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1、 DPA600 DPA1000 DPA1400 DPA2000 SERVICE MANUAL SWITCHING POWER MOSFET AMPLIFIER CH20 2 1 CH10 3 4 1 2 3 4 SIGNAL CLIP / PROT CLIP / PROT THERMAL SIGNAL 10 8 9 10 5 7 6 8 9 THERMAL 5 6 7 ON POWER RadioFans.CN 收音机爱 好者资料库 SERVICE MANUAL DPA INDEX - BLOCK DIAGRAM - FUNCTIONING DESCRIPTION - SCHEMATICS -
2、 COMPONENTS LOCATION SCHEMA - TESTING AND QUALITY CONTROL - TECHNICAL CHARACTERISTICS - WIRING DIAGRAM - CONFIGURATION 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 52-0028-0101 EP03-04-05-04 DPA600-1000-1400.doc 1 of 2 The amplifying stage basic stru
3、cture 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 than
4、 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 mosfets gate-source
5、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 current
6、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 consequence,
7、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 impedan
8、ce 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 output to
9、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 R149 and capacitor C124. The protection circuitry supervises at any time the power
10、 consumed by the MOSFETS. The circuitry basically consists on two sections: MOSFETs drain current (Id) monitoring and drain- source voltage (Vds) monitoring. When the drain current exceeds a certain limiting value, a transistor (called control-transistor) becomes conducting, together with an auxilia
11、ry circuitry (helper), formed by a transistor (which is the same type as the control-transistor) and a 82V Zener diode. This value determines the point where the auxillary circuitry starts to run. The helper-transistors base-emitter junction curve is used to obtain a non-linear variation on the MOSF
12、ETS gate-source voltage control, and thus on their drain current. author: J. Colominesdate: 050401 project: EP03/04/05-04 product: DPA600/1000/1400 ECLER approved: num: 52.0028 version: 01.01 title: FUNCTIONING DESCRIPTION 52-0028-0101 EP03-04-05-04 DPA600-1000-1400.doc 2 of 2 Moreover, as the helpe
13、r-transistors base-emitter current is temperature-dependent, the controlling circuitry (basically the control-transistor) compensates the safe operation area (SOA) drift due to temperature. If the MOSFETs drain-source voltage (Vds) drops too low, a second circuitry actuates to alter the control-tran
14、sistors triggering level, obtaining a SOA-like curve section and a current stage, which can be adjusted adequately in order to maintain the MOSFETs power consumption as close as possible to its SOA. Moreover, the amplifier also includes an ANTICLIP system. When the amplifier reaches its clipping lev
15、el, the OpAmp becomes unable to keep the system under control, and as a consequence V peaks appear at its output (15V power supply). These 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 imped
16、ance 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 contro
17、l 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 amplifier, thermal probe level comparator and a 7805-type voltage regulato
18、r. 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 circ
19、uit. 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 avoid
20、ed. 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 per
21、iod of time, a BC817-type transistor acts like a switch, connecting two 75 parallel resistors to C=47/50V. 52-0028-0100 EP03-04-05-04 DPA600-1000-1400.doc 1 of 2 The amplifying stage basic structure is actually the one commonly used until now, this is, a push-pull mounted A-B class amplifier, using
22、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 than 3. The amplifiers feedback runs through a resistor and a capacitor associated to the OpAmps non-inverting
23、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-source junction, keeping them on their conduction knee. On the other hand, they carry out the OpAmps output voltag
24、e 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 current sources output, which passes through the BF-transistors load resistors. The bias current stability against
25、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 consequence, if the temperature rises, the reference voltage decreases, thus the gate-source voltage also does, and fina
26、lly 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 impedance as constant as possible, no matter which load is connected to the stages output, or which signal frequen
27、cy 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 output to signal ground when the DC level is enough to get the diac triggered. To prevent this from happening while c
28、arrying audio signal (sine-wave, music), the diacs reference voltage is taken from a filter formed by resistor R149 and capacitor C124. The protection circuitry supervises at any time the power consumed by the MOSFETS. The circuitry basically consists on two sections: MOSFETs drain current (Id) moni
29、toring and drain- source voltage (Vds) monitoring. When the drain current exceeds a certain limiting value, a transistor (called control-transistor) becomes conducting, together with an auxiliary circuitry (helper), formed by a transistor (which is the same type as the control-transistor) and a 82V
