Ecler-MPA4_150-pwr-sm 电路图 维修手册.pdf

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1、 MPA4-150 SERVICE MANUAL CLIP 4 0 1 2 3 SP CLIP 64 CLIPSP 6 010 9 8 7 1 2 3 9 7 10 1 82 3 CHANNEL 1 5 CHANNEL 2 5 SP 64 SP CLIP 64 2 010 9 8 7 0 1 3 10 9 8 7 CHANNEL 3 5 CHANNEL 4 5 POWER 4- 150AMP POWER AMPLIFIER MULTICHANNEL ON OFF CEEL R VOLVOLVOLVOL TH RadioFans.CN 收音机爱 好者资料库 SERVICE MANUAL MPA4

2、-150 INDEX - BLOCK DIAGRAM - SCHEMATICS - COMPONENTS LOCATION SCHEMA AND PART LIST - TESTING AND QUALITY CONTROL - TECHNICAL CHARACTERISTICS - WIRING DIAGRAM - MECHANICAL DIAGRAM - PACKING DIAGRAM RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 52-0006-0101 EP05-99 angls.doc 1 of 2 The amplifying st

3、age basic structure is actually the one commonly used until now, this is, a push-pull mounted A-B class amplifier, using P-type (IRFP9240) and N-type (IRFP240) mosfets. The systems controlling core is a NE5534 OpAmp, which is internally compensated in order to obtain an amplifying gain ratio equal o

4、r greater than 3. The amplifiers feedback runs through a resistor and a capacitor associated to the OpAmps non-inverting input. Transistors BF471 and BF472 are common-base configured, becoming actually a current source structure. They accomplish a dual function: on one hand, they polarise the mosfet

5、s gate-source junction, keeping them on their conduction knee. On the other hand, they carry out the OpAmps output voltage variations, referred to signal ground. The polarisation current adjustment is fixed by a 2k5 trimming potentiometer connected to the BF transistors base. This current is added t

6、o the current sources output, which passes through the BF-transistors load resistors. The bias current stability against temperature is fixed through the BD437 transistors. Their temperature- dependent base-emitter voltage curve is used to alter adequately the current sources reference voltage. As a

7、 consequence, if the temperature rises, the reference voltage decreases, thus the gate-source voltage also does, and finally the bias current also decreases. The Zobel network, formed by a resistor-inductor-capacitor group, and which is located at the amplifiers output, intends to keep the amplifier

8、s load impedance as constant as possible, no matter which load is connected to the stages output, or which signal frequency is to be amplified, in order to prevent an inverted-phase feedback signal. In order to avoid a DC offset on the output signal, a diac-triac tandem system is used, which shorts

9、the output to signal ground when the DC level is enough to get the diac triggered. To prevent this from happening while carrying audio signal (sine-wave, music), the diacs reference voltage is taken from a filter formed by resistor 33k2 and capacitor 1. The protection circuitry supervises at any tim

10、e the power consumed by the MOSFETS. The circuitry basically consists on two sections: MOSFETs drain current (Id) monitoring and drain- source voltage (Vds) monitoring. When Id exceeds a fixed values a control transistor in every branch starts to conduct like a switch, apliying a parallel resistor t

11、o BFs load resisitor, reduring the gate-source voltage, and also reducing Id. If the MOSFETs drain-source voltage (Vds) drops too low, a second circuitry actuates to alter the control-transistors triggering level, obtaining a SOA-like curve section and a current stage, which can be adjusted adequate

12、ly in order to maintain the MOSFETs power consumption as close as possible to its SOA. author: J. Colominesdate: 050401 project: EP05-99 product: MPA4-150 ECLER approved: num: 52.0006 version: 01.01 title: FUNCTIONING DESCRIPTION 52-0006-0101 EP05-99 angls.doc 2 of 2 Moreover, the amplifier also inc

13、ludes an ANTICLIP system. When the amplifier reaches its clipping level, the OpAmp becomes unable to keep the system under control, and as a consequence V peaks appear at its output (15V power supply). This peaks are used to be rectified and sent to an optocupler (led-resistor) which modifies its im

14、pedance as a function of those peaks amplitude. The resulting impedance is part of a voltage divider, together with the amplifiers input impedance. So, as the optocoupler increases its impedance, the amplifiers input signal level decreases until the system becomes stable. Also a dual-function temper

