DRV8718-Q1: Questions about EN_OLSC function

Hi Jeffrey,

Thanks for contacting us via this forum.

The EN_OLSC Offline Short Circuit and Open Load Detection function must be used only after disabling the drive using EN_DRV bit setting. The drive must be inactive or in other words "Offline". The over current protection function is necessary only while the device is in active drive mode in which case the EN_OLSC must be 0.

The GHx is controlled by the register control logic as shown in the datasheet - see below. Please ensure the GHx is not enabled before the device is set to active mode. Thank you.

Regards, Murugavel 

Hi Murugavel,

Thanks for your response. Let me check it with customer and close or upload it if they have additional question.

Regards,

Hi Murugavel,

There is something wrong operation that different from datasheet when HBx_CTRL is 00b. Please check the attachment and test this issue with EVM. They want to know if there is a same issue with EVM. Please check it and let me know.

Half-Bridge Control.pdf

Regards,

Hi Jeffrey,

Let me test with an EVM and get back to you.

Regards, Murugavel 

Hi Murugavel,

They are verifying their board with DRV8718 referring to your comment. During their verification, they found something wrong in the datasheet. It says that the rated voltage of ceramic capacitor between CPL2 and CPH2 is different from the datasheet below. Which one does it correct?

Regards,

Hi Jeffrey,

Please let me have the expert review this and give you a feedback. Thank you.

Regards, Murugavel 

Hi Murugavel,

I'm sorry to push you, but please check it ASAP and let me know. Thanks for your support.

Regards,

Hi Shinya,

I think that all CP1 and CP2 capacitors should be rated for PVDD+16V. Is it correct? If yes, please let me know why there is the different rated description in the datasheet between CP1 and CP2.

Regards,

Hi Shinya,

Thanks for your clear answer. I will close this case. I appreciate your support and Murugavel's support.

Regards,