICEpowerinfo@bang-olufsen.dk, power50ASX2(BTL)2x50W or 1x170W ICEpower Amplifiers withintegrated ICEpower SupplyVersion 1.1ContentsGeneral Description . 2Block Diagram . 3Connection Diagram. 3Absolute Maximum Ratings . 5Power Specifications . 6General Audio Specifications (SE-version). 6General Audio Specifications (BTL-version). 7Electrical Specifications . 7Timing Specifications . 7Disturbances on the Mains. 8Mechanical Specifications . 8Typical Performance Characteristics . 9Dissipated Power vs. Output Power . 16Loading . 17Features. 18Protection Features . 20Input/Output Interface . 21Operational Timing Diagram . 23Thermal Design. 23Physical Dimensions . 24Drill Pattern. 26Safety Standards. 27ESD Warning . 27Packaging and Storing . 27Notes. 28Page 1 of 28
ICEpower50ASX2, 2x50W or 1x170W ICEpower Amplifiers with integrated ICEpower SupplyVersion 1.1General DescriptionThe ICEpower50ASX2(SE) and ICEpower50ASX2(BTL) are two fully integrated audio power conversion solutionsdesigned particularly for highly competitive consumer and professional audio products. The modules are EMCand safety pre-approved and the “black-box” completeness allows for fast design-in and minimized time tomarket. Key benefits include: State-of-the-art, high efficiency ICEpoweramplification stage based on the patentedHCOM modulation and MECC controltechniques An ICEpower Supply with selectable mainsconverter and separate aux converter. A wide set of features for plug-and playimplementation into applications such asactive speakers and subwoofers, wirelessspeakers, multimedia audio, musicalinstrument amplifiers and distributed audio.The two output configurations mean that the modules can be used for both stereo and mono applications.Combined with the auxiliary supply for powering external circuitry and the complete elimination of heat sinksand EMI shields; the ICEpower50ASX2 is the natural choice in any audio application that requires a compact,integrated power solution.The modules are protected against short-circuit, overload and over-heating and includes on-board fuses and EMIfiltering to provide a CE and FCC pre-approved design.Key Specifications 170W @ 4Ω,1% THD N, 20Hz – 20kHz(BTL-version) 2 x 47W @ 4Ω, 1% THD N, 20Hz – 20kHz(SE-version, both channels driven) 125dBA dynamic range (BTL-version) 120dBA dynamic range (SE-version) THD N 0.003% @ 1W (8Ω,1kHz, SE) THD N 0.002% @ 1W (8Ω,1kHz, BTL) 81 % total efficiency @ 170W, 4Ω CCIF Intermodulation distortion 0.0002%,10W, 4Ω, 18.5kHz/1kHz 25V unregulated auxiliary power supply Selectable Mains 85-132VAC & 170-264VACPage 2 of 28Key Features Fully integrated audio power solution Available in two preconfigured output versions Rugged construction Thermal protection Over current protection Sound optimized soft clipping Suitable for CE approved designs EMI conforms to:EN55013EN55020EN61000-3-2EN61000-3-3FCC part 15-B Safety conforms to: IEC 60065 7th ed.UL 60065 7th ed.
