TCAN1043H-Q1: When the CANH or CANL short to the 48V battery Voltage, How to design with TCAN1043H-Q1?

Danilo A.

Hi Team,

Posting on behalf of our customer.

If CANH or CANL is short-circuited to the 48V (Maxmum 60V)power supply, although the chip can withstand a voltage of 70V without being damaged. However, designing the components of the chip's peripheral circuits is a significant challenge.

So, how to determine the power withstand voltage value of the TVS and the power of the terminal resistor? If a short circuit does occur.

Another question is, if there is a prolonged short circuit with 60V, will it damage the chips and peripheral circuit components? What are some good ways to avoid it?

Regards,

Danilo

3 months ago

0 Michael Ikwuyum 3 months ago

TI__Guru 61887 points

Hi Danilo,

If I understand correctly, you are asking about the absolute max conditions for components other than the TCAN device.

If so, I would recommend referring to their respective data sheets or supporting teams.

As a general rule of thumb, please see this Wattage Requirements Thread for the termination resistor.
For the TVS, choose one with a standoff ≥ the worst case system voltage expected (60 V for this case) and clamping ≤ the TCAN abs max of 70 V, thanks.

Best Regards,

Michael.

0 Chaofei Hou 3 months ago in reply to Michael Ikwuyum

Prodigy 10 points

Thanks a lot !
1. Could you please provide the TCAN1043H-Q1 70V@40ms short current reports?
2. Could you please help us conduct a test on the long-term short-circuit 60V power supply for CANH and CANL based on the chip TCAN1043H-Q1? And please provide us with the corresponding test data as well.

0 Michael Ikwuyum 3 months ago in reply to Chaofei Hou

TI__Guru 61887 points

Hi Chaofei,

1. Unfortunately, there isn't a short current report. Please see below for all available reports:

CAN transceiver EMC and other compliance reports
- Note: this is an internal resource only. For assistance with documentation, reach out to TI customer service, TI FAE, or TI sales representative.

2. Unfortunately we would not be meaningfully able to as this is very dependent on the system environment I.e., results will be different and would recommend verifying per your system environment, thanks.

Best Regards,

Michael.

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TCAN1043H-Q1: When the CANH or CANL short to the 48V battery Voltage, How to design with TCAN1043H-Q1?