POWER MODULE PWR207
(75W Single / Twin Subwoofer)
TABLE OF CONTENTS
Class-D Amplifier circuit description ................................................. 8-1
Exploded view + mechanical parts ................................................... 8-2
SW-out (SPK II) Boards - Circuit & Layouts ..................................... 8-3
Speaker (SPK I) Boards - Circuit diagram ........................................ 8-4
Speaker (SPK I) Boards - Component & Chips layouts ................... 8-5
Mains & ECO Stby Board - Circuit diagram ...................................... 8-6
Mains & ECO Stby Board - Component & Chip layouts ................... 8-7
Mains & ECO Stby Board - Chip layout Part A ................................. 8-8
Mains & ECO Stby Board - Chip layout Part B ................................. 8-9
Supply Board - Circuit diagram ....................................................... 8-10
Supply Board - Component & Chip layouts .................................... 8-11
Supply Board - Chip layout Part A .................................................. 8-12
Supply Board - Chip layout Part B .................................................. 8-13
Amplifier Board - Clock Generator & connector - circuit ................ 8-14
Amplifier Board - Amplifier circuit .................................................... 8-15
Amplifier Board - Bottom view ......................................................... 8-16
Amplifier Board - Top view .............................................................. 8-17
Amplifier Board - Bottom view Part A .............................................. 8-18
Amplifier Board - Bottom view Part B ............................................. 8-19
Amplifier Board - Top view Part C ................................................... 8-20
Amplifier Board - Top view Part D ................................................... 8-21
Electrical parts list - Mains, Supply, Speaker & SW-out ................. 8-22
Electrical parts list - Amplifier board ............................................... 8-23
8-1
8-1
6-channel class-D amplifier
Basic operation of a class-D amplifier
Basically, the output stage of a class-D amplifier outputs a continuous square wave swinging between positive and negative power supplies
with a fixed frequency (“clock” frequency) far beyond the audible range. The duty cycle of this square wave is modulated with the audio signal.
The output is followed by a low-pass filter which eliminates the clock frequency and allows only the audio signal going to the speaker. See
simplified drawing below.
Compared to a conventional power amplifier the benefits of the Class-D amplifier are:
• higher effiency
• lower power dissipation
• smaller heatsink required
• smaller mains transformer required
The main disadvantage of this concept is:
• The amplifier is operating with a high-frequency square wave at high amplitude and currents. This requires special precautions to prevent
excessive electromagnetic ratiation (EMC).
Summary of Contents for MX5800SA
Page 68: ...8239 210 93416 3139 113 3494pt6 dd wk0334 PART B 8 13 8 13 SUPPLY BOARD CHIP LAYOUT PART B ...
Page 76: ...3104 213 3525p5 dd wk0334 PART B 8 19 8 19 AMPLIFIER BOARD BOTTOM VIEW PART B ...
Page 78: ...3104 213 3525p5 dd wk0334 PART D 8 21 8 21 AMPLIFIER BOARD TOP VIEW PART D ...
Page 91: ...9 10 9 10 BOTTOM VIEW PART C PART C ...
Page 92: ...9 11 9 11 BOTTOM VIEW PART D PART D 3139 113 3500 pt6 dd wk334 ...
Page 95: ...9 14 9 14 BOTTOM VIEW PART G PART G ...
Page 96: ...9 15 9 15 BOTTOM VIEW PART H PART H 3139 113 3500 pt6 dd wk334 ...
Page 104: ...10 5 10 5 Exploded view 5DTC mechanic for orientation only ...
Page 111: ...BOTTOM VIEW COMPONENT LAYOUT For pcb layout 35037 11 4a 11 4a 3139 113 3503 pt 7 dd wk414 ...
Page 112: ...TOP VIEW PART A 11 5 11 5 PART A ...
Page 113: ...TOP VIEW PART B 11 6 11 6 PART B ...
Page 115: ...TOP VIEW PART B For pcb layout 35037 11 6a 11 6a 3139 113 3503 pt 7 dd wk414 PART B ...
Page 126: ...12 1 12 1 EXPLODED VIEW MAIN UNIT MX5800SA exploded view 3139 119 35170 dd wk318 ...