ICEpower50ASX2, 2x50W or 1x170W ICEpower Amplifiers with integrated ICEpower SupplyBlock DiagramFigure 1: ICEpower50ASX2(SE, BTL) block diagramConnection DiagramFigure 2: ICEpower50ASX2 connections (SE-version shown).Note: On the BTL-version, connector P101 is not mounted and P104 is used for output.Page 3 of 28Version 1.1
ICEpower50ASX2, 2x50W or 1x170W ICEpower Amplifiers with integrated ICEpower SupplyVersion 1.1The connector interface of the ICEpower50ASX2 modules has five industry standard connectors selected forlong-term reliability.AC Header Specifications (P100)Type: JST B2P3-VHPIN Function1Live2NeutralDescriptionLive ACNeutral ACTypeInputInputTable 1: AC connector specifications.Speaker Header Specifications (P101)*Type: JST B2P-VHPINFunction1Vo 2GNDDescriptionAmplifier output channel 1GNDchannel1TypeOutputGNDTable 2: Speaker connector specifications.*P101 is not mounted on the BTL-version.Speaker Header Specifications (P104)Type: JST B2P-VHPINFunction1Vo 2GNDDescriptionAmplifier output channel 2GNDchannel2TypeOutputGNDTable 3: Speaker connector specifications.Signal Header Specifications (P102)Type: JST B7B-PH-K-SPIN Function7Vin channel 16GND5GND4Vin channel 23Thermal2OC1EnableDescriptionInput signal channel 1Ground terminal for the signal section.Ground terminal for the signal section.Input signal channel 2Thermal monitoring pinMonitor pin amplifier over currentAmplifier Table 4: Signal connector specifications.Auxiliary Supply Header Specifications (P103)Type: JST B3B-PH-K-SPIN Function1Vdaux2GND3VsauxDescriptionPositive unregulated auxiliary supply (typical 25V)Ground terminal for the auxiliary section.Negative unregulated auxiliary supply (typical -25V)Table 5: Auxiliary supply header specifications.Page 4 of 28TypeOutputGNDOutput
ICEpower50ASX2, 2x50W or 1x170W ICEpower Amplifiers with integrated ICEpower SupplyVersion 1.1Absolute Maximum RatingsAbsolute maximum ratings indicate limits beyond which damage may occur.Mains Input Section115V mains settingSymbolParameterValueUnitsACmaxACminFMaximum off-line voltageMinimum off-line voltageMains frequency range 85VAC - 132VAC132851)45 – 65VACVACHzTable 6: Absolute maximum ratings, mains input section - 115V setting.230V mains settingSymbolParameterValueUnitsACmaxACminFMaximum off-line voltageMinimum off-line voltageMains frequency range 170VAC - 264VAC2641701)45 – 65VACVACHzTable 7: Absolute maximum ratings, mains input section - 230V setting.1) The ICEpower50ASX2 will operate at lower levels but the output power will be reduced. If the off-line voltage is too low theICEpower50ASX2 switches off.Auxiliary SupplySymbolIVdIVsParameterMaximum current draw from Vd ( 25V)2)Maximum current draw from Vs (-25V)2)Value200-200UnitmAmATable 8: Absolute maximum ratings, auxiliary supply.2) If the auxillary supply on the ICEpower50ASX2 is used with a capacitive load please remember to read the section “Capacitive Loading ofthe AUX Supply” in the ICEpower50ASX2 Designer’s manual.Input SectionSymbolParameterVin channel 1 ,Vin channel 2Maximum voltage range on pinValue 3.3UnitVpTable 9: Absolute maximum ratings, input section.Output SectionSymbolParameterRloadIout3)Minimum loadMaximum current draw fromamplifier outputMaximal pure capacitive loadingCLValueUnitsΩ320A470nFTable 10: Absolute maximum ratings, output section.3) The over current protection will act to protect the amplifier. (See ”Protection features”)Thermal SectionSymbolParameterTaMax. operating ambient temperature(tropical conditions)Table 11: Absolute maximum ratings, thermal section.Page 5 of 28Value50UnitOC
