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Philips Semiconductors
12 W car radio power amplifier
HEATSINK DESIGN EXAMPLE
The derating of 8 K/W of the encapsulation requires the following external heatsink (for sine-wave drive):
10 W in 2
at V
14,4 V
P
maximum sine-wave dissipation: 5,2 W
T
60 C maximum
amb
R
R
R
=
+
th j-a
th j-tab
th tab-h
Since R
R
th j-tab
th tab-h
D.C. CHARACTERISTICS
Supply voltage range (pin 3)
Repetitive peak output current
Total quiescent current
at V
= 14,4 V
P
at V
= 18 V
P
A.C. CHARACTERISTICS
T
= 25 C; V
= 14,4 V; R
amb
P
Output power at d
= 10%; with bootstrap (note 1)
tot
V
= 14,4 V; R
= 2
P
L
V
= 14,4 V; R
= 4
P
L
V
= 14,4 V; R
= 8
P
L
Output power at d
= 1%; with bootstrap (note 1)
tot
V
= 14,4 V; R
= 2
P
L
V
= 14,4 V; R
= 4
P
L
V
= 14,4 V; R
= 8
P
L
Output voltage (r.m.s. value)
R
= 1 k ; d
= 0,5%
L
tot
Output power at d
= 10%; without bootstrap
tot
Voltage gain
preamplifier (note 2)
power amplifier
total amplifier
November 1982
150 60
–
R
+
=
--------------------- -
=
th h-a
5 2
8 K/W, R
17,3
th h-a
= 4 ; f = 1 kHz; unless otherwise specified; see also Fig.3
L
17,3 K/W
8
9 K/W.
V
P
I
ORM
I
tot
I
tot
P
o
P
o
P
o
P
o
P
o
P
o
V
o(rms)
P
o
G
v1
G
v2
G
v tot
5
Product specification
TDA1020
6 to 18 V
<
typ.
30 mA
typ.
40 mA
>
10 W
typ.
12 W
>
typ.
typ.
3,5 W
typ.
9,5 W
typ.
typ.
typ.
>
4,5 W
typ.
17,7 dB
16,7 to 18,7 dB
typ.
29,5 dB
28,5 to 30,5 dB
typ.
47 dB
46,2 to 48,2 dB
Preliminary Specification
4 A
6 W
7 W
6 W
3 W
5 V
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