Philips TFA9843AJ User's Manual
Contents
1. 100 10 102 103 104 105 Voc 18 V RL 4Q Fig 9 Channel separation as a function of frequency no bandpass filter applied mce497 SVRR dB NOE 10 102 103 104 10 f Hz Voc 18 V Zs 0 Q Vripple 300 mV RMS a bandpass filter of 20 Hz to 22 kHz has been applied inputs short circuited Fig 10 Supply voltage ripple rejection as a function of frequency TFA9843AJ_1 Koninklijke Philips Electronics N V 2006 All rights reserved Preliminary data sheet Rev 01 28 April 2006 9 of 19 Philips Semiconductors TFA9843AJ 20 W stereo power amplifier with volume control 13 Application information 13 1 13 1 1 TFA9843AJ_1 Application diagrams Single ended application a i A GND Fig 11 SE application diagram 001aae430 i Vcc 100 nF 1000 uF A TIT AL IN1 e oun i 7 vi D 1000F t RL 40 ae 77 aL IN2 2 OUT2 T z vi 1000F RL ids K SHORT CIRCUIT 5 TEMPERATURE D REF PROTECTION VC VOLUME A CONTROL MICRO CONTROLLER TFA9843AJ e EA 22 uF 10 nF 150 uF Vcc Remark By switching induc2. THD 10 Fig 4 Output power one channel as a function of Po W Voc 18 V f 1kHz R 42 Fig 5 Total harmonic distortion plus noise as a function of output power voltage supply voltage for various loads 102 mce488 10 001aaa446 THD N THD N 10 1 1 10 1 10 1 10 2 10 2 10 1 1 10 102 10 102 103 104 105 f Hz Vcc 18 V Po 1W RL 4Q Fig 6 Total harmonic distortion plus noise as a function of frequency TFA9843AJ_1 Koninklijke Philips Electronics N V 2006 All rights reserved Preliminary data sheet Rev 01 28 April 2006 8 of 19 Philips Semiconductors TFA9843AJ 20 W stereo power amplifier with volume control mce491 30 20 Voc V THD 10 RL 4 Q f 1 kHz Fig 7 Output power as a function of supply voltage mce507 10 Prot W Po W Voc 18 V RL 42 Fig 8 Total power dissipation as a function of channel output power per channel worst case both channels driven mce495
3. 28 April 2006 6 of 19 Philips Semiconductors TFA9843AJ 11 Static characteristics Table 8 Static characteristics 20 W stereo power amplifier with volume control Voc 18 V Tamb 25 C R1 4 Q Vive Voc Vi 0 V measured in test circuit of Figure 11 unless otherwise specified Symbol Voc lq loc stb Vo Vive lve Parameter supply voltage quiescent current standby supply current output voltage input voltage on pin VC input current on pin VC Conditions operating Ri Voc 18 V Vive lt 0 8V On mode maximum gain Volume control mode Mute mode Standby mode 0 V lt Vive lt Voc Min Typ 0l 9 18 60 2 9 5 0 gt 1 5 1 2 0 2 Max 28 100 150 Voc 5 0 1 5 0 8 20 Unit V mA uA lt uA 1 A minimum load of 3 Q is allowed at supply voltages gt 22 V 2 The DC output voltage with respect to ground is approximately 0 5Vcc 12 Dynamic characteristics Table 9 Dynamic characteristics SE Voc 18 V Tamb 25 C R 4 Q f 1 kHz Vivo Vcc measured in test circuit of Figure 11 unless otherwise specified Symbol Parameter Conditions Min Typ Max Unit Po output power THD 10 RL 42 7 8 5 W THD 0 5 RL 4Q 6 5 W Voc 22 V 14 W THD 10 RL 4 2 THD total harmonic Po 1W 0 1 0 5 distortion Gymax maximum voltage gain Vyyc gt 5 0 V 25 26 27 dB AG voltage gain range 1
4. Philips Semiconductors TFA9843AJ 20 W stereo power amplifier with volume control mce504 150 1 2 3 4 Tj CC 100 5 50 0 8 12 16 20 24 28 Voc V 1 R 2Q 2 RL 4Q 3 RL 62 4 RL 8 5 RL 169 2 x SE loads Tamb 25 C external heatsink of 10 K W music signals Fig 16 Junction temperature as a function of supply voltage 14 Test information 14 1 Quality information The General Quality Specification for Integrated Circuits SNW FQ 611 is applicable TFA9843AJ_1 Koninklijke Philips Electronics N V 2006 All rights reserved Preliminary data sheet Rev 01 28 April 2006 14 of 19 Philips Semiconductors TFA9843AJ 20 W stereo power amplifier with volume control 15 Package outline DBS9P plastic DIL bent SIL power package 9 leads lead length 12 11 mm exposed die pad SOT523 1 non concave x view B mounting base side gt DIMENSIONS mm are the original dimensions UNIT Ap by c D D4 Dy EM Ep 2 7 0 80 0 58 13 2 6 2 35 14 7 35 12 4 2 3 0 65 0 48 12 8 5 8 14 3 f 11 0 mm Notes 1 Plastic or metal protrusions of
