U4083B Datasheet, PDF (3/11 Pages) TEMIC Semiconductors – Low-Power Audio Amplifier for Telephone Applications

U4083B
Pin 6: Supply and power dissipation
Power dissipation is shown in figures 8 to 10 for different
loads. Distortion characteristics are given in figures 11 to
13.
+ P_totmax
T_jmax – T_amb
R_thJA
where
T_jmax = Junction temperature = 140°C
T_amb = Ambient temperature
R_thJA = Thermal resistance, junction-ambient
Power dissipated within the IC in a given application is
found from the following equation:
@ @ @ P_tot = (V_S I_S) + (I_RMS V_S ) – (R_L I_RMS2)
I_S is obtained from figures 15
I_RMS is the RMS current at the load R_L.
" ^{Operating range of the integrated circuit is defined with}
a peak operating load current of 200 mA (figures 8 to
13). It is further specified with respect to different loads
in figure 14. The left (ascending) portion of each of the
three curves is defined by the power level at which 10%
distortion occurs. The center flat portion of each curve is
defined by the maximum output current capability of the
integrated circuit. The right (descending) portion of each
curve is defined by the maximum internal power dissipa-
tion of the IC at 25°C. At higher ambient temperatures,
the maximum load power must be reduced according to
the above mentioned equation.
Layout Considerations
Normally a snubber is not needed at the output of the IC,
unlike many other audio amplifiers. However, the PC
board layout, stray capacitances, and the manner in which
the speaker wires are configured, may dictate otherwise.
Generally the speaker wires should be twisted tightly, and
be not more than a few cm (or inches) in length.
Absolute Maximum Ratings
Reference point Pin 7, T_amb = 25°C unless otherwise specified.
Parameters
Supply voltage
Pin 6
Voltages
Disabled
Pins 1, 2, 3 and 4
Pins 5 and 8
Output current
Pins 5 and 8
Junction temperature
Storage temperature range
Ambient temperature range
Power dissipation: T_amb = 60°C
SO8
Symbol
Value
Unit
V_S
–1.0 to +18
V
–1.0 to (VS +1.0)
V
" –1.0 to (VS +1.0)
250
V
mA
T_j
+140
°C
T_stg
–55 to +150
°C
T_amb
–20 to +70
°C
P_tot
440
mW
Thermal Resistance
Parameters
Junction ambient
SO8
Symbol
R_thJA
Value
180
Unit
K/W
Operation Recommendation
Parameters
Supply voltage
Pin 6
Load impedance
Pins 5 to 8
Load current
Differential gain (5.0 kHz bandwidth)
Voltage @ CD Pin 1
Ambient temperature range
Symbol
Value
Unit
V_S
2 to 16
V
R_L
I_L
"8.0 to 100
200
W
mA
DG
0 to 46
dB
V_CD
VS
V
T_amb
–20 to +70
°C
TELEFUNKEN Semiconductors
3 (11)
Rev. A2, 07-Apr-97
Preliminary Information