Arcam-P7 pwramp 电路图.pdf

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1、P7 FMJ P7 7-Channel Amplifi er Service Manual ARCAMARCAM Issue 1.0 RadioFans.CN 收音机爱 好者资料库 Contents List Section Issue Technical specifications ! Technical specification - ! Rear panel silk screen - Amplifier board L924 ! Circuit description - ! Component overlay 1.0 ! Parts list 1.1 ! Circuit diagr

2、ams 1.1 Controller board L925 ! Circuit description - ! Component overlay 1.0 ! Parts list 1.2 ! Circuit diagrams 1.2 Transformer specifications ! L911TX 1.0 ! L912TX 1.0 ! L920TX 1.0 ! L921TX 1.0 Mechanical ! General assembly parts list - ! Assembly diagrams Front panel - TX tray - - Rear panel - C

3、hassis - RadioFans.CN 收音机爱 好者资料库 Technical Specifications Contents ! Technical specifications ! Rear panel silk screen RadioFans.CN 收音机爱 好者资料库 Technical Specifications All measurements are with 230V/50Hz mains power Continuous output power All channels driven, 20Hz 20Khz, 8 ohm 150W per channel 1.05

4、kW total All channels driven, 20Hz 20kHz, 4 ohm 230W per channel 1.62kW total One or two channels driven at 1kHz, 8 ohm 160W per channel One or two channels driven at 1kHz, 4 ohm 250W per channel One or two channels driven at 1kHz, 3.2 ohm 300W per channel Peak output current capability 25A per chan

5、nel Total harmonic distortion At any level up to rated power, into 4 or 8 ohms 0.05% (20Hz 20kHz) Typically 0.005% at 1kHz Frequency response +-0.2dB (20Hz 20 kHz) -1dB at 1Hz and 100kHz Residual hum and noise Referenced to full power -122dB, 20Hz 20kHz, unweighted Voltage gain x 28.3 (1V input give

6、s 100W/8 ohm output) Input impedance 22k ohm in parallel with 470pF Output impedance 50m Ohm at 20Hz, 1kHz 120m ohm at 20kHz Power requirements 115V or 230VAC, 50/60Hz, 3kW maximum via heavy duty IEC mains inlet A soft start system eliminates large inrush currents at switch on Dimensions W430 x D450

7、 x H180 mm Weight 31kg (68 Ib) nett 35kg (77 Ib) packed 50 60 Hz 3700 VA MAX SERIAL No. LABEL CAUTION SHOCK HAZARD, DO NOT OPEN. ACHTUNG VOR OEFFNEN DES GERAETES NETZSTECKER ZIEHEN. ATTENTION RISQUE DE CHOC, NE PAS ENLEVER. PRECAUCION PELIGRO DESCARGA, NO ABRIR. RADIO INTERFERENCE (USA) THIS PRODUCT

8、 COMPLIES WITH PART 15 OF FCC RULES, OPERATION IS SUBJECT TO THE FOLLOWING CONDITIONS; (1) THIS DEVICE MAY NOT CAUSE HARMFUL INTERFERENCE (2) THIS DEVICE MUST ACCEPT ANY INTERFERENCE RECEIVED, INCLUDING INTERFERENCE THAT MAY CAUSE UNDESIRED OPERATION. THIS PRODUCT IS CERTIFIED BY THE MANUFACTURER TO

9、 COMPLY WITH DHHS RULE 21 CFR SUBPART J APPLICABLE AT THE DATE OF MANUFACTURE. DESIGNED when this current is roughly equal to the current required to drive the input signal into 44, equilibrium is reached and the closed loop gain is defined. The output stage provides the vast majority of the current

10、 required to drive the 44 signals to ground. The op-amp only provides a very small error current sufficient to give the required voltage magnification. Transistors TR204 and TR203 are wired as cascodes (common base amplifiers). Their purpose is to provide IC200 with 15V power supply rails, whilst al

11、lowing IC200s power supply pin currents to pass through them to the NPN and PNP current mirrors. The resistor, zener diode and capacitor circuits on the bases of TR204 and TR203 are to provide a controlled ramp up during power on, a stable power supply voltage and good local HF decoupling. Transisto

