TDA8551_T_15 Datasheet, PDF (9/18 Pages) NXP Semiconductors – 1 W BTL audio amplifier with digital volume control

NXP Semiconductors
1 W BTL audio amplifier with digital volume
control
When a practical PCB layout is used with wider copper
tracks and some extra copper added both to the IC pin
connections and underneath the IC, the thermal resistance
from junction to ambient can be reduced. Without these
measures R_{th j-a} = 160 K/W for the SO8 package; see
Chapter “Thermal characteristics”. The power dissipation
can be calculated as follows:
P = -T----^a---^m----^b-
R_{th j-a}
For a maximum ambient temperature of 50 °C, V_P = 5 V
and R_L = 8 Ω this results in a worst case sine wave
dissipation of 0.63 W.
handbook,¹h⁰alfpage
IP
(mA)
8
6
4
Figures 5 to 15 represent test results obtained while using
the test circuit given in Fig.4. The following test conditions
apply: T_amb = 25 °C; V_P = 5 V; f = 1 kHz; R_L = 8 Ω;
2
G_v = 20 dB; audio bandwidth from 22 Hz to 22 kHz
(except for Figs 8 and 9); unless otherwise specified.
0
0
2
Product specification
TDA8551
MGM554
4 _{VP (V)} 6
Fig.5 Supply current as a function of supply
voltage.
10
handbook, halfpage
THD
(%)
1
10^−1
10^−2
10^−2
(1)
(2)
(3)
10^−1
MGM551
1 _{Po (W)} 10
(1) f = 10 kHz.
(2) f = 1 kHz.
(3) f = 100 Hz.
Fig.6 Total harmonic distortion as a function of
output power at different frequencies.
10
handbook, halfpage
THD
(%)
1
10^−1
MGM552
(1)
(2)
(3)
10^−2
10^−2
10^−1
1 _{Po (W)} 10
f = 1 kHz.
(1) G_v = 0 dB.
(2) G_v = 7 dB.
(3) G_v = 20 dB.
Fig.7 Total harmonic distortion as a function of
output power at different gains.
1998 Feb 23
9