ICEpower50ASX2, 2x50W or 1x170W ICEpower Amplifiers with integrated ICEpower SupplyVersion 1.1Power SpecificationsUnless otherwise specified. Ta 25 OC, f 1kHz, RL 4Ω, 230V terTime of maximum rated output powerContinuous output power4) withoutthermal shutdown. (SE, 4Ω)Both channels drivenContinuous output power4) withoutthermal shutdown. (SE, 8Ω)Both channels drivenContinuous output power4) withoutthermal shutdown. (BTL, 4Ω)Continuous output power4) withoutthermal shutdown. (BTL, 8Ω)Quiescent power consumption (–amplifier disabled)Quiescent power consumption (amplifierenabled)Total power efficiencyNominal DC voltageConditions170W out. No preheating.Thermal stab. @ Ta 25 OC.Min-Typ12043Max-UnitssWThermal stab. @ Ta 25 OC.-30-WThermal stab. @ Ta 25 OC.-50-WThermal stab. @ Ta 25 OC.-100-WEnable pin low-4-WPo 0W-7-W 31%Po 100WPo 170WAny combination of mainsvoltage and output powerwithin specified ranges. 168081 25VTable 12: Power specifications.4) The module is mounted vertically in free air.General Audio Specifications (SE-version)Unless otherwise specified, f 1kHz, PO 1W, Ta 25 OC.SymbolPOPOPOTHD NVN,OAVffuflZoZLDIMDTIMParameterOutput power @ 1%THD N20Hz f 20kHz, both channels driven.(AES17 measurement filter) 6)Output power @ 10%THD N20Hz f 20kHz, both channels driven.(AES17 measurement filter) 6)Output power @ 1%THD N20Hz f 20kHz, one channel driven.(AES17 measurement filter) 6)THD N (4Ω,AES17 measurement filter) 6)Output referenced idle noiseNominal Voltage GainFrequency responseUpper bandwidth limit (SE)(-3dB)Lower bandwidth limit (-3dB)Abs. output impedanceLoad impedance rangeDynamic rangeIntermodulation (CCIF)Transient intermodulation (DIM30)ConditionsRL 4Ω230Vac / 50Hz,115Vac / 50HzRL 4Ω230Vac / 50Hz,115Vac /50HzRL 4Ω230Vac / 50Hz,115Vac / 50Hzf 100Hz, PO 1WA-weightedf 1 kHz20Hz - 20kHz, All loadsRL 8ΩRL 4ΩRL All loadsf 1kHzMinTypUnits-4745-W-5754-W-50500.0032520.5 0.1130951.51441200.00070.00715203A-weighted (50W, 4Ω)f 18.5kHz, 1kHz, PO 10WPO 10WMax-0.017021 0.525 -W%μVdBdBkHzkHzHzmΩΩdB%%Table 13: General audio specifications.6) An Audio Precision AES17 20 kHz 7th order measurement filter is used for measurements. The frequency 6.67 kHz corresponds to theworst-case situation where both 2nd and 3rd harmonics are within the audio band.Page 6 of 28
ICEpower50ASX2, 2x50W or 1x170W ICEpower Amplifiers with integrated ICEpower SupplyVersion 1.1General Audio Specifications (BTL-version)Unless otherwise specified, f 1kHz, PO 1W, Ta 25 OC.SymbolPOPOTHD NVN,OAVffuflZoZLDIMDTIMParameterOutput power @ 1%THD N20Hz f 20kHz(AES17 measurement filter) 6)Output power @ 10%THD N20Hz f 20kHz(AES17 measurement filter) 6)THD N in 4Ω(AES17 measurement filter) 6)Output referenced idle noiseConditionsRL 4Ω230Vac / 50Hz,115Vac / 50HzRL 4Ω230Vac / 50Hz,115Vac /50Hzf 100Hz, PO 1WNominal Voltage GainFrequency responseUpper bandwidth limit (BTL)(-3dB)Lower bandwidth limit (-3dB)Abs. output impedanceLoad impedance rangeDynamic rangeIntermodulation (CCIF)Transient intermodulation (DIM30)MinA-weighted20Hz f 20kHzf 1 kHz20Hz - 20kHz, All loadsRL 8ΩRL 4ΩRL All loadsf 1kHzA-weighted at 170W@4Ωf 18.5kHz, 1kHz, PO 10WPO V263-27 0.2100751.51841250.00020.00328 0.630 -dBdBkHzkHzHzmΩΩdB%%Table 14: General audio specifications.6) An Audio Precision AES17 20 kHz 7th order measurement filter is used for measurements. The frequency 6.67 kHz corresponds to theworst-case situation where both 2nd and 3rd harmonics are within the audio band.Electrical SpecificationsUnless otherwise specified, Ta 25 OC.SymbolfofsfsmpsParameterIdle switching frequencySwitching frequency range (amplifier)Switching frequency (power supply)ConditionsIdleIdle to full scale Max1000UnitmsTable 15: Electrical specifications.Timing SpecificationsSymboltacdParameterPower supply start up delay.(nominal mains)Table 16: Timing specifications.Page 7 of 28ConditionsTime from reaching ACmin to all power suppliesare good and amplifier is active.Min-Typ700
