stage .5
POWER 2001 Module
(40W Super G -Version)
11-1
11-1
TABLE OF CONTENTS
Brief Circuit Description ....................................................................11-1
Block Diagram ..................................................................................11-3
Mains Board
Component Layout .....................................................................11-4
Circuit Diagram ...........................................................................11-5
Combi Board
Component Layout
copperside
................................................11-6
Circuit Diagram
Source Selector part
.......................................11-7
Component Layout
componentside
.........................................11-8
Circuit Diagram
Amplifier part
...................................................11-9
Regulator Board
Component Layout
copperside
..............................................11-10
Circuit Diagram
Source Selector part
.....................................11-11
Component Layout
componentside
.......................................11-12
Partslist ...........................................................................................11-13
Circuit details:
Amplifier:
Attention:
In the POWER 2001 module the power amplifier IC AN7591 is used as a bridge-amplifier.
Any connection from output to ground will destroy the outpout stages!
•
Via the AMP_ON control line, connected to pins 6 (Stby), the power amplifiers are switched on/off by the µP.
High level (approx. 4,5V): power amplifiers switched on
Low level (approx. 0V): power amplifiers switched off
•
Super class G - operation
The power amplifiers operate as so-called super class G - amplifiers:
The supply pins 12 (Vcc) are not just connected to one fixed DC-supply as in conventional amplifiers.
Dependent on the output power there are three different DC-voltages supplied to the power amplifiers:
⇒
+C (+17V) for low output power
⇒
+B (+23V) for medium output power
⇒
+A (+35V) for high output power
Principle / benefit of Super Class G
Conventional power stage
Class G amplifier
Super class G amplifier
output signal
output signal
output signal
+A
+B
+C
+C
+A
+B
+C
Voltage drop on power stage IC
Voltage drop on switching transistor(s)
Benefit - voltage drop on switching transistor(s) reduces total power dissipation
activating point +A
activating point +B
activating point +A
t
Po
w
e
r
Power
dissipation
t
Po
w
e
r
Power
dissipation
t
Po
w
e
r
Power
dissipation
Output power
Benefit
Output power
%
%
%
Output power
Benefit
+C
+A
+A
+C
+A
+B
Summary of Contents for MC-21
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