Philips Semiconductors Application note
AN148Audio amplifier with TDA1013A
1991 Dec 3
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Figure 3. Quiescent Current vs VCC
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Figure 4. Midtap Voltage vs VCC
MEASUREMENTS
Various measurements made in the circuit of Figure 1 are given. If not
otherwise stated, the measurements are done at VCC=18V, RL=8Ω,
f=1kHz and TA=25°C.
Quiescent Current Consumption
The quiescent current as a function of VCC is given in Figure 3. At
VCC=18V the maximum spread on 20 samples is indicated by arrows.
Midtap Voltage
The midtap voltage VA versus VCC at output Pin 2 is shown in Figure
4.
Output Power and Dissipation
The output power for d=10% as a function of VCC at Pin 2 and across
the 8Ω loudspeaker load is given in Figure 5. The upper curve gives
the worst–case sinewave dissipation. The dissipation versus output
power for VCC=18V is given in Figure 6.
Distortion
The total harmonic distortion as a function of PO is shown in Figure 7
for signal frequencies of 1 and 10kHz (DC control voltage at Pin 7 is
constant 8V). In Figure 8 the same curve is given for f=1kHz but now
the output power is reduced by the DC control voltage (at d=10% VDC
Pin 7=8V). The distortion for 2.5W output power versus frequency is
given in Figure 1 1. In Figure 9, the distortion of the DC gain–controlled
preamplifier as a function of the signal excursion at Pin 6 is shown for
a DC control voltage (VDC Pin 7) of 8V. *4COL