SLUAAI4 December 2021 TPSM8D6B24 , TPSM8D6C24
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In a two-phase configuration with Channel A set as the primary, the TPSM8D6C24 needs the following connections, along with their TPSM8D6C24EVM-2V0 reference designators:
To convert the TPSM8D6C24EVM-2V0 evaluation module from a dual output configuration to a dual phase configuration mimicking the TPSM8D6C24EVM-2PH make the following changes listed below. See Figure 1-1 and Figure 1-2 for visual reference.
On power up, Converter A will program Converter B's switching frequency, compensation, and output voltage, and serve as Converter B's connection to PMBus so R29, R33, R34, R35 are not required and can be removed. PMB_CLK_B, PMB_DAT_B, and PGOOD_B also do not need to be connected.
In addition, two TPSM8D6C24EVM-2V0 evaluation modules can be combined with a four board to board interconnects, in addition to common VIN and VOUT, to demonstrate a two module, four-phase design.
First, update both boards as if converting them from a dual-output to a two-phase following the steps mentioned in Section 1. See Figure 1-1, Figure 1-2 and Figure 2-1 for visual reference.
Now, update board number one with the following changes:
Update board number-two with the following changes:
Finally, connect the two boards together.
The two EVMs are now configured as a single output 4-phase converter (Figure 1-1). Thanks to the BCX_CLK and BCX_DAT connections between the four devices, the PMBus only needs to connect to EVM board one, which is placed on top to allow access to the 10-pin connector for the USB-to-GPIO adapter.
Two TPSM8D6C24EVM-2PH evaluation modules can also be converted into a four-phase single output evaluation module following a similar process as outlined in Section 2 of this application note. The TPSM8D6C24EVM-2V0 and the TPSM8D6C24EVM-2PH have the same reference designators in the same PCB locations. Components are just populated differently and both channels outputs are shorted together on the TPSM8D6C24EVM-2PH. See Figure 1-1, Figure 1-2 and Figure 2-1 for visual reference.
Update board number one with the following changes:
Update board number-two with the following changes:
Connect the two boards together.
The two EVMs are now configured as a single output 4-phase converter (Figure 1-1). Thanks to the BCX_CLK and BCX_DAT connections between the 4 devices, the PMBus only needs to connect to EVM board one, which is placed on top to allow access to the 10-pin connector for the USB-to-GPIO adapter.