Datasheet

TDA2005 Electrical specifications
Doc ID 1451 Rev 6 9/25
2.3.2 Bridge amplifier design
The following considerations can be useful when designing a bridge amplifier.
Where:
V
CE sat
= output transistors saturation voltage
V
S
= allowable supply voltage
R
L
= load impedance
Voltage and current swings are twice for a bridge amplifier in comparison with single ended
amplifier.
In other words, with the same R
L
the bridge configuration can deliver an output power that is
four times the output power of a single ended amplifier, while, with the same max output
current the bridge configuration can deliver an output power that is four times the output
power of a single ended amplifier, while, with the same max output current the bridge
configuration can deliver an output power that is twice the output power of a single ended
amplifier.
Core must be taken when selecting V
S
and R
L
in order to avoid an output peak current
above the absolute maximum rating.
From the expression for I
Omax
, assuming V
S
= 14.4 V and V
CE sat
= 2 V, the minimum load
that can be driven by TDA2005 in bridge configuration is:
The voltage gain of the bridge configuration is given by (see Figure 36):
Table 5. Bridge amplifier design
Parameter Single ended Bridge
V
o max
Peak output voltage (before clipping)
I
o max
Peak Output current (before clipping)
P
o max
RMS output power (before clipping)
1
2
---
V
s
2V
CEsat
–
V
s
2V
CEsat
–
1
2
---
V
s
2V
CEsat
–
R
L
-----------------------------------
V
s
2V
CEsat
–
R
L
-----------------------------------
1
4
---
V
s
2V
CEsat
–
2
2R
L
-------------------------------------------
V
s
2V
CEsat
–
2
2R
L
-------------------------------------------
R
Lmin
V
s
2V
CEsat
–
I
Omax
----------------------------------- -
14.4 4–
3.5
-------------------- - 2.97===
G
v
V
0
V
1
------ - 1
R
1
R
2
R
4

R
2
R
4
+
---------------------



--------------------------
R
3
R
4
-------++==