TDA1905 STMicroelectronics, TDA1905 Datasheet - Page 10

• Manufacturer Part Number: TDA1905
• Description: IC AMP AUDIO 5.5W MONO AB 16DIP
• Manufacturer: STMicroelectronics
• Type: Class ABr

Specifications of TDA1905

• Output Type: 1-Channel (Mono)
• Max Output Power X Channels @ Load: 5.5W x 1 @ 8 Ohm
• Voltage - Supply: 4 V ~ 30 V
• Features: Depop, Mute, Thermal Protection
• Mounting Type: Through Hole
• Package / Case: 16-DIP (0.300", 7.62mm)
• Amplifier Class: AB
• No. Of Channels: 1
• Output Power: 5W
• Supply Voltage Range: 4V To 30V
• Thd + N: 0.1% @ 1.5W, 4ohm, VS=9V
• Load Impedance: 4ohm
• Operating Temperature Range: -40°C To +150°C
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-2160-5

MUTING FUNCTION
The output signal can be inhibited applying a DC voltage V
Figure 29
The input resistance at pin 5 depends on the threshold voltage V
Referring to the following input stage, the possible attenuation of the input signal and therefore of the output
Considering R
muting-on condition is typically A
muting-off condition, the attenuation is very low,
typically 1.2 dB.
A very low current is necessary to drive the thresh-
old voltage V
4 is greater than 150 K . The muting function can
be used in many cases, when a temporary inhibition
of the output signal is requested, for example:
– in switch-on condition, to avoid preamplifier
TDA1905
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power-on transients (see fig. 22)
R
R5 =
5
T
= 200 K
g
because the input resistance at pin
= 10 K
10
@
@
the attenuation in the
1.9V V
0V VT 1.3V
6V VT V
T
= 60 dB. In the
T
4.7V
s
A
where R8
– during switching at the input stages.
– during the receiver tuning.
The variable impedance capability at pin 5 can be
useful in many applications and two examples are
shown in fig. 25 and 27, where it has been used to
change the feedback network, obtaining 2 different
frequency responses.
T
T
V
V
to pin 4, as shown in fig. 29
8
i
T
muting-off
muting-on
at pin 4 and is typically :
100 K
R
g
R
R
R
8
8
R
8
8
R
R
R
5
5
5
5