Onkyo-HTP420-ss-sm维修电路原理图.pdf

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1、HTP-420 SERVICE MANUALSERVICE MANUAL 5.1-CH HOME THEATER SPEAKER PACKAGE Black and Silver models MODEL HTP-420(B)/(S) Ref. No. 3808 042004 120V AC, 60Hz 120V AC, 60Hz - 230-240V AC, 50Hz - - BMDD BMDC - BMPA - - 120V AC, 60Hz 120V AC, 60Hz 120V AC, 60Hz 230-240V AC, 50Hz 220-230V AC, 50/60Hz 230-240

2、V AC, 50Hz SMDD SMDC SMDT SMPA SMGT SMPT Front Speakers (L / R) SKF-420F Center Speaker SKC-420C Surround Speakers (L / R) SKM-420S Powered Subwoofer SKW-420 SAFETY-RELATED COMPONENT WARNING! COMPONENTS IDENTIFIED BY MARK ON THE SCHEMATIC DIAGRAM AND IN THE PARTS LIST ARE CRITICAL FOR RISK OF FIRE A

3、ND ELECTRIC SHOCK. REPLACE THESE COMPONENTS WITH ONKYO PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL. MAKE LEAKAGE-CURRENT OR RESISTANCE MEASUREMENTS TO DETERMINE THAT EXPOSED PARTS ARE ACCEPTABLY INSULATED FROM THE SUPPLY CIRCUIT BEFORE RETURNING THE APPLIANCE TO THE CUSTOMER. RadioFans.C

4、N 收音机爱 好者资料库 SPECIFICATIONS HTP-420 Type : Input sensitivity/impedance : Maximum output power : Frequency response : Cabinet capacity : Dimensions (W x H x D) : Weight : Driver unit : Power supply : America : Others : Power consumption : America : Australia : Others : Other : Bass-reflex with built-

5、in power amplifier 220 mV / 15 k ohm 150 W (Dynamic Power) 30 Hz - 150 Hz 1.15 cubic feet (32.5 L) 9-1/4 x 20-3/8 x 16-3/16 (235 x 518 x 411 mm) 28.2 lbs. (12.8 kg) 8 inch Cone Woofer AC 120 V, 60 Hz AC 230-240 V, 50 Hz AC 220-230 V, 50/60 Hz 75 W 77 W 77 W Auto Standby function Front Speaker (SKF-4

6、20F) Type : Impedance : Maximum input power : Output sound pressure level : Frequency response : Crossover frequency : Cabinet capacity : Dimensions (W x H x D) : Weight : Drivers unit : Terminal : Other : 2-way Bass-reflex 8 ohm 100 W 84 dB/W/m 60 Hz - 50 kHz 5 kHz 0.2 cubic feet (5.6L) 4-7/8 x 18-

7、5/16 x 7-1/16 (124 x 465 x 179 mm) 7.5 lbs. (3.4 kg) 4 inch Cone Woofer x 2 1 inch Balanced Dome tweeter Color-coded push type Magnetic shielding Type : Impedance : Maximum input power : Output sound pressure level : Frequency response : Crossover frequency : Cabinet capacity : Dimensions (W x H x D

8、) : Weight : Drivers unit : Terminal : Other : 2 Way Bass-reflex 8 ohm 100 W 84 dB/W/m 60 Hz - 50 kHz 5 kHz 0.2 cubic feet (5.6 L) 17-1/8 x 5-1/8 x 7-1/16 (435 x 130 x 179 mm) 7.5 lbs. (3.4 kg) 4 inch Cone Woofer x 2 1 inch Balanced Dome tweeter Color-coded push type Magnetic shielding Surround Spea

9、ker (SKM-420S) Type : Impedance : Maximum input power : Output sound pressure level : Frequency response : Crossover frequency : Cabinet capacity : Dimensions (W x H x D) : Weight : Drivers unit : Terminal : 2-way Bass-reflex 8 ohm 100 W 82 dB/W/m 60 Hz - 50 kHz 5 kHz 0.08 cubic feet (2.3 L) 5-13/16

