TDA749213TR Datasheet, PDF (11/32 Pages) STMicroelectronics – 50 W + 50 W dual BTL class-D audio amplifier

TDA7492
4
Characterization curves
Characterization curves
The general test conditions used for producing the characterization curves can be
summarized as follows:
Test board: SZ LAB TDA7492 slug-up demo board
Test frequency: 1 kHz (also 100 Hz for THD vs. output power only)
Output power: 1 W
● For 6-Ω loads
– test voltage: 25 V
– LC filter: L = 22 µH and C = 220 nF
● For 8-Ω loads
– test voltage: 25 V
– LC filter: L = 33 µH and C = 220 nF
● For 4-Ω loads
– test voltage: 20 V
– LC filter: L = 15 µH and C = 470 nF.
Figure 28 on page 22 shows the circuit with which the characterization curves, shown in the
next sections, were measured. Figure 27 on page 21 shows the PCB layout.
4.1
Characterizations for 6-Ω loads
Figure 3. Output power vs. supply voltage
Test conditions:
Vcc = 15 - 25 V,
RL = 6 Ω,
Rosc = 39 kΩ, Cosc = 100 nF,
f = 1 kHz,
Gv = 30 dB,
Tamb = 25r C
Specification limit:
Typical:
Vs = 25 V, RL = 6 Ω,
Po = 50 W atTHD = 10%,
Po = 40 W atTHD = 1%
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10% THD


1% THD

          
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Doc ID 14926 Rev 5
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