Texas Instruments TAS5508-5121K8EVM, TAS5121 manual Power Supply PSU Interface J70, J71, and J73

Power Supply (PSU) Interface (J70, J71, and J73)

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

	Voltage Limitations	Current
Description	(4-Wload)	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

System power supply

Output stage power supply

RESET

> 1 ms

Figure 2−2. J71 and J70 Pin Numbers

System Power Supply

4

3

2

1

(PCB connector top view)

2-2