ICEpower50ASX2, 2x50W or 1x170W ICEpower Amplifiers with integrated ICEpower SupplyVersion 1.1Disturbances on the MainsThe signal on the mains connection is often very noisy and large surge voltages are present. TheICEpower50ASX2 is equipped with mains filtering to suppress surges and noise.LightningTo avoid damage of the ICEpower50ASX2 in case of surges caused by lightning, special care and componentselection have resulted in capability of withstanding surges up to 5.5kV.Mechanical SpecificationsDuring development the ICEpower50ASX2 has passed tough mechanical tests to ensure high reliability.TestAccelerationAmountUnpowered tests: The unit is powered after the test to verify functionality.Random vibration2gRMS3x20minBump10g/16ms, 2-4 Hz1000 bumps in each of 6 directions7)Shock70g/12ms3 shocks in each of 6 directions7)Powered tests: The unit is tested with power applied.Sinusoidal vibrations 2.5mm, 5-10Hz2 hours in each of 3 directions7)1g, 10-100Hz2 hours in each of 3 directions7)Random vibrations0.01g, 10-20Hz0.7gRMS –3dB/oct, 20-150HzTable 17: Mechanical tests.7) 6 directions: (up, down, left, right forward and backward). 3 directions: (up and down, left and right, forward and backward)Page 8 of 28
ICEpower50ASX2, 2x50W or 1x170W ICEpower Amplifiers with integrated ICEpower SupplyVersion 1.1Typical Performance CharacteristicsFrequency Response (SE-version) 24 90 23 80 22 70 21 60 20 19 50 18 40 17 30 16 15 20 14dBgA 10 13 0 12 11deg-10 10-20 9-30 8 7-40 6-50 5 4-60 3-70 2-80 1-020501002005001k2k5k10k20k50k100k-90HzFigure 3: Frequency response in 4Ω (green), 8Ω (blue) and open load (red). Top – amplitude. Bottom – phase.Frequency Response (BTL-version) 34 90 32 80 30 70 28 60 50 26 40 24 30 22 20 20dBgA 10 18 0 16deg-10 14-20 12-30 10-40 8-50 6-60 4-70 2-80-020501002005001k2k5k10k20k50k100k-90HzFigure 4: Frequency response in 4Ω (green), 8Ω (blue) and open load (red). Top – amplitude. Bottom – phase.Page 9 of 28
ICEpower50ASX2, 2x50W or 1x170W ICEpower Amplifiers with integrated ICEpower SupplyVersion 1.1Harmonic Distortion & Noise 00m12510200.001100m50200m500m125WTHD N vs. Po at 100Hz, 1kHz and 6.67kHz 8) (8Ω). 0m1252050100THD N vs. Po at 100Hz, 1kHz and 6.67kHz 8) (4Ω), 115Vac/50Hz 0 150-150-160-170010WTHD N vs. Po at 100Hz, 1kHz and 6.67kHz 8) (8Ω), 115Vac/50HzA1000.10.05WdBr500.20.10.001100m20THD N vs. Po at 100Hz, 1kHz and 6.67kHz 8) (4Ω), e noise (16K FFT). Residual 25μV(A).(Relative to 50W into 4 ohm)20k22k-17002k4k6k8k10k12k14k16k18k20k22kHzf 5kHz. Po 100mW. 4Ω loading.(Relative to 50W into 4 ohm)Figure 5: Total harmonic distortion & noise (SE).8) An Audio Precision AES17 20 kHz 7th order measurement filter is used for measurements. The frequency 6.67 kHz corresponds to theworst-case situation where both 2nd and 3rd harmonics are within the audio band.Page 10 of 28
ICEpower50ASX2, 2x50W or 1x170W ICEpower Amplifiers with integrated ICEpower SupplyVersion 1.1Harmonic Distortion & Noise 00.0001100m200 300200m500m125WTHD N vs. Po at 100Hz, 1kHz and 6.67kHz 8) (8Ω). 200 01000.0001100m200 300200m500m125W2050100200 300THD N vs. Po at 100Hz, 1kHz and 6.67kHz 8) (4Ω), 115Vac/50Hz 0 150-150-160-170010WTHD N vs. Po at 100Hz, 1kHz and 6.67kHz 8) (8Ω), 115Vac/50HzA20THD N vs. Po at 100Hz, 1kHz and 6.67kHz 8) (4Ω), dle noise (16K FFT). Residual 25μV(A).(Relative to 170W into 4 ohm)20k22k-17002k4k6k8k10k12k14k16k18k20k22kHzf 5kHz. Po 100mW. 4Ω loading.(Relative to 170W into 4 ohm)Figure 6: Total harmonic distortion & noise (BTL).8) An Audio Precision AES17 20 kHz 7th order measurement filter is used for measurements. The frequency 6.67 kHz corresponds to theworst-case situation where both 2nd and 3rd harmonics are within the audio band.Page 11 of 28
ICEpower50ASX2, 2x50W or 1x170W ICEpower Amplifiers with integrated ICEpower SupplyVersion 1.1Intermodulation Distortion (CCIF & TIM) (SE-version)1 0k12k14k16k18k20k22k18k20k22kHzWCCIF IMD vs. PO, RL 4Ω, f1 18,5kHz, f2 1kHz,IMD@10W 0.0007%.CCIF IMD analysis. RL 4Ω, PO 10W.1 m200m500m12510WTIM vs. output power. RL 4Ω,TIM@10W 0.007%Figure 7: Intermodulation distortion (SE).Page 12 of 282050-17002k4k6k8k10k12k14k16kHzTIM FFT analysis. RL 4Ω, PO 10W.
