Chapter 2
SLEU071 – June 2006
System Interfaces
This chapter describes the TAS5508-5142K7EVM board in regards to power supplies and system interfaces.
2.1Power Supply (PSU) Interface (J901 and J900)
The TAS5508-5142K7EVM 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 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.
Maximum output-stage supply voltage depends of the speaker load resistance. Please check the recommended maximum supply voltage in the TAS5142 data sheet.
Table 2-1. Recommended Supply Voltages
| DESCRIPTION | VOLTAGE | CURRENT RECOMMENDATIONS |
| LIMITATIONS |
| | |
| System power supply | 15 V to 20 V | 0.3 A |
| Output-stage power supply | 0 V to 32 V | 6 A(1) |
(1)The rated current correspond to 2-channel full scale (80 W each), which most likely is adequate for a standard 8-channel amplifier design.
The recommended TAS5142 power-up sequence is shown in the figure below. For proper TAS5142 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).
Systempowersupply
Outputstagepowersupply
RESET
>1ms
Figure 2-1. Recommended Power-Up Sequence
4
3
2
1
(PCBconnectortopview)
Figure 2-2. J901 and J900 Pin Numbers
SLEU071 –June 2006 | System Interfaces | 9 |
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