10、 x 11 x 4-7/8 (147 x 280 x 124 mm) 3.7 lbs. (1.7 kg) 4 inch Cone Woofer 1 inch Balanced Dome tweeter Color-coded push type Specifications and appearance are subject to change without prior notice. Powered Subwoofer (SKW-420)Center Speaker (SKC-420C) RadioFans.CN 收音机爱 好者资料库 HTP-420 EXPLODED VIEWS-1 S

11、KW-420 : POWERED SUBWOOFER HTP-420 A02 SP06 x 10 pcs. A05 x 4 pcs. A04 F903 A03 U02 U03 F902 A01 U01 A06 IC501- Refer to PRINTED CIRCUIT BOARD PARTS LIST Refer to EXPLODED VIEWS-2 MDD type MDC type MDT type MPA type MGT type MPT type A06 (POWER SWITCH) : MDD type MDC type MDT type MPA type MGT type

12、MPT type - No - No - No - Yes - Yes - Yes HTP-420 EXPLODED VIEWS-2 SKW-420 : POWERED SUBWOOFER HTP-420 SP06 x 8 pcs. SP08 SP04 SP01 SP03 SP05 x 8 pcs. SP02 x 4 pcs. HTP-420 EXPLODED VIEWS-3 SKF-420F / SKC-420C / SKM-420S HTP-420 SP11SP13 SP10SP12 SP17SP19 SP16SP18 SP14 SP15 SKF-420F (L)SKF-420F (R)

13、SKC-420C SKM-420S (R)SKM-420S (L) TERMINAL : White / Black TERMINAL : Red / Black TERMINAL : Green / Black TERMINAL : Blue / Black TERMINAL : Gray / Black HTP-420 BLOCK DIAGRAM SKW-420 : POWERED SUBWOOFER HTP-420 HTP-420 SCHEMATIC DIAGRAM SKW-420 : POWERED SUBWOOFER HTP-420 A 1 2 3 4 5 BCDEFGH LINE

14、INPUT OUTPUT LEVEL AC 120V / 60Hz AC 220-230V / 50Hz AC 230-240V / 50Hz SPEAKER INPUT PC BOARDU02MAIN PC BOARDU01VR / LED PC BOARDU03 LED RED : STANDBY GREEN : ON POWER SWITCH* / C1* MDD type MDC type MDT type MPA type MGT type MPT type - No - No - No - Yes - Yes - Yes * * * * C913* / C914* MDD type

15、 MDC type MDT type MPA type MGT type MPT type - Yes - Yes - Yes - No - No - No HTP-420 SCHEMATIC DIAGRAM SKW-420 : POWERED SUBWOOFER HTP-420 A 1 2 3 4 5 BCDEFGH LINE INPUT OUTPUT LEVEL AC 120V / 60Hz AC 220-230V / 50Hz AC 230-240V / 50Hz SPEAKER INPUT PC BOARDU02MAIN PC BOARDU01VR / LED PC BOARDU03

16、LED RED : STANDBY GREEN : ON POWER SWITCH* / C1* MDD type MDC type MDT type MPA type MGT type MPT type - No - No - No - Yes - Yes - Yes * * * * C913* / C914* MDD type MDC type MDT type MPA type MGT type MPT type - Yes - Yes - Yes - No - No - No HTP-420 SCHEMATIC DIAGRAM SKW-420 : POWERED SUBWOOFER A

17、 1 2 3 4 5 BCDEFGH LINE INPUT OUTPUT LEVEL AC 120V / 60Hz AC 220-230V / 50Hz AC 230-240V / 50Hz SPEAKER INPUT PC BOARDU02MAIN PC BOARDU01VR / LED PC BOARDU03 LED RED : STANDBY GREEN : ON POWER SWITCH* / C1* MDD type MDC type MDT type MPA type MGT type MPT type - No - No - No - Yes - Yes - Yes * * *