ICEpower50ASX2, 2x50W or 1x170W ICEpower Amplifiers with integrated ICEpower SupplyVersion 1.1Intermodulation Distortion (CCIF & TIM) (BTL-version)1 k10k12k14k16k18k20k22k18k20k22kHzWCCIF IMD vs. PO, RL 4Ω, f1 18.5kHz, f2 1kHz,IMD@10W 0.0002%.CCIF IMD analysis. RL 4Ω, PO 10W.1 m200m500m1251020WTIM vs. output power. RL 4Ω,TIM@10W 0.003%Figure 8: Intermodulation distortion (BTL).Page 13 of 2850100200-17002k4k6k8k10k12k14k16kHzTIM FFT analysis. RL 4Ω, PO 10W.
ICEpower50ASX2, 2x50W or 1x170W ICEpower Amplifiers with integrated ICEpower SupplyVersion 1.1Power vs. FrequencyDue to the compensating Zobel network in the output stage, the maximum allowable short-term output poweris frequency-dependant. The short-term output power is defined as the maximum undistorted (THD N 1%)output power until thermal shutdown occurs. The maximum Full Power Bandwidth is 20 kHz. Above thisfrequency the Zobel protection circuit may briefly shutdown the amplifier to protect the Zobel network fromdamage.Note that this limitation will never cause any problems when the amplifier is fed a music signal at the input, butthe limit must be taken into consideration when the amplifier is tested under laboratory conditions using sinewaves or noise signals.Output impedanceThe output impedance is measured by feeding 1ARMS into the output of the amplifier and measuring the voltageon the output. The voltage then corresponds to the output impedance. The output impedance is measureddirectly on the terminals on the PCB.The figure below shows the output impedance from 100Hz – 20kHz for the 0m100m80m60m40m20m1002005001k2k5k10kHzFigure 9: Measured voltage at output terminals while feeding 1ARMS into the output of the amplifier at PCB.Page 14 of 2820k
ICEpower50ASX2, 2x50W or 1x170W ICEpower Amplifiers with integrated ICEpower SupplyVersion 1.1The figure below shows the output impedance from 100Hz – 20kHz for the 50m100m50m1002005001k2k5k10kHzFigure 10: Measured voltage at output terminals while feeding 1ARMS into the output of the amplifier at PCB.Page 15 of 2820k
ICEpower50ASX2, 2x50W or 1x170W ICEpower Amplifiers with integrated ICEpower SupplyVersion 1.1Dissipated Power vs. Output PowerSE-version115V/50HzMains Voltage VIN:SE-versionLoadRated powerimpedance [Ω] [W]Idle1/8 ratedpower (pinknoise)1/8 ratedpower (pinknoise)Continuousoutput powerContinuousoutput powerDissipatedpower [W]7445212x69825132x374431042 x 4318825602 x 2510Line power[W]Output power(bothchannels) [W]7Dissipatedpower [W]7447212x69827132x374431052 x 4319827632 x 279Table 18: Dissipated power vs. Output power (SE).Page 16 of 28Output power(bothchannels) [W]7230V/50HzMains Voltage VIN:SE-versionLoadRated powerimpedance [Ω] [W]Idle1/8 ratedpower (pinknoise)1/8 ratedpower (pinknoise)Continuousoutput powerContinuousoutput powerLine power[W]
ICEpower50ASX2, 2x50W or 1x170W ICEpower Amplifiers with integrated ICEpower SupplyVersion 1.1BTL power dissipation115V/50HzMains Voltage VIN:BTL-versionLoadRated powerimpedance [Ω] [W]Idle1/8 rated4150power (pinknoise)1/8 rated895power (pinknoise)Continuous450output powerContinuous895output power230V/50HzMains Voltage VIN:BTL-versionLoadRated powerimpedance [Ω] [W]Idle1/8 rated4170power (pinknoise)1/8 rated8100power (pinknoise)Continuous450output powerContinuous8100output powerLine power[W]7Output power[W]Dissipatedpower [W]7301911201286650161139518Line power[W]7Output power[W]Dissipatedpower [W]73221112113866501611610016Table 19: Dissipated power vs. Output power (BTL).LoadingWith its low output impedance, the ICEpower50ASX2 is designed to be unaffected by loudspeaker loadingcharacteristics. However, care should be taken with purely capacitive loads.Traditionally amplifiers have been tested extensively in laboratories with purely capacitive loads. This was done totest the amplifier’s stability and performance but it does not relate to any normal speaker load as evenelectrostatic speakers do not present a purely capacitive load to the amplifier but include a resistive part as well.The maximum purely capacitive load allowed is 470nF.Page 17 of 28
