STA323W datasheet(17/71 Pages) STMICROELECTRONICS

17 / 71 page

STA323W

Electrical characteristics curves

17/71

Electrical characteristics curves

4.1

Output power against supply voltage

Figure 13.

Stereo mode - output power against supply voltage, THD+N = 10%

Figure 13 shows the full-scale output power (0dB FS 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 STA323W and by the over-current protection limit for lower impedance

loads. The minimum threshold for the over-current protection circuit of the STA323W is 4 A

(at 25 ºC) 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 STA323W. The output power curves

assume proper thermal management of the power device's internal dissipation.

Figure 14.

Output power vs. supply for stereo bridge (THD+N=1%)

4 ohm

6 ohm

8ohm

1 0

1 2

1 4

1 6

1 8

2 0

2 2

2 4

2 6

Po w e r S u pp ly Vo lta g e (VD C )

O u tp u t p o w e r (W )

su pp ly vo lta g e (V )

ou tput p o w e r (W ) - B T L 1% T H D

2 0

16 ohm

8 o h m

6 ohm

4 o h m

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