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Hardware
2.2 AC-MB Power Supply
The AC-MB motherboard is powered from a single 5-V power supply. However, the motherboard has different
low-dropout regulators (LDOs) integrated that provide the required power supplies to the different blocks of
the board.
Figure 3-1
shows a block diagram depicting the power structure of the AC-MB. The AC-MB can
be powered from the host computer by using the USB 5-V power supply (VBUS) by shorting header J5, USB
POWER. Additionally, the AC-MB can be powered from an external power supply connected to terminal J4,
EXTERNAL POWER. Header J5 must be open for external supply operation. The IOVDD voltage for the digital
signals that is provided to the evaluation module is generated on the motherboard from the main power supply
(USB or external). The voltage levels available are 1.2V, 1.8V and 3.3V, and can be selected via the J3 header
IOVDD. Default setting for TAS2574EVM operation is 1.8V; 3.3V operation cannot be used for TAS2574EVM.
When the motherboard is fully powered and the power supplies from the onboard LDOs are correct, the
green POWER LED (D3) turns ON. The USB READY LED indicates that a successful USB communication is
established between the AC-MB and the host computer.
2.3 Default Jumper Setting on TAS2574EVM
Figure 4-1
given below illustrates all the default jumper settings for TAS2574EVM.
Table 4-1
shows the default positions for all the jumpers on TAS2574EVM.
6
TAS2574 Evaluation Module
Figure 2-5. Power -Supply Distribution of the AC-MB
Figure 2-6. Default Jumper Settings
Copyright © 2023 Texas Instruments Incorporated
www.ti.com
SLAU896 – JULY 2023
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