15、ature control circuitry is provided: - Temperature-depending control of the cooling fan speed, whose voltage supply is variable between 7 and 14 Vac. - Amplifier shutdown when temperature exceeds approximately 90C. The circuitry is formed by LM35D-type IC, which acts like a thermal probe, an amplifi

16、er, thermal probe level comparator and a 7805-type voltage regulator. The amplifier is responsible for the cooling fan speed control. The comparator triggers a relay, which cuts off the MOSFETs bias current by shunting a 22 resistance to the BF-type transistors load resistors. This way, the output s

17、ignal of the amplifier is effectively cutted off. The STAND-BY circuit. This circuit keeps the safety relay closed for about 10 seconds, thus the MOSFETs bias current is cutted off during this period, until the whole system reaches again a voltage-stable situation. Due to this, hearing annoying tran

18、sients and noises during start up through the loudspeakers is avoided. This delay is obtained by a RC-cell, where R=287K, and C=47F/50V. During start up, this RC-cells voltage smoothly rises until the 40106-type Trigger-Schmitt trigging level is reached, and the amplifier starts functioning. C=47F r

19、esets or discharges when the unit is turned off. During a short period of time, a BC817-type transistor acts like a switch, connecting two 75 parallel resistors to C=47/50V. author:Queraltdate:000719 approved: num:52.0006version:01.00 FUNCTIONING DESCRIPTION title: EP05-99 The amplifying stage basic

20、 structure is actually the one commonly used until now, this is, a push-pull mounted A-B class amplifier, using P-type (IRFP9240) and N-type (IRFP240) mosfets. The systems controlling core is a NE5534 OpAmp, which is internally compensated in order to obtain an amplifying gain ratio equal or greater

21、 than 3. The amplifiers feedback runs through a resistor and a capacitor associated to the OpAmps non- inverting input. Transistors BF871 and BF872 are common-base configured, becoming actually a current source structure. They accomplish a dual function: on one hand, they polarise the mosfets gate-s

22、ource junction, keeping them on their conduction knee. On the other hand, they carry out the OpAmps output voltage variations, referred to signal ground. The polarisation current adjustment is fixed by a 2k5 trimming potentiometer connected to the BF transistors base. This current is added to the cu

23、rrent sources output, which passes through the BF-transistors load resistors. The bias current stability against temperature is fixed through the BD437 transistors. Their temperature- dependent base emitter voltage curve is used to alter adequately the current sources reference voltage. As a consequ

24、ence, if the temperature rises, the reference voltage decreases, thus the gate-source voltage also does, and finally the bias current also decreases. The Zobel network, formed by a resistor-inductor-capacitor group, and which is located at the amplifiers output, intends to keep the amplifiers load i

25、mpedance as constant as possible, no matter which load is connected to the stages output, or which signal frequency is to be amplified, in order to prevent an inverted-phase feedback signal. In order to avoid a DC offset on the output signal, a diac-triac tandem system is used, which shorts the outp

26、ut to signal ground when the DC level is enough to get the diac triggered. To prevent this from happening while carrying audio signal (sine-wave, music), the diacs reference voltage is taken from a filter formed by resistor 33k2 and capacitor 1. The protection circuitry supervises at any time the po

27、wer consumed by the MOSFETS. The circuitry basically consists on two sections: MOSFETs drain current (Id) monitoring and drain-source voltage (Vds) monitoring. When Id exceeds a fixed values a control transistor in every branch starts to conduct like a switch, apliying a parallel resistor to BFs loa

28、d resisitor, reduring the gate-source voltage, and also reducing Id. If the MOSFETs drain-source voltage (Vds) drops too low, a second circuitry actuates to alter thecontrol-transistors triggering level, obtaining a SOA-like curve section and a current stage, which can be adjusted adequately in orde

29、r to maintain the MOSFETs power consumption as close as possible to its SOA. ECLER Sheet 1 of 2 author:Queraltdate:000719 approved: num:52.0006version:01.00 FUNCTIONING DESCRIPTION title: EP05-99 ECLER Moreover, the amplifier also includes an ANTICLIP system. When the amplifier reaches its clipping

30、level, the OpAmp becomes unable to keep the system under control, and as a consequence V peaks appear at its output (15V power supply). This peaks are used to be rectified and sent to an optocupler (led- resistor) which modifies its impedance as a function of those peaks amplitude. The resulting imp