12、rs TR200, TR201 and TR202 form a PNP Wilson current mirror. Likewise TR205, TR207 and TR206 form an NPN Wilson current mirror. The outputs of these two current mirrors are connected together via the bias network around TR212. The two current mirrors combine to provide a very high-gain current to vol

13、tage (transresistance) gain stage, which provides all the voltage gain of the amplifier (roughly 80dB at low frequency). C205, C207, R221 and R222 provide the loop compensation for the amplifier. They combine to produce an open-loop pole at roughly 10kHz and a corresponding open-loop zero around 500

14、kHz. This allows for good time domain performance and clean square wave reproduction. The amplifier is designed to be critically damped. There should be no ringing or overshoot apparent on the output signal when a (small) step function is applied to the input. Diodes D200 and D202 act to limit the c

15、urrent through TR202 and TR206 in the event of a fault condition. When the input current exceeds 14mA the diodes conduct and the transresistance stage becomes a constant current source, killing the open loop gain and preventing damage to the transistors. Resistors R219 and R220 decouple the supplies

16、 for the amplifier gain stages from the main power rails. This is to permit the bootstrap circuit to modulate these supplies, increasing efficiency. The bootstrap will be described in more detail later. TR212 provides a 4.7V bias voltage to allow the following pre-driver stage to operate in class A.

17、 It also acts as a VBE multiplier for TR209 and TR214 to maintain an approximately constant current as the ambient temperature inside the box changes. TR209 and TR214 form a class A pre-driver emitter follower stage to boost the current gain and isolate the transresistance stage from the output tran

18、sistors. This is important to keep the loop gain of the amplifier high and thus minimise distortion. TR208 and TR213 act as a current limit (roughly 30mA) to prevent the destruction of TR209 and TR214 in a fault condition. R247, R248, R249 and R250 are to loosely decouple the emitters of TR209 and T

19、R214 from the output stage. This is very important. The output devices (Sanken power Darlingtons) have inbuilt temperature compensating diodes which control the bias voltage to their bases. Each output device has a 150 resistor so that the inbuilt diodes can accurately control quiescent VBE and henc

20、e collector current as the output power and device temperature varies. Preset potentiometer RV200 adjusts the quiescent current. NB: Ensure that the amplifier has fully warmed up before adjusting the quiescent current. D201 protects the output devices from destruction in the event of the preset pote

21、ntiometer going open circuit. PL200 allows the test engineer to measure the bias voltage (and thus collector current). C217, C218, C220 and C221 provide local HF stability around the output transistors to prevent parasitic oscillation. D204 and D205 are catch diodes to reduce the effects of induced

22、back-EMF in the loudspeaker load. R254 and C223 form part of the Zobel network that ensures the amplifier sees a constant load of roughly 4.7 at very high frequencies. This helps to improve stability and reduce HF output noise. C208 and C209 provide local high frequency decoupling for the output dev

23、ices. IC200B forms the DC integrating servo. Its purpose is to remove residual DC errors due to slight device mismatch and component tolerances. It is configured as an inverting integrator with a time constant of 0.47 seconds. Any positive DC offset at the output of the amplifier will cause the outp

24、ut of the op-amp to go negative, increasing the current in the negative supply pin and thus pulling the output down to ground (and vice versa). D203 protects the inverting input of IC200B in a fault condition. The bootstrap circuit consists of C213, C214, R241, R242, R219 and R220. The purpose of th

25、e bootstrap is to allow the output voltage swing to modulate the power supply rails of the input and voltage gain stages. This allows this circuits power supply voltage to exceed the main power rails connected to the output devices, allowing the driver stage to fully drive the output and thus give t

26、he best thermal efficiency. The bottom of R219 sees a peak-to-peak voltage swing of approximately 15 volts at full output power (i.e. it goes 7.5 volts above the rail at the peak of the cycle). The top of R220 should see the same voltage swing. Sheet 3 This sheet contains the protection circuits and

27、 interface to the microprocessor signals. TR309, TR305 and their associated components form the instantaneous load protection circuit for the output transistors. They sense the voltage across the 0.22 emitter resistors (hence emitter current) and the collector-emitter voltage, cutting off the base d

28、rive to the output transistors when the collector current or device power dissipation exceeds a preset limit. The protection circuit is designed to allow large (unrestricted) currents into loads of 3 and above but limit the current into a short circuit or very low impedance load. C318, C319, R335 an

