Texas Instruments TPA3251, Руководство пользователя

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Hardware Configuration
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14 SLAU751 – November 2017
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TPA3251 Evaluation Module
3.9 Reset Circuit
The TPA3251EVM includes RESET supervision so that the TPA3251 device remains in reset until all the
power rails are up and stable. The RESET supervisor also ensures that the device is put into reset if one
of the power rails experiences a brownout. This circuit combined with the RESET switch (S1) help ensure
that the TPA3251 can be placed in reset easily as needed or automatically if there is a power supply
issue.
3.10 Op Amp versus Direct Drive
The op amps are used to change a single-ended input into a differential input. By default, the gain of the
op amps are set for unity gain; however, this can be modified to increase or decrease the gain through the
op amps. One way to bypass the op amps for a more direct connection is using the AIB.
4 EVM Design Documents
This section contains the TPA3251EVM board layout, schematics, and bill of materials (BOM).
4.1 TPA3251EVM Board Layouts
Figure 25 and Figure 26 illustrate the EVM board layouts.
Figure 25. TPA3251 EVM Top Composite Assembly