5. 0 25 mm maximum per side are not included 2 Plastic surface within circle area D4 may protrude 0 04 mm maximum OUTLINE REFERENCES EUROPEAN VERSION IEC JEDEC JEITA PROJECTION SOT523 1 03 03 12 ISSUE DATE Fig 17 Package outline SOT523 1 DBS9P TFA9843AJ_1 Koninklijke Philips Electronics N V 2006 All rights reserved Preliminary data sheet Rev 01 28 April 2006 15 of 19 Philips Semiconductors TFA9843AJ 20 W stereo power amplifier with volume control 16 Soldering 16 1 Introduction to soldering through hole mount packages This text gives a brief insight to wave dip and manual soldering A more in depth account of soldering ICs can be found in our Data Handbook IC 26 Integrated Circuit Packages document order number 9398 652 90011 Wave soldering is the preferred method for mounting of through hole mount IC packages on a printed circuit board 16 2 Soldering by dipping or by solder wave Driven by legislation and environmental forces the worldwide use of lead free solder pastes is increasing Typical dwell time of the leads in the wave ranges from 3 seconds to 4 seconds at 250 C or 265 C depending on solder material applied SnPb or Pb free respectively The total contact time of successive solder waves must not exceed 5 seconds The device may be mounted up to the seating plane but the temperature of the plastic body must not exceed the specified max
6. 5 V lt Vivo lt 5 0 V z 80 dB Vi input voltage gain 0 dB 1 0 V THD lt 1 Zi input impedance 40 60 kQ Vaio noise output voltage 0l 150 uV SVRR supply voltage ripple ripple 1 KHZ 2 60 dB rejection fripple 100 Hz to 2 60 dB 20 kHz Vo mute mute output voltage B 150 uV Acs channel separation Zs 0Q 50 60 dB AGyimax l_ maximum voltage gain 1 dB difference TFA9843AJ_1 Koninklijke Philips Electronics N V 2006 All rights reserved Preliminary data sheet Rev 01 28 April 2006 7 of 19 Philips Semiconductors TFA9843AJ 20 W stereo power amplifier with volume control 1 The noise output voltage is measured at the output in a frequency range from 20 Hz to 22 kHz unweighted with a source impedance Zs 0 Q at the input 2 Supply voltage ripple rejection is measured at the output with a source impedance Zs 0 Q at the input and with a frequency range from 20 Hz to 22 kHz unweighted The ripple voltage is a sine wave with a frequency frippie and an amplitude of 300 mV RMS which is applied to the positive supply rail 3 Output voltage in Mute mode Vivo 1 35 V and an input voltage of 1 V RMS in a bandwidth from 20 Hz to 22 kHz including noise 001aae340 50 dB 100 150 0 2 0 4 0 6 0 Vive V Voc 18 V Fig 3 Voltage gain as a function of volume control mce485 20
7. Functional description 8 1 8 2 8 2 1 TFA9843AJ_1 Input configuration The input cut off frequency is as follows _ 1 Fi 3aB 2n R x C 1 Single ended application Rj 60 kQ and C 220 nF 1 fisan gt y 12 Hz 2 2n 60 x 10 x 220x 10 As shown in Equation 2 large capacitor values for the inputs are not necessary therefore switch on delay during charging of the input capacitors can be minimized This results in a good low frequency response and good switch on behavior The TFA9843Au has clamps on the inputs In Standby mode the voltage on the input pins is clamped for voltages lower than 0 1 V When the TFA9843AJ is in Mute Volume control or Operating mode maximum gain the input clamp voltage is 1 V RMS Power amplifier The power amplifier is a single ended amplifier with an all NPN output stage capable of delivering a peak output current of 4 A Output power measurement The output power as a function of the supply voltage is measured on the output pins at THD 10 see Figure 7 The maximum output power is limited by the supply voltage of 26 V and the maximum available output current is 4 A repetitive peak current A minimum load of 3 Q is required for supply voltages gt 22 V see Figure 4 The output power is measured with one channel driven Koninklijke Philips Electronics N V 2006 All rights reserved Preliminary data sheet Rev 01 28 April 2006 4 of 1
