ta7368fg TOSHIBA Semiconductor CORPORATION, ta7368fg Datasheet - Page 2

• Manufacturer Part Number: ta7368fg
• Description: Audio Power Amplifier
• Manufacturer: TOSHIBA Semiconductor CORPORATION

Precaution For Use And Application
1. Input stage
2. Adjustment of voltage gain
3. Ripple rejection ratio
4. Power dissipation
5. Phase−compensation
The input stage of power amplifier (equivalent circuit) is comprised of a
PNP differential pair (Q
(Q
eliminated the need for an input coupling capacitor. However, in case the
brush noise of volume becomes a problem, provide serially a coupling
capacitor to the input side.
The voltage gain is fixed at G
however, its reduction is possible through adding R
In this case, the voltage gain is obtained by the following equation.
It is recommended to use this IC with the voltage gain of G
over.
Adding C
rejection ratio is improved from −25dΒ typ. to −45dΒ typ.
Care should be taken to use this IC below maximum power dissipation.
Because it may over absolute maximum rating depending on operating
condition.
Small temperature coefficient and excellent frequency characteristic is needed by capacitors below.
•
•
•
•
•
G
1
) which allows DC referencing of the source signal to ground. This
V
=
TA7368PG
TA7368FG
Oscillation preventing capacitors for power amplifier output
Bypass capacitor for ripple filter
Capacitor between V
20
RIP
l
og
, to ripple terminal 2 as shown in Figure 3, the ripple
R
5
R
+
4
R
+
4
f R
P
P
+
D
D
f R
= 900mW (Ta = 25°C)
= 400mW (Ta = 25°C)
2
and Q
CC
V
and GND
≒40dB by the resistors (R
3
) preceded by a PNP emitter follower
f
as shown in Figure 2.
2
4
and R
V
= 28dB or
5
) in IC,
C
V
1 / 4
5 / 8
RIP
in
+
RIPPLE
+
R
NF
f
IN
/
1 / 4
3 / 6
2 / 5
Q 1 Q 4
: TA7368PG / TA7368FG
90Ω
Fig.1
Fig.3
R
Q 2 Q 3
Fig.2
TA7368PG/FG
4
D1
+
−
10Ω
FROM PIN 7 / 10
R
2006-04-28
5
R
9 / 2
3 / 6
5