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