8. 9 Philips Semiconductors TFA9843AJ 8 2 2 8 3 8 4 TFA9843AJ_1 20 W stereo power amplifier with volume control Headroom Typical CD music requires at least 12 dB factor 15 85 dynamic headroom compared to the average power output for transferring the loudest parts without distortion At Voc 18 V and Py 6 5 W SE with R 4 Q at THD lt 0 5 see Figure 5 the Average Listening Level ALL music power without any distortion yields 6 5 Po ALt SE J555 410 mW 3 The power dissipation can be derived from Figure 8 SE for 0 dB respectively 12 dB headroom see Table 4 For the average listening level a power dissipation of 4 2 W can be used for a heatsink calculation Table 4 Power rating as function of headroom Headroom Power output THD lt 0 5 Power dissipation P SE both channels driven 0 dB Po 6 5 W 8 2 W 12 dB Po ALL 410 mW 4 2 W Mode selection The TFA9843AJ has four functional modes which can be selected by applying the proper DC voltage to pin VC see Table 5 Table 5 Mode selection Vive Status Definition 0 V to 0 8 V Standby in this mode the current consumption is very low and the outputs are floating the device is in Standby mode when Vivo lt 0 8 V 1 2Vto1 5V Mute in this mode the amplifier is DC biased but not operational no audio output this allows the input coupling capacitors to be charged to avoid plop noise the device is in Mute mode when 1 2V
9. AJ_1 Koninklijke Philips Electronics N V 2006 All rights reserved Preliminary data sheet Rev 01 28 April 2006 17 of 19 Philips Semiconductors TFA9843AJ 18 Legal information 18 1 Data sheet status 20 W stereo power amplifier with volume control Document status JI2 Product status Definition Objective short data sheet Development Preliminary short data sheet Qualification Product short data sheet Production This document contains data from the objective specification for product development This document contains data from the preliminary specification This document contains the product specification 1 Please consult the most recently issued document before initiating or completing a design 2 The term short data sheet is explained in section Definitions 3 The product status of device s described in this document may have changed since this document was published and may differ in case of multiple devices The latest product status information is available on the Internet at URL http www semiconductors philips com 18 2 Definitions Draft The document is a draft version only The content is still under internal review and subject to formal approval which may result in modifications or additions Philips Semiconductors does not give any representations or warranties as to the accuracy or completeness of information included herein and shall have no li
10. TFA9843AJ 20 W stereo power amplifier with volume control Rev 01 28 April 2006 Preliminary data sheet 1 General description 2 Features The TFA9843AJ contains two identical audio power amplifiers The TFA9843AJ can be used as two Single Ended SE channels with a volume control The maximum gain is 26 dB The TFA9843AJ comes in a 9 pin DIL bent SIL DBS9P power package The TFA9843AJ is pin compatible with the TFA9842AJ TFA9843 B J TFA9842 B J and TFA9841J The difference between the TFA9843AJ and the TFA9843 B J TFA9842 B J TFA9841J is the functionality of pin 7 The TFA9843Au has a volume control on pin 7 VC The TFA9843 B J TFA9842 B J and TFA9841J have a mode select on pin 7 MODE The TFA9843Au contains a unique protection circuit that is solely based on multiple temperature measurements inside the chip This gives maximum output power for all supply voltages and load conditions with no unnecessary audio holes Almost any supply voltage and load impedance combination can be made as long as thermal boundary conditions number of channels used external heatsink and ambient temperature allow it 2 channel SE 1 W to 20 W operation possibility Soft clipping Input clamps Volume control Standby and Mute mode No on or off switching plops Low standby current High supply voltage ripple rejection Outputs short circuit protected to ground supply and across the load Thermally protected Pin compatible with th
