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2.1 Power Supply (PSU) Interface (J70)
Output-stage power supply
RESET
>1ms
System power supply
4
1
2
3
(PCB Connector Top View)
Power Supply (PSU) Interface (J70)
The TAS5504-5142V4EVM 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 the 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. Check the recommended
maximum supply voltage in the TAS5142 data sheet.
Table 2-1. Recommended Supply Voltages
VOLTAGE LIMITATIONS CURRENT
DESCRIPTION
(4- Ω LOAD) RECOMMENDATIONS
System power supply 15 V – 20 V 0.2 A
Output-stage power supply 0 V – 32 V 2 A
(1)
(1)
The rated current corresponds to two-channel full scale (30 W each), which most likely is adequate
for a standard 2.1 channel amplifier design.
The recommended TAS5142 power-up sequence is shown in Figure 2-1 . 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).
Figure 2-1. Recommended Power-Up Sequence
Figure 2-2. J70 Pin Numbers
12 System Interfaces SLEU075 – June 2006 – Revised June 2006
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