Users Manual for CDA-254 Class D Audio Power Amplifier
Contents
1. VVVVVYVVVVVVVV s YOU ARE NOT ENTITLED TO RECOVER FROM US ANY INCIDENTAL DAMAGES RESULTING FROM ANY DEFECT IN THE NEW CLASS D AUDIO PRODUCT THIS INCLUDES ANY DAMAGE TO ANOTHER s PRODUCT OR PRODUCTS RESULTING FROM SUCH A DEFECT HOW TO OBTAIN WARRANTY SERVICE VVYVVVVYVVVVVVVV You must contact us at service classdaudio com for warranty service within the warranty period s All components must be shipped in the original box Corrective action will be taken within a reason s z able time of the date of receipt of the defective product by our authorized service center If the re 3 pairs made by our authorized service center are not satisfactory notify our authorized service cen ter immediately V gt MAMMA AAA AAA AAA AA AAA AAA A AAA A AAA AAA AAA AAA AA AA AAA AAA AA AAA AAA AAA AAA AAA AA AAA AAA AAA AAA AAA AA AA AAA AAA AA AAA AAA AAA AA ANA Copyright 2009 class D audio All Rights Reserved www classDaudio com 11 AAA AAA AAA AAA AAA AAA AAA A AAAAAAA A AAA AAA AAA A AAA AAA AAAAAAAA AAA AN class FD audio Copyright 2009 class D audio All Rights Reserved www classDaudio com2. ad ore vite ne We gt ee Features e Stereo or Bridged Configuration e Power On Off Switch e Power and Error LED s e Click amp Pop Noise Reduction e Over Temperature Protection e Over Under Voltage Protection e Over Under Current Protection e MOSFET DC Protection e Housekeeping Power Supplies e Small Size 4 5 X 4 25 X 1 25 io ae DA VS ge Class D Audio Power Amplifier 250W X 2 or 500W X 1 RMS Power Users Manual Please take the time to carefully read and un derstand this users manual and be sure to pay close attention to the safety instructions and operating procedures Only 4 1 2 X 4 1 4 and 1 1 4 High Small Size BIG POWER Class D Amps are very efficientand 5 use half the energy of most other amps 8 gt A LA aD Specifications aA e Output 250W X 2 4 Ohm 125W XK 2 8 Ohm e Bridged Output 500W X 1 Bridged 8 Ohm e THD N 1W 1KHz 02 e Dynamic Range 101 db e Efficiency Over 90 For more information please visit us at e Required Power Supply 45 to 60V www classDaudio com email info classdaudio com Copyright 2009 class D audio All Rights Reserved www classDaudio com L class audio Incredible Sound Affordable price Made in the USA SAFETY PRECAUTIONS IMPORTANT SAFEGUARDS PLEASE READ CAREFULLY ALL THE FOLLOWING IMPORTANT SAFEGUARDS THAT ARE APPLICABLE TO YOUR EQUIPMENT AND YOUR SAFETY
3. 10 Care should be taken to prevent objects from falling and liquids from spilling into the unit Do not subject the unit to excessive smoke dust vibration or shock 11 During experimenting make sure that all jumpers are properly seated in the correct position and that there are no foreign objects or solder bridges 12 Always wear protective glasses and exercise caution when powering unit after any change is made If possible gradually rise input voltage and look for any abnormalities smell or smoke overheating etc 13 If you have any questions regarding safe and reliable operation of your amplifier please email us at support classdaudio com Dear Customer The staff at Class D Audio would like to take this opportunity to congratulate and thank you for purchasing this high quality Class D Audio Amplifier We are confi dent that your amplifier will be a pleasure to use and will provide you with many years of listening pleasure Before using this amplifier please take the time to carefully read and understand this users manual and pay close attention to the safety instructions and operating procedures Becoming familiar with all the details about your amplifier will ensure safe usage and reliable operation Take special care when working with high volt ages and making adjustments The effort you invest now will be well rewarded as time goes by Please don t hesitate to contact us at support classdaudio com with any question