11. ability for the consequences of use of such information Short data sheet A short data sheet is an extract from a full data sheet with the same product type number s and title A short data sheet is intended for quick reference only and should not be relied upon to contain detailed and full information For detailed and full information see the relevant full data sheet which is available on request via the local Philips Semiconductors sales office In case of any inconsistency or conflict with the short data sheet the full data sheet shall prevail 18 3 Disclaimers General Information in this document is believed to be accurate and reliable However Philips Semiconductors does not give any representations or warranties expressed or implied as to the accuracy or completeness of such information and shall have no liability for the consequences of use of such information Right to make changes Philips Semiconductors reserves the right to make changes to information published in this document including without limitation specifications and product descriptions at any time and without notice This document supersedes and replaces all information supplied prior to the publication hereof Suitability for use Philips Semiconductors products are not designed authorized or warranted to be suitable for use in medical military aircraft space or life support equipment nor in applications where failure or 19 Contact informati
12. e TFA9842AJ TFA9843 B J TFA9842 B J TFA9841J 3 Applications E CRT TV and LCD TV E Monitors E PC speakers E Boom box E Mini and micro audio receivers PHILIPS Philips Semiconductors TFA9843AJ 4 Quick reference data Table 1 Quick reference data 20 W stereo power amplifier with volume control Voc 18 V Tamb 25 C Ri 4 Q Vive Voc Vi 0 V measured in test circuit of Figure 11 unless otherwise specified Symbol Voc Iq Icc stb Po THD Gvmax AGy SVRR Parameter supply voltage quiescent current standby supply current output power total harmonic distortion maximum voltage gain voltage gain range supply voltage ripple rejection Conditions operating Voc 18 V RL Voc 18 V Vivo lt 0 8 V THD 10 RL 4Q Vcc 18 V THD 10 RL 4Q Vcc 22 V Po 1W Vivo gt 5 0V 1 5V lt Vive lt 5 0V f 1 kHz Min Typ fl 9 18 60 7 8 5 14 0 1 25 26 80 2l 60 Max 28 100 150 0 5 27 Unit V mA uA WwW WwW dB dB dB 1 A minimum load of 3 Q is allowed at supply voltages gt 22 V 2 Supply voltage ripple rejection is measured at the output with a source impedance Zs 0 Q at the input and with a frequency range from 20 Hz to 22 kHz unweighted The ripple voltage is a sine wave with a frequency frippie and an amplitude of 300 mV RMS which is applied to the positive supply rail 5 Order
13. eo power amplifier with volume control 13 3 Thermal behavior and heatsink calculation TFA9843AJ_1 The measured maximum thermal resistance of the IC package Rthyj mb is 2 0 K W A calculation for the heatsink can be made with the following parameters Tamb max 60 C example Voc 18 V and R 4 Q SE Timax 150 C specification Rinitot is the total thermal resistance between the junction and the ambient including the heatsink This can be calculated using the maximum temperature increase divided by the power dissipation Rthitot Tmax Tamb max P At Vcc 18 V and R 4 Q 2 x SE the measured worst case sine wave dissipation is 8 4 W see Figure 8 For Tjmax 150 C the temperature raise caused by the power dissipation is 150 60 90 C Px Rihtot 90 C Rinto 90 8 4 K W 10 7 K W Rth h a Rthtot Rth mb 10 7 K W 2 0 K W 8 7 K W This calculation is for an application at worst case stereo sine wave output signals In practice music signals will be applied which decreases the maximum power dissipation to approximately half of the sine wave power dissipation see Section 8 2 2 This allows the use of a smaller heatsink Px Rih tot 90 C Rthitot 90 4 2 K W 21 4 K W Rth h a Rthtot Rth mb 21 4 K W 2 0 KW 19 4 K W Koninklijke Philips Electronics N V 2006 All rights reserved Preliminary data sheet Rev 01 28 April 2006 13 of 19