29、d R336 form a 2.2ms time constant, which will allow larger transients of current delivery for a few milliseconds, to ensure that the amplifier has a sufficiently large transient capability to drive difficult loudspeaker loads with a music signal. TR311 also turns on when the protection circuit activ

30、ates. This switches on optocoupler IC300B causing a fault signal to be transmitted to the microcontroller. The microcontroller will then switch off the output relay to protect the amplifier. TR310, TR302 and their associated components form the DC offset detection circuit. A positive DC offset at th

31、e output will turn on TR310. A negative DC offset at the output will turn on TR302, thus causing TR313 to turn on. In either case optocoupler IC300A is switched on causing a fault signal to be transmitted to the microcontroller. The microcontroller will then switch off the output relay to protect th

32、e loudspeaker voice coils from overheating. Thermistor TH300 is connected to the positive supply rail, adjacent to the collector leg of one of the power output devices. This allows it to sense the collector temperature of the output device. Its impedance when cool is low, typically a few hundred ohm

33、s. In the event of a thermal overload (above 110C), TH300 will go to a high impedance state. This will turn on TR301, which then turns on TR300, causing optocoupler IC300D to switch on, sending a fault signal to the microcontroller. The microcontroller will then switch off the output relay until suc

34、h time as the unit has cooled down to an acceptable level (80C or so). TR301 is configured with a small amount of hysterisis (positive feedback) to ensure a clean signal is transmitted to the microprocessor via IC300D. Optocoupler IC300C is connected in series with the 3 optocouplers mentioned above

35、, producing an overall fault signal. This is so that the microcontroller can determine in which module the fault has occurred, permitting selective control of the output relay for each module in the amplifier. L924 Amplifier Module Parts List Issue 1.1 Designator PartDescription BR3003BGBU8DDiode Br

36、idge Rectifier GBU8D Plastic Package 8A 200V BR3013BGBU8DDiode Bridge Rectifier GBU8D Plastic Package 8A 200V C1032C410Capacitor SM 1206 X7R Ceramic 50V 10% 100N C1042C210Capacitor SM 1206 NPO Ceramic 50V 5% 1N0 C2002C410Capacitor SM 1206 X7R Ceramic 50V 10% 100N C2012C410Capacitor SM 1206 X7R Ceram

37、ic 50V 10% 100N C2022C410Capacitor SM 1206 X7R Ceramic 50V 10% 100N C2032N710Capacitor Radial Electrolytic Dia 5mm Pitch 5mm 100UF 25V C2042N710Capacitor Radial Electrolytic Dia 5mm Pitch 5mm 100UF 25V C2052D110W2Capacitor Boxed Polyprop 5mm Pitch 250V 5% 100P C2072D110W2Capacitor Boxed Polyprop 5mm

38、 Pitch 250V 5% 100P C2082C410ACapacitor SM 1812 X7R Ceramic 500V 10% 100N C2092C410ACapacitor SM 1812 X7R Ceramic 500V 10% 100N C2102D147WCapacitor Boxed Polyprop 5mm Pitch 100V 5% 470P C2122K447Capacitor Boxed Polyester 5mm Pitch 10% 63V 470N C2132N710BCapacitor Radial Electrolytic Dia 10mm Pitch 5

39、mm 100UF 100V C2142N710BCapacitor Radial Electrolytic Dia 10mm Pitch 5mm 100UF 100V C2152N610Capacitor Radial Electrolytic Dia 5mm Pitch 5mm 10UF 50V C2162N610Capacitor Radial Electrolytic Dia 5mm Pitch 5mm 10UF 50V C2172C047BCapacitor SM 0805 NPO Ceramic 200V 5% 47PF C2182C047BCapacitor SM 0805 NPO

40、 Ceramic 200V 5% 47PF C2202C047BCapacitor SM 0805 NPO Ceramic 200V 5% 47PF C2212C047BCapacitor SM 0805 NPO Ceramic 200V 5% 47PF C2232K347Capacitor Boxed Polyester 5mm Pitch 10% 63V 47N C2252N610Capacitor Radial Electrolytic Dia 5mm Pitch 5mm 10UF 50V C3002C410Capacitor SM 1206 X7R Ceramic 50V 10% 10

