STA323WQS datasheet(22/78 Pages) STMICROELECTRONICS

22 / 78 page

Electrical characteristics curves

STA323WQS

22/78

Electrical characteristics curves

5.1

Output power against supply voltage

Figure 14.

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

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%

4ohm

6ohm

8ohm

Power Supply Voltage (VDC)

Output power (W)

supply voltage (V)

output power (W) - BTL 1% THD

16ohm

8 ohm

6 ohm

4 ohm

STA323WQS Datasheet(PDF) 22 Page - STMicroelectronics