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Power Supply (PSU) Interface (J70, J71, and J73)
2-2
2.1 Power Supply (PSU) Interface (J70, J71, and J73)
The TAS5508−5121K8EVM module must be powered from external power
supplies. High-end audio performance requires a stabilized power supply with
low ripple voltage and low output impedance.
Note:
The length of the power supply cable must be minimized. Increasing length
of PSU cable is equal to increasing the distortion for the amplifier at high
output levels and low frequencies.
The maximum output-stage supply voltage depends of the speaker load
resistance. Check the recommended maximum supply voltage in the
TAS5121 data sheet (SLES086).
Table 2−1. Recommended Supply Voltages
Description
Voltage Limitations
(4-W load)
Current
Recommendations
System power supply 15 – 20 V 0.3 A
Output-stage power supply 0 – 30.5 V 6 A
†
†
The rated current corresponds to 2-channel full scale (80 W each), which most likely is adequate
for a standard 8-channel amplifier design.
The recommended TAS5121 power-up sequence is shown in Figure 2−1. For
proper TAS5121 operation, the RESET signal should be kept low during power
up. RESET
is pulled low during power up for 200 ms by the onboard reset
generator (U73).
Figure 2−1. Recommended Power-Up Sequence
Output stage power supply
RESET
System power supply
> 1 ms
Figure 2−2. J71 and J70 Pin Numbers
4
1
2
3
(PCB connector top view)
System Power Supply