STA323WQS Datasheet, PDF (22/78 Pages) STMicroelectronics – 2.1-channel high-efficiency digital audio system with QSound QHD®

Electrical characteristics curves
5
Electrical characteristics curves
STA323WQS
5.1
Output power against supply voltage
Figure 14. Stereo mode - output power vs. supply voltage, THD+N = 10%
Output power (W)
80
70
60
50
4ohm
6ohm
8ohm
40
30
20
10
10 12 14 16 18 20 22 24 26
Power Supply Voltage (VDC)
Figure 14 shows the full-scale output power (0 dBFS digital input with unity amplifier gain)
as a function of power supply voltage for 4, 6, and 8 Ω loads in either DDX^® mode or binary
full bridge mode. Output power is constrained for higher impedance loads by the maximum
voltage limit of the STA323WQS and by the over-current protection limit for lower impedance
loads. The minimum threshold for the over-current protection circuit of the STA323WQS is
4 A (at 25° C) but the typical threshold is 6 A for the device. The solid curves shows the
typical output power capability of the device. The dotted curves shows the output power
capability constrained to the minimum current specification of the STA323WQS. The output
power curves assume proper thermal management of the power device's internal
dissipation.
Figure 15. Output power vs. supply for stereo bridge, THD+N=1%
output power (W) - BTL 1% THD
60
50
4 ohm
6 ohm
40
8 ohm
30
16ohm
20
10
0
10
15
20
25
30
supply voltage (V)
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