18、* C913* / C914* MDD type MDC type MDT type MPA type MGT type MPT type - Yes - Yes - Yes - No - No - No HTP-420 PC BOARD CONNECTION DIAGRAM SKW-420 : POWERED SUBWOOFER HTP-420 MAIN PC BOARD VR / LED PC BOARD INPUT PC BOARD POWER SWITCH : MDD type MDC type MDT type MPA type MGT type MPT type - No - No

19、 - No - Yes - Yes - Yes POWER SWITCH HTP-420 PRINTED CIRCUIT BOARD VIEW SKW-420 : POWERED SUBWOOFER A 1 2 3 4 5 BCD INPUT PC BOARDU02 MAIN PC BOARDU01 VR / LED PC BOARDU03 No PC board view Look over the actual PC board on hand TDA7293 120V - 100W DMOS AUDIO AMPLIFIER WITH MUTE/ST-BY VERY HIGH OPERAT

20、ING VOLTAGE RANGE (50V) DMOS POWER STAGE HIGH OUTPUT POWER (100W THD = 10%, RL = 8, VS = 40V) MUTING/STAND-BY FUNCTIONS NO SWITCH ON/OFF NOISE VERY LOW DISTORTION VERY LOW NOISE SHORT CIRCUIT PROTECTED (WITH NO IN- PUT SIGNAL APPLIED) THERMAL SHUTDOWN CLIP DETECTOR MODULARITY (MORE DEVICES CAN BE EA

21、SILY CONNECTED IN PARALLEL TO DRIVE VERY LOW IMPEDANCES) DESCRIPTION The TDA7293 is a monolithic integrated circuit in Multiwatt15 package, intended for use as audio class AB amplifier in Hi-Fi field applications (Home Stereo, self powered loudspeakers, Top- class TV). Thanks to the wide voltage ran

22、ge and to the high out current capability it is able to sup- ply the highest power into both 4 and 8 loads. The built in muting function with turn on delay simplifies the remote operation avoiding switching on-off noises. Parallel mode is made possible by connecting more device through of pin11. Hig

23、h output power can be delivered to very low impedance loads, so optimizing the thermal dissipation of the system. January 2003 IN-2 R2 680 C2 22F C1 470nF IN+ R1 22K 3 R3 22K - + MUTE STBY 4 VMUTE VSTBY 10 9 SGND MUTE STBY R4 22K THERMAL SHUTDOWN S/C PROTECTION R5 10K C3 10FC4 10F 1 STBY-GND C5 22F

24、713 14 6 158 -Vs-PWVs BOOTSTRAP OUT +PWVs+Vs C9 100nFC8 1000F -Vs D97AU805A +Vs C7 100nFC6 1000F BUFFER DRIVER 11 BOOT LOADER 12 5 VCLIP CLIP DET (*) (*) see Application note (*) for SLAVE function (*) Figure 1: Typical Application and Test Circuit Multiwatt15V Multiwatt15H ORDERING NUMBERS: TDA7293

25、V TDA7293HS MULTIPOWER BCD TECHNOLOGY 1/15 ABSOLUTE MAXIMUM RATINGS SymbolParameterValueUnit VSSupply Voltage (No Signal)60V V1VSTAND-BY GND Voltage Referred to -VS (pin 8)90V V2Input Voltage (inverting) Referred to -VS 90V V2 - V3Maximum Differential Inputs30V V3Input Voltage (non inverting) Referr

26、ed to -VS 90V V4Signal GND Voltage Referred to -VS 90V V5Clip Detector Voltage Referred to -VS 120V V6Bootstrap Voltage Referred to -VS 120V V9Stand-by Voltage Referred to -VS 120V V10Mute Voltage Referred to -VS 120V V11Buffer Voltage Referred to -VS 120V V12Bootstrap Loader Voltage Referred to -VS

27、 100V IOOutput Peak Current10A PtotPower Dissipation Tcase = 70C50W TopOperating Ambient Temperature Range0 to 70C Tstg, TjStorage and Junction Temperature150C 1 2 3 4 5 6 7 9 10 11 8 BUFFER DRIVER MUTE STAND-BY -VS (SIGNAL) +VS (SIGNAL) BOOTSTRAP CLIP AND SHORT CIRCUIT DETECTOR SIGNAL GROUND NON IN

