DRV8706S-Q1EVM: Current detection function

oaku.hiroshi

Prodigy 190 points

Part Number: DRV8706S-Q1EVM

I am considering a circuit with the configuration in Figure 7-11. Please answer the following questions.

・Where is the power supply for each amplifier located?
(Example: 1st = VCP / 2nd, Reference Buffer = DVDD)

・When PVDD < VPVDD_UV, Current Sense = Disabled (Table 7-9). What happens to the SO output voltage when disabled?

over 2 years ago

0 Keerthivasan Kumanan over 2 years ago

TI__Mastermind 19585 points

Hello Hiroshi-san,

The power supply for the amplifier is from V_AREF

The SO output looks like it is HI-Z when current sense is disabled. I can double check this with more experienced members of the team.

Best regards,

Keerthi Kumanan

0 oaku.hiroshi over 2 years ago in reply to Keerthivasan Kumanan

Prodigy 190 points

Since the reference voltage is Vref/2, it is desirable to have this voltage, but am I correct in understanding that there is a high possibility that it will be Hi-Z (=0V)?
If you know the details, please contact me again.

0 Keerthivasan Kumanan over 2 years ago in reply to oaku.hiroshi

TI__Mastermind 19585 points

Hi Hiroshi-san,

In this case the voltage can really vary, and it is really dependent on the resistance attached to this node (internal and external) and the leakage current. I will double check this in the lab within the next 24 hours.

Best regards,

Keerthi Kumanan

+1 Keerthivasan Kumanan over 2 years ago in reply to Keerthivasan Kumanan

TI__Mastermind 19585 points

Hi Hiroshi-san,

I checked the SO voltage in lab when the CSA is disabled. It is close to 0 V.

Best regards,

Keerthi Kumanan

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DRV8706S-Q1EVM: Current detection function