4. 1 Read the User s Manual completely and refer to it frequently 2 Retain the User s Manual for future reference 3 All warnings should be strictly adhered to 4 This product should be operated using only the type of power source indicated in this manual 5 Power supply cords and all connecting cables or wires should be routed so that they are not likely to be walked on or pinched Pay particular attention to cords and cables at plugs recep tacles and terminal blocks Always use wires with adequate ratings and safety certifications CE UL etc 6 Your audio amplifier has been designed with your safety in mind However no design can Completely protect against incorrect use Electrical circuits can be dangerous and or lethal when a lack of caution or poor safety practice is used Use caution in the presence of voltage above 24V as this poses a shock hazard 7 Turn off the unit as soon as you stop actively using it Unplug the power supply from the wall during a lightning storm or when the product is to be left unattended and unused for longer periods of time 8 Do not use this product near water or in wet areas Damp basements should be avoided 9 Proper ventilation is crucial for safe and reliable operation Never place anything on top of your amplifier that could obstruct airflow and cause the parts to overheat and damage the ampli fier Do not place your amplifier in a rack or bookcase unless proper ventilation is provided
5. order sigma delta modulation hav ing a Class D switching stage inside the loop The benefit of the sigma delta modula tion in comparison to the carrier signal based modulation is that all the error in the audible frequency range is shifted to the inaudible upper frequency range by nature of its operation You will find when listening to this amplifier a very clean somewhat warm sound along with a powerful and effortless bass response Protection Circuitry The amplifier has built in over current protection over voltage protection under voltage protection speaker DC offset protection and over temperature protection In the event that any of these external fault conditions are detected the amplifier circuitry will disable the output turning on the yellow LEDs and turning off blue LEDs If the fault condition persists the protection circuit stays in shutdown until the fault is re moved Once the fault is cleared the blue LEDs turn on and yellow LEDs turn off If the error is only in one channel then only that channel will be effected Input On the input side of the board you will notice 2 RCA input jacks for the left and right channels These are analog inputs for the right and left channel signal source preamp or A proper input signal is an analog signal ranging from 20Hz to 20KHz with up to 3 VRMS amplitude with a source impedance of no more than 600 Q When using the amplifier in bridged mode place the stereo bridged jumper in b
6. dB at 1kKHz and accepts any power supply topology as long as the supply voltages fit in the min and max range Heat sink With it s high efficiency the amplifier can handle one eighth of the continuous rated power without additional heatsink or forced air cooling One eighth watt is generally considered to be a normal operating condition for safety standards If the heatsink temperature rises above 100 C the over temperature protection shuts down both channels turning on the yellow LEDs Once the amplifier cools down it will recover the blue LEDs will turn back on and the amplifier will resume normal operation ON OFF Switch You will see the small ON OFF switch protruding from the lower right side of the power amplifier In the OFF position the power switch forces the amplifier to stay in shutdown standby mode During the shutdown mode the yellow LEDs are on blue LEDs are off and the output MOSFETs are kept off When you put the switch in the ON position the yellow LED s will turn off and the blue LEDS will turn on after about a 1 second delay At this stage when the blue LEDs are on the amplifier is running and operating normally We used a small switch because we recognize that most people will choose to mount the amp in an enclosure Provisions for an external power switch are provided on the PCB and you will see how to utilize it in the following pages Click amp Pop Noise Reduction A Click and pop noise elimination funct
7. gt ANN 7 19 un L n R30 Bho N o E e a r a i 4 gt i j z n NC 6 ris i 47 Li f 3 r gt aN p y en fam LA e i n A es Hal SRE hg ere TUE es wer a i S T3 Beha t ESIR 3 ke FSI P PILR5 R4 R3 C ES SIL ON Me CCE AS Power Switch DO NOT TOUCH P2 and P3 are potentiometers that are used to adjust the switching frequency of the amplifier They are factory pre set and no further adjustment is required The slightest move or adjustment will put the amplifier out of sync and possibly cause damage The above photo shows potentiometers P2 and P3 Please do not touch or try to adjust these by yourself The potentiometers are factory pre set to 400KHz 25KHz At Higher frequencies distortion due to switching time becomes significant At lower frequencies the bandwidth suffers The adjustment is very sensitive and the slightest movement will put the amplifiers out of tolerance so please do not touch them and make sure they do not get bumped or knocked out of position This is not likely to happen but still use care when handling the amplifier If you choose to experiment with the adjustment of these potentiometers you do so at your own risk and will you will void your warranty The power switch is shown here only to show it s location because it s a little hard to see from the top view photos You can also add an external power switch Details are show