31、edance is part of a voltage divider, together with the amplifiers input impedance. So, as the optocoupler increases its impedance, the amplifiers input signal level decreases until the system becomes stable. Also a dual-function temperature control circuitry is provided: - Temperature-depending cont

32、rol of the cooling fan speed, whose voltage supply is variable between 7 and 14 Vac. - Amplifier shutdown when temperature exceeds approximately 90C. The circuitry is formed byLM35D-type IC, which acts like a thermal probe, an amplifier, thermal probe level comparator and a 7805-type voltage regulat

33、or. The amplifier is responsible for the cooling fan speed control. The comparator triggers a relay, which cuts off the MOSFETs bias current by shunting a 22 resistance to the BF-type transistors load resistors. This way, the output signal of the amplifier is effectively cutted off. The STAND-BY cir

34、cuit. This circuit keeps the safety relay closed for about 10 seconds, thus the MOSFETs bias current is cutted off during this period, until the whole system reaches again a voltage-stable situation. Due to this, hearing annoying transients and noises during start up through the loudspeakers is avoi

35、ded. This delay is obtained by a RC-cell, where R=287K, and C=47F/50V. During start up, this RC-cells voltage smoothly rises until the 40106-type Trigger-Schmitt trigging level is reached, and the amplifier starts functioning. C=47F resets or discharges when the unit is turned off. During a short pe

36、riod of time, a BC817-type transistor acts like a switch, connecting two 75 parallel resistors to C=47/50V. Sheet 2 of 2 C10110u/50FCCE25010000 C10247u/50FCCE25047000 C10310u/50FCCE25010000 C10410u/50FCCE25010000 C105470nFCXCN4470000 C106470nFCXCN4470000 C107680pFCXCN2680000 C108UNFITTEDUNFITTED C10

37、9680pFCXCN2680000 C110UNFITTEDUNFITTED C111C100nFCCC15101000 C11222u/100FCCE35022000 C11322u/100FCCE35022000 C114C100nFCCC15101000 C115C100n/250VFCCDN1100000 C116C47n/400VFCCDH7104700 C117C1u/63VFCCDK2001000 C118100nFCXCN4100000 C119100nFCXCN4100000 C12015pFCXCN1150000 C12147u/16FCCE10000000 C12247u

38、/50FCCE25047000 C123100nFCXCN4100000 C124470nFCXCN4470000 C125470nFCXCN4470000 C126UNFITTEDUNFITTED C12710u/50FCCE25010000 C12810u/50FCCE25010000 C129470u/25FCCE15470000 C13022pFCXCN1220000 C13156pFCXCN1560000 C132100nFCXCN4100000 C13310u/50FCCE25010000 C134680pFCXCN2680000 C135470nFCXCN4470000 C136

39、C100nFCCC15101000 C13722u/100FCCE35022000 C138UNFITTEDUNFITTED C13922pFCXCN1220000 C14010u/50FCCE25010000 C141100nFCXCN4100000 C14247u/50FCCE25047000 C14356pFCXCN1560000 C14410u/50FCCE25010000 C14515pFCXCN1150000 C146470nFCXCN4470000 C147680pFCXCN2680000 C14822u/100FCCE35022000 C149C100nFCCC15101000

40、 C150UNFITTEDUNFITTED C151C1u/63VFCCDK2001000 C152C47n/400VFCCDH7104700 C153C100n/250VFCCDN1100000 C154100nFCXCN4100000 C15510u/50FCCE25010000 C156680pFCXCN2680000 C157470nFCXCN4470000 REFERENCEVALUECODE PRINTED CIRCUIT 11.0765.03.00 40-0044-0105 EP05-99.xlsSHEET 1 OF 11 REFERENCEVALUECODE PRINTED C

41、IRCUIT 11.0765.03.00 C158C100nFCCC15101000 C15922u/100FCCE35022000 C160UNFITTEDUNFITTED C16122pFCXCN1220000 C16210u/50FCCE25010000 C163100nFCXCN4100000 C16447u/50FCCE25047000 C16556pFCXCN1560000 C16610u/50FCCE25010000 C16715pFCXCN1150000 C168470nFCXCN4470000 C169680pFCXCN2680000 C17022u/100FCCE35022

42、000 C171C100nFCCC15101000 C172UNFITTEDUNFITTED C173C1u/63VFCCDK2001000 C174C47n/400VFCCDH7104700 C175C100n/250VFCCDN1100000 C176100nFCXCN4100000 C17710u/50FCCE25010000 C178680pFCXCN2680000 C179470nFCXCN4470000 C180C100nFCCC15101000 C18122u/100FCCE35022000 C182UNFITTEDUNFITTED C18322pFCXCN1220000 C18