30、Zener diode. This value determines the point where the auxillary circuitry starts to run. The helper-transistors base-emitter junction curve is used to obtain a non-linear variation on the MOSFETS gate-source voltage control, and thus on their drain current. author: J. Colominesdate: 050125 project:
31、 EP03/04/05-04 product: DPA600/1000/1400 ECLER approved: num: 52.0028 version: 01.00 title: FUNCTIONING DESCRIPTION 52-0028-0100 EP03-04-05-04 DPA600-1000-1400.doc 2 of 2 Moreover, as the helper-transistors base-emitter current is temperature-dependent, the controlling circuitry (basically the contr
32、ol-transistor) compensates the safe operation area (SOA) drift due to temperature. 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 ade
33、quately in order to maintain the MOSFETs power consumption as close as possible to its SOA. Moreover, the amplifier also includes 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 o
34、utput (15V power supply). These 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 impedance is part of a voltage divider, together with the amplifiers input impedance. So, as the optocoupler inc
35、reases its impedance, the amplifiers input signal level decreases until the system becomes stable. Also a dual-function temperature control circuitry is provided: - Temperature-depending control of the cooling fan speed, whose voltage supply is variable between 7 and 14 Vac. - Amplifier shutdown whe
36、n temperature exceeds approximately 90C. The circuitry is formed by LM35D-type IC, which acts like a thermal probe, an amplifier, 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 c
37、uts off the MOSFETs bias current by shunting a 22W resistance to the BF-type transistors load resistors. This way, the output signal 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 cut
38、ted 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 avoided. This delay is obtained by a RC-cell, where R=287K, and C=47F/50V. During start up, this RC-cells volta
39、ge 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 period of time, a BC817-type transistor acts like a switch, connecting two 75W parallel resistors to C=47/50V
40、. PARTS LIST: PRINTED CIRCUIT 11.1002.05.01 CodeDescriptionReference FCXCD4100000100nC101 FCXCD4100000100nC102 FCXCD4100000100nC103 FCXCD4100000100nC104 FCCE1000000047u/16C105 FCCE1000000047u/16C106 FCCE1000000047u/16C107 FCCE1000000047u/16C108 FCXCD4100000100nC109 FCXCD4100000100nC110 FCXCD21000001
41、00pC111 FCXCD2100000100pC112 FCXCD2100000100pC113 FCXCD2100000100pC114 FCCDH7147000C470n/275V X2C115 FCXCD122010022p 2%C116 FCXCD122010022p 2%C117 FCXCD122010022p 2%C118 FCCE1000000047u/16C119 FCXCD122010022p 2%C120 FCCDK1100000C100n/63VC121 FCCE1000000047u/16C122 FCXCD4100000100nC123 FCXCD410000010
42、0nC124 FCCDK2001000C1uC125 FCCDK2001000C1uC126 FCCE211000001000u/35C127 FCCE331525004700u/100C128 FCCE331525004700u/100C129 FCCE212200002200u/35VC130 FCCE212200002200u/35VC131 FCCE212200002200u/35VC132 FCCDK5180000C180nC133 FCCDK5180000C180nC134 FCCE331525004700u/100C135 FCCE331525004700u/100C136 FC
43、CDK5180000C180nC137 FCCDK5180000C180nC138 FCCE1000000047u/16C139 FCCE1000000047u/16C140 FCCE2504700047u/50C141 FCCE2504700047u/50C144 FCCE15470000470u/25C145 FCCI01002000Printed Board 11.1002CI101 FCXDDBAS2800BAS28D101 FCXDDBAS2800BAS28D102 FCXDDBAS2800BAS28D103 FCXDDBAS2800BAS28D104 FCREC2510000B25
44、0C1000D105 FCREC3506000FB3506D106 FCXDD40070001N4007D107 FCXDD40070001N4007D108 FCXDD40070001N4007D109 FCXDD40070001N4007D110 FCXDDBAS1600BAS16D111 FCXDDBAS1600BAS16D112 40-0131-0101 EP03-04 DPA600.xls1 of 3 PARTS LIST: PRINTED CIRCUIT 11.1002.05.01 CodeDescriptionReference FCLEDSMD3000TLMG3100D113
45、FCLEDSMD3000TLMG3100D114 FCLEDSMD2000TLMH3100D115 FCLEDSMD2500TLMY3100D116 FCLEDSMD2000TLMH3100D117 FCLEDSMD2500TLMY3100D118 FCFUS803000010A Temp.F101 FCRAD1151500HeatsinkHS100 FCRAD1263600SERA. 1137HS101 FCRAD1263600SERA. 1137HS102 FCIC55322000NE5532AIC101 FCIC55322000NE5532AIC102 FCREG79150007915I
46、C103 FCREG78150007815IC104 FCIC07201000TL072IC105 FCBASX090000YKF52-5005J101 FCBASX090000YKF52-5005J102 FCBASJ020000YKB21-5009J103 FCBASJ020000YKB21-5009J104 FCCTAMP090009P AMP MALE SOCKETJ105 FCCTAMP040004P AMP MALE SOCKETJ106 FCCTAMP040004P AMP MALE SOCKETJ107 FCTERMF63000Faston 6.3mmJ108 FCTERMF6
47、3000Faston 6.3mmJ109 FCCTM0012000B12B-EH-AJ110 FCTERM010000Jumper PinJ111 FCTERM010000Jumper PinJ112 FCTERM010000Jumper PinJ113 FCCTM0003000B3B-EH-AJ114 FCTERM010000Jumper PinJ115 FCTERM010000Jumper PinJ116 FCTERM010000Jumper PinJ117 FCCTAMP040004P AMP MALE SOCKETJ118 FCCTAMP040004P AMP MALE SOCKETJ
48、119 FCCTAMP040004P AMP MALE SOCKETJ120 FCCTM0007000B7B-EH-AJ121 FCBASS010000NL4MP FastonJ122 FCBASS010000NL4MP FastonJ123 FCBB2X3500002x1.5mHL101 FCMJ00010000JumperMJ101 FCMJ00010000JumperMJ102 FCMJ00010000JumperMJ103 FCMJ00010000JumperMJ104 FC0259300000Speak-on supportMP100 FCTUE0030000Nut M3NV101
49、FCTUE0030000Nut M3NV102 FCPORF020000Fuse clipPF101 FCPORF020000Fuse clipPF102 FCXR55100000100kR101 FCXR55100000100kR102 FCXR55100000100kR103 FCXR55100000100kR104 FCXR52100000100.0R105 FCXR52100000100.0R106 FCXR52100000100.0R107 FCXR52100000100.0R108 40-0131-0101 EP03-04 DPA600.xls2 of 3 PARTS LIST: PRINTED CIRCUIT 11.1002.05.01 CodeDescriptionReference FCXR55100000100kR109 FCXR55100000100kR110 FCXR55100000100kR111 FCXR55100000100kR112 FCXR6424300024k3 0.5%R113 FCXR64243000
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