8. ion is built into the amplifier so it does not re quire any additional components for this function Is most circumstances you will not hear any pop or click noise when turning on or off the amplifier Efficiency The amplifiers high efficiency of over 90 is achieved due to several factors such as low conduction loss due to the dual FETs offering low Rps on low switching loss due to the dual FETs offering low input capacitance for fast rise and fall times and secure dead time provided by the driver ICs avoiding cross conduction The PCB printed circuit board is clearly marked on the top and bottom side for safe and easy connections Connecting the Amplifier gt BridgedMode Use Right ang mb ri Outputs ny Right Power Supply Left Speaker Input Speaker Stereo Mode Only Stereo Mode Only Improper Power Supply Connection will Damage the Amp and Void your Warranty ON OFF Run Standby Error LED s r onfO CLASS D AUC IGE LIFIER iO Ol on Required Power Supply O pi Dual DC DC Power ee m L OFF R EEJ Lx dn i ay gE A z a 7 x Switch L FR Bri es Use Left Input Only iged Use amp Speaker mie I EXT POWER r gt SWITCH gt J a gt i Bridgec Team America Input Technologies inc CDA2092X2NR Stereo Left Input or Bridged Right Input Only use Left Input in Bridged Mode Mode Jumper Precautions be
9. n on page 9 of this manual Adding External LEDs amp Power Switch Only attempt these modifications if you are experienced in electronics Y E ong Left Channel 2 a A Right Channel Blue LED EE Etc LED os siah i CLASS D AUDIO AMPLIFIER Go n 7 oo O Power Supply Dual DC DC 5 a0 t gt s re pa gt Y neue 4 OFF 6 T OFF Bridged Use Left Input Only Bridged Use amp Speaker Outputs aar 7 A saji Q AK Lo Jamo O CA f Required z as HA i Ar A O R y 4 BRIDGED aSTEREO Ah ist ir Donation Fe 3 FF O i fmm Team A nerica FN LEFT RIGH Technolc jies Inc INPEF B a CDA20 2X2NR Left Channel Right Channel Yellow LED Yellow LED This amplifier was designed with provisions for an external power switch connectors and LEDs for easy mounting in an enclosure Only a SPST switch two blue and two yellow LEDs and some wire is needed When using an external power switch leave the onboard switch in the on position permanently When installing external LEDs be sure to note the sign showing the pole position for the LEDs The onboard terminal blocks and RCA jacks for inputs power supply and speaker outputs can be removed and soldered directly to the PCB board for a permanent instillation These amplifiers can also be ordered from us without the RCA jacks and terminal blocks for easier and permanent installations Existing LEDs can be
10. product which occurred within the Warranty Period It does not cover any product which has been damaged because of any inten tional or unintentional misuse accident or negligence It does not cover any loss or damage which is cov S ered under any of your insurance contracts This Class D Audio Warranty also does not extend to the new Class D Audio product if the serial number has been defaced altered or removed or if the product has been modified or altered in any way WHAT THE WARRANTOR WILL DO VVYVVYYVVVYVVVVVVVV z We will remedy any defect regardless of the reason for failure except as excluded by repair or replace VVYVYYVVYVYVVYVVYVYVYVVVYVVYVVYVYVVYVYVYYVVYVYVVYVVYVYVVYVYVVYVVYVYVYVYVYVYYVVYVYVVYVVYYVVYVYVVYVVYVYVVYVYVYVVYVYVVYVVYVYVVYVVYVVYVVYVYVVVVVYVVYVYVVYVVYVYVVVVYVVYVVYVYVVVVVVVVVYVVVVV ment We will remedy the defect and ship the product from the service center or our factory within a reason able time after receipt of the defective product at our authorized service center or our factory All expenses in remedying the defect including surface shipping costs in the United States will be borne by us You 3 z must bear the expense of shipping the product between any foreign country and the port of entry in the United States including the return shipment and all taxes duties and other customs fees for such foreign VV a D 3 OD 5 rm O DISCLAIMER OF CONSEQUENTIAL AND INCIDENTAL DAMAGES
