EUA6205 Datasheet, PDF (10/13 Pages) Eutech Microelectronics Inc – 1.25-W Mono Fully Differential Audio Power Amplifier with 1.8V Input Logic Thresholds

EUA6205
Application Information
Application Schematics
Figure23 through Figure26 show application schematics
for differential and single-ended inputs. Typical values
are shown in Table1.
Table1. Typical Component Value
Component
R_I
R_F
C_(BYPASS)
C_S
C_I
Value
10kΩ
10kΩ
0.22µF
1µF
0.22µF
Figure 25. Application Schematic With Summing Two
Differential Inputs
Figure 23. Differential Input Application Schematic
Optimized With Input Capacitors
Figure 26. Application Schematic With Summing Two
Single-Ended Inputs
Power Dissipation
Power dissipation is a major concern when designing a
successful amplifier, whether the amplifier is bridged or
single-ended. A direct consequence of the increased
power delivered to the load by a bridge amplifier is an
increase in internal power dissipation. Since the
EUA6205 has two operational amplifiers in one package,
the maximum internal power dissipation is 4 times that of
a single-ended amplifier. The maximum power dissipation
for a given application can be derived from the power
dissipation graphs of from equation1.
P_DMAX = 4 * (V_DD )² /(2π ²R _L ) --------------------(1)
Figure 24. Single-Ended Input Application Schematic
DS6205 Ver 1.0 Mar. 2007
It is critical that the maximum junction temperature T_JMAX
of 150°C is not exceeded. T_JMAX can be determine from
the power derating curves by using P_DMAX and the PC
board foil area. By adding additional copper foil, the
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