28、VERTING INPUT INVERTING INPUT STAND-BY GND TAB CONNECTED TO PIN 8 13 14 15 12 -VS (POWER) OUT +VS (POWER) BOOTSTRAP LOADER D97AU806 PIN CONNECTION (Top view) THERMAL DATA SymbolDescriptionTypMaxUnit Rth j-caseThermal Resistance Junction-case11.5C/W TDA7293 2/15 ELECTRICAL CHARACTERISTICS (Refer to t

29、he Test Circuit VS = 40V, RL = 8, Rg = 50 ; Tamb = 25C, f = 1 kHz; unless otherwise specified). SymbolParameterTest ConditionMin.Typ.Max.Unit VSSupply Range1250V IqQuiescent Current50100mA IbInput Bias Current0.31A VOSInput Offset Voltage-1010mV IOSInput Offset Current0.2A PORMS Continuous Output Po

30、werd = 1%: RL = 4; VS = 29V, 7580 80 W d = 10% RL = 4 ; VS = 29V 90100 100 W dTotal Harmonic Distortion (*)PO = 5W; f = 1kHz PO = 0.1 to 50W; f = 20Hz to 15kHz 0.005 0.1 % % ISCCurrent Limiter ThresholdVS 40V6.5A SRSlew Rate510V/s GVOpen Loop Voltage Gain80dB GVClosed Loop Voltage Gain (1)293031dB e

31、NTotal Input NoiseA = curve f = 20Hz to 20kHz 1 310 V V RiInput Resistance 100k SVRSupply Voltage Rejectionf = 100Hz; Vripple = 0.5Vrms75dB TSThermal ProtectionDEVICE MUTED150C DEVICE SHUT DOWN160C STAND-BY FUNCTION (Ref: to pin 1) VST onStand-by on Threshold1.5V VST offStand-by off Threshold3.5V AT

32、Tst-byStand-by Attenuation7090dB Iq st-byQuiescent Current Stand-by0.51mA MUTE FUNCTION (Ref: to pin 1) VMonMute on Threshold1.5V VMoffMute off Threshold3.5V ATTmuteMute AttenuatIon6080dB CLIP DETECTOR DutyDuty Cycle ( pin 5)THD = 1% ; RL = 10K to 5V10% THD = 10% ; RL = 10K to 5V 304050% ICLEAKPO =

33、50W3A SLAVE FUNCTION pin 4 (Ref: to pin 8 -VS) VSlaveSlaveThreshold1V VMasterMaster Threshold3V Note (1): GVmin 26dB Note: Pin 11 only for modular connection. Max external load 1M/10 pF, only for test purpose Note (*): Tested with optimized Application Board (see fig. 2) TDA7293 3/15 Figure 2: Typic

34、al Application P.C. Board and Component Layout (scale 1:1) TDA7293 4/15 APPLICATION SUGGESTIONS (see Test and Application Circuits of the Fig. 1) The recommended values of the external components are those shown on the application circuit of Fig- ure 1. Different values can be used; the following ta

35、ble can help the designer. COMPONENTSSUGGESTED VALUEPURPOSE LARGER THAN SUGGESTED SMALLER THAN SUGGESTED R1 (*)22kINPUT RESISTANCEINCREASE INPUT IMPEDANCE DECREASE INPUT IMPEDANCE R2680CLOSED LOOP GAIN SET TO 30dB (*) DECREASE OF GAININCREASE OF GAIN R3 (*)22kINCREASE OF GAINDECREASE OF GAIN R422kST

36、-BY TIME CONSTANT LARGER ST-BY ON/OFF TIME SMALLER ST-BY ON/OFF TIME; POP NOISE R510kMUTE TIME CONSTANT LARGER MUTE ON/OFF TIME SMALLER MUTE ON/OFF TIME C10.47FINPUT DC DECOUPLING HIGHER LOW FREQUENCY CUTOFF C222FFEEDBACK DC DECOUPLING HIGHER LOW FREQUENCY CUTOFF C310FMUTE TIME CONSTANT LARGER MUTE