11. removed or left on the PCB FINAL WORDS Once again thank you for your purchase We hope that this Class D Audio Power Am plifier will give you hours and hours of enjoyment as you experience the multitude of different qualities that Class D Audio presents Also please don t forget to take extreme caution while working with high voltages If you are not thoroughly familiar with the safety procedures feel free to enlist the help of someone with experience in this field of work There are many very knowledgeable people in online internet forums and most are happy to help as they all share a pas sion for spreading the art and science of high quality sound reproduction Thank you for Doing Your Part for the Environment Class D Amps are very efficient and use only about half the energy of most other amplifiers class audio Warranty SUMMARY OF WARRANTY VVYVVVVYVVVVVVV Class D Audio warrants to you the ORIGINAL PURCHASER of each NEW Class D Audio product for a period of one 1 year from the date of purchase by the original purchaser the warranty period that the new Class D Audio product is free of defects in materials and workmanship We further warrant the new Class D Audio product regardless of the reason for failure except as excluded in this Warranty ITEMS EXCLUDED FROM THIS CLASS D AUDIO WARRANTY VVYVYVVVYVVVYVVV This Class D Audio Warranty is in effect only for failure of a new Class D Audio
12. ridged mode and use only the left input as clearly marked on the PCB Output The left and right speaker terminal blocks are located on either side of the power sup ply input terminal block The amplifier is designed for loads of 4 Ohm or 8 Ohm Maxi mum output power depends on the value of the load and the power supply voltage With a 4 Ohm load and a power supply voltage of 50 Volt an output power of 250W RMS per channel can be achieved an 8 Ohm load will be 125W RMS per channel and in bridged mode 500W RMS into an 8 Ohm load Please note the PCB is clearly marked on the top and bottom side When attaching speakers please be sure to con nect them to the proper polarity and or you will hear an out of phase and hollow sound coming from your speakers When using the amplifier bridged mode connect the speaker to the right and left channel and positive speaker outputs only Power supply A dual bipolar DC power supply of 45 to 60 Volt should be connected to the terminals V GND V of the 3 position terminal block shown in photo on following page The minimum supply voltage is 45V and the maximum value is 60V Any value below or above the stated value and the amplifier will not turn on due to the un der voltage and over voltage protection that is built into this amplifier The current ca pability of the power supply depends on the load and the voltage The amplifier has a good power supply rejection ratio of 65
13. s you have With best regards The staff of classDaudio com class FD audio WARNING This amplifier module is not intended for beginners It requires familiarity with safe procedures for tests measurements and usage of high voltage equipment Exercise extreme caution when working with high voltages and always unplug the power before making any changes or adjustments Electricity can cause severe injuries even with low voltages or currents Therefore it is extremely important for you to read the following information before using your Class D Audio Amplifier This amplifier module must only be used and operated by a compe tent person and in strict accordance with the instructions We will not accept liability for any damage or injury caused by misuse non compliance or failure to follow safety procedures Please read this entire manual before making any connections to the amplifier Be sure to read and adhere to all safety measures precautions and warnings General The CDA2092X2NR is a high quality two channel Class D audio power amplifier that features selectable half bridge stereo and full bridge bridged modes The amplifier module is capable of driving an 8 Ohm or 4 Ohm load in stereo mode and 8 Ohm load in bridged mode This amplifier uses high voltage high speed driver ICs that feature a self oscillating type PWM modulator for an extremely high performance design This topology represents an analog version of a second
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