14. imum storage temperature Tstg max If the printed circuit board has been pre heated forced cooling may be necessary immediately after soldering to keep the temperature within the permissible limit 16 3 Manual soldering Apply the soldering iron 24 V or less to the lead s of the package either below the seating plane or not more than 2 mm above it If the temperature of the soldering iron bit is less than 300 C it may remain in contact for up to 10 seconds If the bit temperature is between 300 C and 400 C contact may be up to 5 seconds 16 4 Package related soldering information Table 10 Suitability of through hole mount IC packages for dipping and wave soldering methods Package Soldering method Dipping Wave CPGA HCPGA 2 suitable DBS DIP HDIP RDBS SDIP SIL suitable suitablel PMFPE not suitable 1 For SDIP packages the longitudinal axis must be parallel to the transport direction of the printed circuit board 2 For PMFP packages hot bar soldering or manual soldering is suitable TFA9843AJ_1 Koninklijke Philips Electronics N V 2006 All rights reserved Preliminary data sheet Rev 01 28 April 2006 16 of 19 Philips Semiconductors TFA9843AJ 17 Revision history Table 11 Revision history 20 W stereo power amplifier with volume control Document ID Release date TFA9843AJ_1 20060428 Data sheet status Preliminary data sheet Change notice Supersedes TFA9843
15. ing information TFA9843AJ_1 Table 2 Ordering information Type Package number Name Description Version TFA9843AJ DBS9P plastic DIL bent SIL power package 9 leads lead length SOT523 1 12 11 mm exposed die pad Koninklijke Philips Electronics N V 2006 All rights reserved Preliminary data sheet Rev 01 28 April 2006 2 of 19 Philips Semiconductors TFA9843AJ 20 W stereo power amplifier with volume control 6 Block diagram Voc CONTROL TFA9843AJ GND Fig 1 Block diagram IN1 IN2 SHORT CIRCUIT CIV AND TEMPERATURE PROTECTION ve VOLUME 001aae428 gt OUT2 SVR 7 Pinning information 7 1 Pinning TFA9843AJ Fig 2 Pin configuration 001aae429 TFA9843AJ_1 Koninklijke Philips Electronics N V 2006 All rights reserved Preliminary data sheet Rev 01 28 April 2006 3of 19 Philips Semiconductors TFA9843AJ 7 2 20 W stereo power amplifier with volume control Pin description Table 3 Pin description Symbol Pin Description IN2 1 input 2 OUT2 2 loudspeaker terminal 2 CIV 3 common input voltage decoupling IN1 4 input 1 GND 5 ground SVR 6 half supply voltage decoupling ripple rejection VC 7 volume control input standby mute and volume control OUT1 8 loudspeaker terminal 1 Voc 9 supply voltage 8
16. lt Vive lt 1 5V 1 5Vto5 0V Volume control in this mode the volume of the amplifier can be controlled the gain can be adjusted between the range of 1 5 V lt Vivo lt 5 0 V 5 0 V to Vcc On maximum gain in this mode the amplifier has its maximum gain the Operating mode is activated at Vivc gt 5 0 V Supply voltage ripple rejection The supply voltage ripple rejection SVRR is measured with an electrolytic capacitor of 150 uF connected to pin SVR with a bandwidth of 20 Hz to 22 kHz The SVRR as a function of the frequency is illustrated in Figure 10 A larger capacitor value on pin SVR improves the ripple rejection behavior at the lower frequencies Koninklijke Philips Electronics N V 2006 All rights reserved Preliminary data sheet Rev 01 28 April 2006 5 of 19 Philips Semiconductors TFA9843AJ 20 W stereo power amplifier with volume control 8 5 Built in protection circuits The TFA9843Au contains two types of temperature sensors one measures the local temperatures of the power stages and one measures the global chip temperature At a local temperature of the power stage of approximately 185 C or a global temperature of approximately 150 C this detection circuit switches off the power stages for 2 ms When the outputs are switched off the voltage is measured on the outputs In the event of a short circuit to ground or to Vcc the device will remain in Protection mode In all other cases the power stage