41、0N C3012N710Capacitor Radial Electrolytic Dia 5mm Pitch 5mm 100UF 25V C3052C410Capacitor SM 1206 X7R Ceramic 50V 10% 100N C3062C410Capacitor SM 1206 X7R Ceramic 50V 10% 100N C3182N710Capacitor Radial Electrolytic Dia 5mm Pitch 5mm 100UF 25V C3192N710Capacitor Radial Electrolytic Dia 5mm Pitch 5mm 10

42、0UF 25V C3202V710Capacitor Non-Polar Radial Electrolytic 100UF 16V C3212V710Capacitor Non-Polar Radial Electrolytic 100UF 16V C3222P910AMCapacitor Radial Electrolytic Dia 40mm PCB Mount 10000uF 71V C3232P910AMCapacitor Radial Electrolytic Dia 40mm PCB Mount 10000uF 71V D1013AS16WDiode Surface Mount

43、Small Signal BAS16W SOT-23 Package D2003AS16WDiode Surface Mount Small Signal BAS16W SOT-23 Package D2013AS16WDiode Surface Mount Small Signal BAS16W SOT-23 Package D2023AS16WDiode Surface Mount Small Signal BAS16W SOT-23 Package D2033AV99WDiode Dual Surface Mount Small Signal BAV99 SOT-23 Package D

44、2043B4003Diode 1N4003 DO-41 Package D2053B4003Diode 1N4003 DO-41 Package D3003AS16WDiode Surface Mount Small Signal BAS16W SOT-23 Package D3013CW315VZener Diode 0.25W Surface Mount BZX84C15V SOT-23 Package D3033AS16WDiode Surface Mount Small Signal BAS16W SOT-23 Package D3073AS16WDiode Surface Mount

45、 Small Signal BAS16W SOT-23 Package D3083CW322V D3093CW322V DZ2003CW315VZener Diode 0.25W Surface Mount BZX84C15V SOT-23 Package DZ2013CW315VZener Diode 0.25W Surface Mount BZX84C15V SOT-23 Package DZ2023CW34V7Zener Diode 0.25W Surface Mount BZX84C4V7 SOT-23 Package DZ2033CW34V7Zener Diode 0.25W Sur

46、face Mount BZX84C4V7 SOT-23 Package IC2005B072DOpamp TL072CD SO-8 Package IC3005T3Q66Opto Isolator Quad PC3Q66Q L1017D002CInductor AC 2u2 SELF BONDED PL1008K6201CON SINGLE ROW HDR 0.1IN VERTICAL 2WAY PL2008K6201CON SINGLE ROW HDR 0.1IN VERTICAL 2WAY R1031H822Resistor Metal Film 0.25W 1% 2R2 R1041A11

47、0Resistor 1206 Surface Mount 0.25W 1% 100R R2071A110Resistor 1206 Surface Mount 0.25W 1% 100R R2081A110Resistor 1206 Surface Mount 0.25W 1% 100R R2101A327Resistor 1206 Surface Mount 0.25W 1% 27K L924 Amplifier Module Parts List Issue 1.1 Designator PartDescription R2111A327Resistor 1206 Surface Moun

48、t 0.25W 1% 27K R2121A327Resistor 1206 Surface Mount 0.25W 1% 27K R2131A327Resistor 1206 Surface Mount 0.25W 1% 27K R2141A047Resistor 1206 Surface Mount 0.25W 1% 47R R2161A047Resistor 1206 Surface Mount 0.25W 1% 47R R2171A047Resistor 1206 Surface Mount 0.25W 1% 47R R2181A047Resistor 1206 Surface Moun

49、t 0.25W 1% 47R R2191H122Resistor Metal Film 0.25W 1% 220R R2201H122Resistor Metal Film 0.25W 1% 220R R2211A233Resistor 1206 Surface Mount 0.25W 1% 3K3 R2221A233Resistor 1206 Surface Mount 0.25W 1% 3K3 R2231A210Resistor 1206 Surface Mount 0.25W 1% 1K0 R2241A210Resistor 1206 Surface Mount 0.25W 1% 1K0 R2251A210Resistor 1206 Surface Mount 0.25W 1% 1K0 R2261A210Resistor 1206 Surface Mount 0