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Typical Applications
(Continued)
TL/H/7920 – 7
6, 9 No connection on LM1896
( ) Indicates pin number for LM2896
TL/H/7920 – 8
FIGURE 2. Stereo Amplifier with A
V
e
200, BW
e
30 kHz
External Components
(Figure 2)
Components
Comments
1. R2, R5, R10, R13
Sets voltage gain, A
V
e
1
a
R5/R2 for one channel and A
V
e
1
a
R10/R13
for the other channel.
2. R3, R12
Bootstrap resistor sets drive current for output stage and allows pins 3 and 12 to
go above V
S
.
3. R
o
Works with C
o
to stabilize output stage.
4. C1, C14
Input coupling capacitor. Pins 1 and 14 are at a DC potential of V
S
/2. Low
frequency pole set by:
f
L
e
1
2
q
R
IN
C1
5. C2, C13
Feedback capacitors. Ensure unity gain at DC. Also a low frequency pole at:
f
L
e
1
2
q
R2C2
6. C3, C12
Bootstrap capacitors, used to increase drive to output stage. A low frequency
pole is set by:
f
L
e
1
2
q
R3C3
7. C5, C10
Compensation capacitor. These stabilize the amplifiers and adjust their
bandwidth. See curve of bandwidth vs allowable gain.
8. C7
Improves power supply rejection (See Typical Performance Curves). Increasing
C7 increases turn-on delay.
9. C
c
Output coupling capacitor. Isolates pins 5 and 10 from the load. Low frequency
pole set by:
f
L
e
1
2
q
C
c
R
L
10. C
o
Works with R
o
to stabilize output stage.
11. C
S
Provides power supply filtering.
5
Obsolete