37、ON/OFF TIME SMALLER MUTE ON/OFF TIME C410FST-BY TIME CONSTANT LARGER ST-BY ON/OFF TIME SMALLER ST-BY ON/OFF TIME; POP NOISE C522FXN (*)BOOTSTRAPPINGSIGNAL DEGRADATION AT LOW FREQUENCY C6, C81000FSUPPLY VOLTAGE BYPASS C7, C90.1FSUPPLY VOLTAGE BYPASS DANGER OF OSCILLATION (*) R1 = R3 for pop optimizat

38、ion (*) Closed Loop Gain has to be 26dB (*) Multiplay this value for the number of modular part connected MASTER UNDEFINED SLAVE -VS +3V -VS +1V -VS D98AU821 Slave function: pin 4 (Ref to pin 8 -VS) Note: If in the application, the speakers are connected via long wires, it is a good rule to add betw

39、een the output and GND, a Boucherot Cell, in order to avoid dangerous spurious oscillations when the speakers terminal are shorted. The suggested Boucherot Resistor is 3.9/2W and the capacitor is 1F. TDA7293 5/15 INTRODUCTION In consumer electronics, an increasing demand has arisen for very high pow

40、er monolithic audio amplifiers able to match, with a low cost, the per- formance obtained from the best discrete de- signs. The task of realizing this linear integrated circuit in conventional bipolar technology is made ex- tremely difficult by the occurence of 2nd break- down phoenomenon. It limits

41、 the safe operating area (SOA) of the power devices, and, as a con- sequence, the maximum attainable output power, especially in presence of highly reactive loads. Moreover, full exploitation of the SOA translates into a substantial increase in circuit and layout complexity due to the need of sophis

42、ticated pro- tection circuits. To overcome these substantial drawbacks, the use of power MOS devices, which are immune from secondary breakdown is highly desirable. The device described has therefore been devel- oped in a mixed bipolar-MOS high voltage tech- nology called BCDII 100/120. 1) Output St

43、age The main design task in developping a power op- erational amplifier, independently of the technol- ogy used, is that of realization of the output stage. The solution shown as a principle shematic by Fig3 represents the DMOS unity - gain output buffer of the TDA7293. This large-signal, high-power

44、 buffer must be ca- pable of handling extremely high current and volt- age levels while maintaining acceptably low har- monic distortion and good behaviour over frequency response; moreover, an accurate con- trol of quiescent current is required. A local linearizing feedback, provided by differen- t

45、ial amplifier A, is used to fullfil the above require- ments, allowing a simple and effective quiescent current setting. Proper biasing of the power output transistors alone is however not enough to guarantee the ab- sence of crossover distortion. While a linearization of the DC transfer charac- ter

46、istic of the stage is obtained, the dynamic be- haviour of the system must be taken into account. A significant aid in keeping the distortion contrib- uted by the final stage as low as possible is pro- vided by the compensation scheme, which ex- ploits the direct connection of the Miller capacitor a

47、t the amplifiers output to introduce a local AC feedback path enclosing the output stage itself. 2) Protections In designing a power IC, particular attention must be reserved to the circuits devoted to protection of the device from short circuit or overload condi- tions. Due to the absence of the 2n

48、d breakdown phe- nomenon, the SOA of the power DMOS transis- tors is delimited only by a maximum dissipation curve dependent on the duration of the applied stimulus. In order to fully exploit the capabilities of the power transistors, the protection scheme imple- mented in this device combines a con

49、ventional SOA protection circuit with a novel local tempera- ture sensing technique which dynamically con- trols the maximum dissipation. Figure 3: Principle Schematic of a DMOS unity-gain buffer. TDA7293 6/15 In addition to the overload protection described above, the device features a thermal shutdown circuit which initially puts the