ICEpower50ASX2, 2x50W or 1x170W ICEpower Amplifiers with integrated ICEpower SupplyVersion 1.1FeaturesThe ICEpower50ASX2 has a number of useful features as described below.Over Current monitor pinFigure 11 shows the internal circuit of the OC pininterface. This pin is high ( 5V) under normalconditions. If a short circuit is detected on thespeaker output terminals the pin is pulled low (0V).This pin is also activated by other protectionfeatures such as Zobel protection, saturationdetection and DC protection on the output. If anyof these protection features are activated, the pinwill be pulled low (0V). This pin is only an output.Figure 11: Over Current monitor pin interface.Thermal monitor pinFigure 12 shows the internal circuit of the thermalpin interface. This pin is high ( 5V) under normalconditions. If the amplifier temperature becomestoo high the pin is pulled low (0V). This can happenif the continuous power drawn from the amplifierexceeds the limits listed on p. 6 and p. 7. This pin isonly an output.Figure 12: Thermal monitor pin interface.Enable pinThe enable pin can enable/disable the amplifier. Ifthe pin is left unconnected then the level is high( 5V), and the amplifier is enabled. If the pin ispulled low (0V) externally, the amplifier will bedisabled.The enable pin will also be pulled low by theinternal protection circuitry if the amplifiertemperature becomes too high or a mains undervoltage is detected. This pin is bidirectional.Figure 13: Enable pin interface.Page 18 of 28
ICEpower50ASX2, 2x50W or 1x170W ICEpower Amplifiers with integrated ICEpower SupplyAuxiliary Power SupplyThe auxiliary supply can be used to power anexternal circuit such as a preamplifier or anequalizer/crossover. Remember that this supply isunregulated.When using this AUX supply, please remember toread the sections “Shielding and Grounding ofAudio Signals” and “Capacitive Loading of the AuxSupply” in the ICEpower50ASX Designer’s Manual.NOTE:The Vd and Vs outputs are fused. Even briefoverload or short circuit will blow the fuses!To maintain long term power handling and theeffects of inrush current, the fuses on the moduleare 400mA types. To ensure no unexpected burningof the fuse, the maximum output current drawnfrom the aux supply should not exceed 200mA.Figure 14: Auxiliary supply equivalent diagram.Page 19 of 28Version 1.1
ICEpower50ASX2, 2x50W or 1x170W ICEpower Amplifiers with integrated ICEpower SupplyVersion 1.1Protection FeaturesThe ICEpower50ASX2 is equipped with several protection features for surviving overload without damage.The block diagram below illustrates the different protection features.Figure 15: Protection schematicPower Supply ProtectionThe power supply of the ICEpower50ASX has 2 protection circuits; overtemperature and overcurrent.The temperature protection will be activated if the absolute temperature of the circuit is too high. This can becaused by high ambient temperature, high load (amplifier and AUX supply) for a long time or a combination ofthese two parameters.The over current protection will be activated if the output current to amplifier and AUX is too large. Pleaseremember that the AUX supply is protected by fuses.If one of these protection features is triggered, the power supply either limits its output power or shuts down. Incase of a shut down the power supply will rapidly try to restart if the circuit’s temperature is OK.Page 20 of 28