17. ns 00000 eae 18 18 3 Disclaimers 000000 cee enna 18 18 4 TrademarkS 00 200 cee eeeeee 18 PHILIPS 20 W stereo power amplifier with volume control 19 Contact information 2000005 18 20 Contents o anonra tia wand ate rteaee ee 19 Please be aware that important notices concerning this document and the product s described herein have been included in section Legal information Koninklijke Philips Electronics N V 2006 All rights reserved For more information please visit http www semiconductors philips com For sales office addresses email to sales addresses www semiconductors philips com Date of release 28 April 2006 Document identifier TFA9843AJ_1
18. on malfunction of a Philips Semiconductors product can reasonably be expected to result in personal injury death or severe property or environmental damage Philips Semiconductors accepts no liability for inclusion and or use of Philips Semiconductors products in such equipment or applications and therefore such inclusion and or use is for the customer s own risk Applications Applications that are described herein for any of these products are for illustrative purposes only Philips Semiconductors makes no representation or warranty that such applications will be suitable for the specified use without further testing or modification Limiting values Stress above one or more limiting values as defined in the Absolute Maximum Ratings System of IEC 60134 may cause permanent damage to the device Limiting values are stress ratings only and operation of the device at these or any other conditions above those given in the Characteristics sections of this document is not implied Exposure to limiting values for extended periods may affect device reliability Terms and conditions of sale Philips Semiconductors products are sold subject to the general terms and conditions of commercial sale as published at http www semiconductors philips com profile terms including those pertaining to warranty intellectual property rights infringement and limitation of liability unless explicitly otherwise agreed to in writing by Philips Semiconductor
19. racks should be physically located as far as possible from the power ground tracks Supply and output tracks should be as wide as possible for delivering maximum output power AUDIO POWER CS NIJMEGEN PHILIPS i TFA9843J YAS 1467 mce506 Fig 15 Printed circuit board layout single sided components view 13 2 2 Power supply decoupling Proper supply bypassing is critical for low noise performance and high supply voltage ripple rejection The respective capacitor location should be as close as possible to the device and connected to the power ground Proper power supply decoupling also prevents unwanted oscillations For suppressing higher frequency transients spikes on the supply rail a capacitor with low ESR typical 100 nF has to be placed as close as possible to the device For suppressing lower frequency noise and ripple signals a large electrolytic capacitor e g 1000 uF or greater must be placed close to the device The bypass capacitor connected to pin SVR reduces the noise and ripple on the mid rail voltage For good THD and noise performance a low ESR capacitor is recommended Koninklijke Philips Electronics N V 2006 All rights reserved Preliminary data sheet Rev 01 28 April 2006 12 of 19 Philips Semiconductors TFA9843AJ 20 W ster
20. s In case of any inconsistency or conflict between information in this document and such terms and conditions the latter will prevail No offer to sell or license Nothing in this document may be interpreted or construed as an offer to sell products that is open for acceptance or the grant conveyance or implication of any license under any copyrights patents or other industrial or intellectual property rights 18 4 Trademarks Notice All referenced brands product names service names and trademarks are the property of their respective owners For additional information please visit http www semiconductors philips com For sales office addresses send an email to sales addresses www semiconductors philips com TFA9843AJ_1 Koninklijke Philips Electronics N V 2006 All rights reserved Preliminary data sheet Rev 01 28 April 2006 18 of 19 Philips Semiconductors TFA9843AJ 20 Contents 1 General description 02000eeee 1 2 FeatureS 0c cece eee eee eee eens 1 3 Applications 2 00 c cee eee 1 4 Quick reference data 020eeeeee 2 5 Ordering information 0006 2 6 Block diagram 00 cece eee eee 3 7 Pinning information 0 0e eens 3 7 1 PINNING ese ai x pte eee dak el ee eee a gee 3 7 2 Pin description 00 ec eee eae 4 8 Functional description 0000s 4 8 1 Input configuration 0 06 4 8 2 Po
