Schaltungsbeschreibung / Circuit Desription
M 37-DC
2 - 4
GRUNDIG Service
*
100n
2206
2210
100n
2211
100n
2212
100n
2204
3300u
2213
3300u
2205
4700u
2202
4700u
2200
4700u
2214
2200u
6204
1N5392
6205
1N5392
6202
1N5392
6203
1N5392
+B1
+B2
+C
+A
1203
1205
1204
D5SBA20
6201
1008
10
11
12
13
14
15
16
17
1
2
3
4
5
6
7
8
9
10,5V
10,5V
6,5V
6,5V
4,5V
38V
18V
25V
25V
36V
pos. halfwave
neg. halfwave
Signal path
*
100n
2206
2210
100n
2211
100n
2212
100n
2204
3300u
2213
3300u
2202
4700u
2214
2200u
6204
1N5392
6205
1N5392
6202
1N5392
6203
1N5392
+B1
+B2
+A
1203
1204
D5SBA20
6201
1008
10
11
12
13
14
15
16
17
1
2
3
4
5
6
7
8
9
2205
4700u
2200
4700u
+C
1205
10,5V
10,5V
6,5V
6,5V
4,5V
38V
18V
25V
25V
36V
Signal path
pos. halfwave
neg. halfwave
17V
2205
4700u
2200
4700u
+C
1205
15
11
13
18V
6201
D5SBA20
6201
17V
Fig. 1
Fig. 2
Fig. 3
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
Fig. 4