ICEpower50ASX2, 2x50W or 1x170W ICEpower Amplifiers with integrated ICEpower SupplyVersion 1.1Amplifier Local ProtectionThe ICEpower50ASX2 has a local protection circuit for each of the two audio channels. This local protectionhandles HF protection, DC protection and saturation detection. If one of these protections features becomesactive on one channel it will only influence on the channel where the error occurred.The HF protection circuit is implemented to protect the Zobel network against ultrasonic signals (greater than20kHz). This protection circuit has a build-in time constant, so it is possible to deliver a high frequency, highamplitude signal for a short time.Amplifier Global ProtectionThere is two global protection features in the 50ASX2 amplifier; an over temperature protection and an overcurrent protection.The over temperature protection will only occur if the PRMS is greater that the specified Continuous OutputPower. In normal use the amplifier will not shut down if properly mounted.The over current detection circuit is included in the ICEpower chipset by detecting saturation of the controlsystem. This condition will typically be allowed in 100ms to 500ms which is enough to avoid accidentalshutdown at peak currents during high music output. The current limit is set to 20A.Input/Output InterfaceInput StageThe single ended input buffer has an anti-aliasingfiltering and a DC capacitor. The input impedanceof the signal input section is minimum 8kΩ over theaudio bandwidth, which is an acceptable loadingcondition for pre-amps, active crossover outputsetc.Figure 16: Single ended input buffer.Page 21 of 28
ICEpower50ASX2, 2x50W or 1x170W ICEpower Amplifiers with integrated ICEpower SupplyVersion 1.1BTL module setup:When using the BTL module the wiring diagram onfig. 17 should be followed. Note that it is thechannel 2 speaker terminal which is used on theBTL module (the channel 1 terminal is not mountedon the board).Figure 17: Wiring diagram for the BTL moduleOutput stageThe output stage is a half bridge topology with a2nd order filter. The filter design is a part ofICEpower’s proprietary MECC topology and hasbeen chosen as the optimal solution betweendemodulation characteristics, efficiency and filtercompactness. The essential output characteristicsare: The switching residual on the output primarilyconsists of a single frequency component at thecarrier fundamental fs.The system bandwidth is 130 kHz in 8Ω (SE) and100 kHz in 8Ω (BTL).Page 22 of 28Figure 18: SE output filter section with compensating Zobelnetwork.
ICEpower50ASX2, 2x50W or 1x170W ICEpower Amplifiers with integrated ICEpower SupplyVersion 1.1Operational Timing DiagramThe following diagram show selected signals during power up/down (nominal mains).Timing for changes in mains and enable levels1.2.3.4.5.6.700ms typ.2ms typ.100us typ.2ms typ.1200ms max. (load/power dependent)50ms typ.OC and Thermal pins have the same responsedelays as the Enable pin from when the OC orthermal error is detected.Figure 19: Timing – enable and mains.Thermal DesignThermal design is generally a great challenge in power amplifier systems. Linear amplifier designs operating inclass A or AB are normally very inefficient and therefore equipped with extensive heat sinking to keep thetransistor junction temperature low. The ICEpower50ASX2 is based on highly efficient ICEpower switchingtechnology providing high overall efficiency characteristics at all levels of operation.Part of the “component” philosophy of the ICEpower50ASX2 module is to provide a self-cooled componentthus eliminating the need for special attention to thermal design.The ICEpower50ASX module is designed for music reproduction, which means that the output power of theamplifier will never be continuous. Research has shown that the RMS level of any music signal does
Pmax Time of maximum rated output power 170W out. No preheating. - 120 - s P T Continuous output power 4) without thermal shutdown. (SE, 4Ω) Both channels driven Thermal stab. @ T a 25 OC. - 43 - W P T Continuous output power 4) without thermal shutdown. (SE, 8Ω) Both channels driven Thermal stab. @ T a 25 OC. - 30 - W P T Continuous .
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