21. s switch on automatically and the detection will take place again however a too high temperature will switch off the power stages immediately This can result in repetitive switching during too high junction temperature This protects the TFA9843AJ against short circuits to ground to the supply voltage across the load and too high chip temperatures The protection will only be activated when necessary so even during a short circuit condition a certain amount of pulsed current will still flow through the short circuit as much as the power stage can handle without exceeding the critical temperature level 9 Limiting values Table 6 Limiting values In accordance with the Absolute Maximum Rating System IEC 60134 Symbol Parameter Conditions Min Max Unit Voc supply voltage operating 0 3 28 V VI input voltage 0 3 Vcec 0 3 V loRM repetitive peak output current 4 A Tstg storage temperature non operating 55 150 C Tamb ambient temperature operating 40 85 C Prot total power dissipation 35 W Veciscp short circuit protection supply 26 V voltage 10 Thermal characteristics Table 7 Thermal characteristics Symbol Parameter Conditions Value Unit Rih a thermal resistance from in free air 40 K W junction to ambient Rih j c thermal resistance from both channels 2 0 K W junction to case driven TFA9843AJ_1 Koninklijke Philips Electronics N V 2006 All rights reserved Preliminary data sheet Rev 01
22. tive loads the output voltage can rise beyond the maximum supply voltage of 28 V At high supply voltage it is recommended to use Schottky diodes between the supply voltage and ground Koninklijke Philips Electronics N V 2006 All rights reserved Preliminary data sheet Rev 01 28 April 2006 10 of 19 Philips Semiconductors TFA9843AJ 20 W stereo power amplifier with volume control 13 1 2 Volume control drive options TFA9843AJ_1 vc 1kQ l C1 uF 001aae337 Fig 12 Volume control drive circuit with 3 3 V PWM PWM n VC 5V TE ii tL ci 10 uF 001aae338 Fig 13 Volume control drive circuit with 5 V PWM Voc 16 kQ 10 uF 001aae339 Fig 14 Volume control drive circuit with potentiometer Koninklijke Philips Electronics N V 2006 All rights reserved Preliminary data sheet Rev 01 28 April 2006 11 of 19 Philips Semiconductors TFA9843AJ TFA9843AJ_1 20 W stereo power amplifier with volume control 13 2 Printed circuit board 13 2 1 Layout and grounding To obtain a high level system performance certain grounding techniques are essential The input reference grounds have to be tied with their respective source grounds and must have separate tracks from the power ground tracks this will prevent the large output signal currents from interfering with the small AC input signals The small signal ground t
23. wer amplifier 20 000 4 8 2 1 Output power measurement 4 8 2 2 Headroom ae ccee ca ke eee eee ee ee 5 8 3 Mode selection 2 02 20005 5 8 4 Supply voltage ripple rejection 5 8 5 Built in protection circuits 6 9 Limiting values 2 0 0 0c eee eee 6 10 Thermal characteristics 0 0005 6 11 Static characteristics 0 0000 7 12 Dynamic characteristics 7 13 Application information 10 13 1 Application diagrams 10 13 1 1 Single ended application 10 13 1 2 Volume control drive options 11 13 2 Printed circuit board 12 13 2 1 Layout and grounding 12 13 2 2 Power supply decoupling 12 13 3 Thermal behavior and heatsink calculation 13 14 Test information 00 eee eee 14 14 1 Quality information 0005 14 15 Package outline 20 00eee eee 15 16 Soldering wieewceeee eee eee eee 16 16 1 Introduction to soldering through hole mount packageS gradu iaat E o i 16 16 2 Soldering by dipping or by solder wave 16 16 3 Manual soldering 0008 16 16 4 Package related soldering information 16 17 Revision history 00 cece eens 17 18 Legal information 00 00005 18 18 1 Data sheet status 0 18 18 2 Definitio
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