43、410u/50FCCE25010000 C185100nFCXCN4100000 C18647u/50FCCE25047000 C18756pFCXCN1560000 C18810u/50FCCE25010000 C18915pFCXCN1150000 C190470nFCXCN4470000 C191O680pFCXCN2680000 C19222u/100FCCE35022000 C193C100nFCCC15101000 C19447u/50FCCE25047000 C195C1u/63VFCCDK2001000 C196C47n/400VFCCDH7104700 C197C100n/2

44、50VFCCDN1100000 C198100nFCXCN4100000 C199100nFCXCN4100000 C200100nFCXCN4100000 C201100nFCXCN4100000 C202100nFCXCN4100000 C203100nFCXCN4100000 CI10111.0765FCCIMPA76500 D101Z3.3VFCXZ00003300 D102Z3.3VFCXZ00003300 D103Z12VFCXZ00012000 D104BAS16FCXDDBAS1600 D106Z12VFCXZ00012000 D109DB3FCDIDB300000 D110Z

45、6.8VFCXZ00006800 D111Z7.5VFCXZ00007500 D112Z30VFCXZ00030000 D113Z30VFCXZ00030000 D114BAS16FCXDDBAS1600 40-0044-0105 EP05-99.xlsSHEET 2 OF 11 REFERENCEVALUECODE PRINTED CIRCUIT 11.0765.03.00 D115BAS28FCXDDBAS2800 D116BAS28FCXDDBAS2800 D117Z7.5VFCXZ00007500 D1181N4007FCXDD4007000 D119BAS16FCXDDBAS1600

46、 D1201N4007FCXDD4007000 D121BAS16FCXDDBAS1600 D122BAS16FCXDDBAS1600 D123BAS16FCXDDBAS1600 D124Z9.1VFCXZ00009100 D125BAS16FCXDDBAS1600 D126Z7.5VFCXZ00007500 D127BAS28FCXDDBAS2800 D128BAS28FCXDDBAS2800 D131Z3.3VFCXZ00003300 D132BAS16FCXDDBAS1600 D134Z12VFCXZ00012000 D135Z30VFCXZ00030000 D136Z3.3VFCXZ0

47、0003300 D137Z12VFCXZ00012000 D141Z6.8VFCXZ00006800 D142Z7.5VFCXZ00007500 D143DB3FCDIDB300000 D144Z30VFCXZ00030000 D145Z7.5VFCXZ00007500 D146BAS28FCXDDBAS2800 D147BAS28FCXDDBAS2800 D150Z3.3VFCXZ00003300 D151BAS16FCXDDBAS1600 D153Z12VFCXZ00012000 D154Z30VFCXZ00030000 D155Z3.3VFCXZ00003300 D156Z12VFCXZ

48、00012000 D160Z6.8VFCXZ00006800 D161Z7.5VFCXZ00007500 D162DB3FCDIDB300000 D163Z30VFCXZ00030000 D164Z7.5VFCXZ00007500 D165BAS28FCXDDBAS2800 D166BAS28FCXDDBAS2800 D169Z3.3VFCXZ00003300 D170BAS16FCXDDBAS1600 D172Z12VFCXZ00012000 D173Z30VFCXZ00030000 D174Z3.3VFCXZ00003300 D175Z12VFCXZ00012000 D179Z6.8VFC

49、XZ00006800 D180Z7.5VFCXZ00007500 D181DB3FCDIDB300000 D182Z30VFCXZ00030000 F101F4AFCFUS5020000 F102F4AFCFUS5020000 F103F4AFCFUS5020000 F104F4AFCFUS5020000 F105F4AFCFUS5020000 F106F4AFCFUS5020000 F107F4AFCFUS5020000 F108F4AFCFUS5020000 40-0044-0105 EP05-99.xlsSHEET 3 OF 11 REFERENCEVALUECODE PRINTED CIRCUIT 11.0765.03.00 HS101HEAT SINKFCRAD0200000 HS102HS PL 00.2892FP0289200000 IC101TL072FCIC07201000 IC102NE5534AFCIC55341000 IC10340106BFCIC40106000 IC104LM35DZFCIC35000000 IC105TL431ACFCIC43100000 IC1067805FCREG7805000