TCAN1057A-Q1: short circuit test on CANL

Amber Si

Part Number: TCAN1057A-Q1
Other Parts Discussed in Thread: ESD2CAN36-Q1

Tool/software:

Hi team

My customer use TCAN1057AVDDFRQ1 on 800V auto BMS and do short circuit test on CANL with 32V power, you can see below test setup condition:

they keep CANH floating, directly connect 32V DC power to CANL, after 30 seconds, TCAN will be burnt down, and test CANL pin impedance to GND----only 50ohm, seems short to GND

at this time, TXD waveform as below, and device is in normal mode

I'd like to know why TCAN1057AVDDFRQ1 bus can't handle 32V? but customer said TJA1051 can handle at same condition, does our device has some different application note with NXP that I need to pay attention to?

Amber

5 months ago

0 Michael Ikwuyum 5 months ago

TI__Guru 50786 points

Hi Amber,

The devices will interact differently based on the ratings of CMC and TVS diodes used. I.e., although 32 V is applied, CMC + diodes will cause transients higher than 32 V on the other side next to the device pins. Hence, transients > abs max ratings will damage the device. The recommendation would be to use the device with TVS diodes of 33 V.

See ESD2CAN36-Q1 and Common Mode Chokes in CAN Networks: Source of Unexpected Transients for more information, thanks.

Best Regards,
Michael.

0 Amber Si 5 months ago in reply to Michael Ikwuyum

TI__Intellectual 2145 points

Hi Michael，

After check with customer, they do add CMC in short circuit test, maybe it’s the cause. they do the test to offer report to their end customer.

Do we have short circuit report which pass 32V short circuit voltage and can offer to customer?

Amber

0 Michael Ikwuyum 5 months ago in reply to Amber Si

TI__Guru 50786 points

Hi Amber,

Unfortunately, short circuit report is not included in our test reports.

Please note that ESD / TVS specification based on CMC spike levels should also be considered as issue is a combination of the CMC and ESD selected, thanks.

Best Regards,

Michael.

0 Amber Si 5 months ago in reply to Michael Ikwuyum

TI__Intellectual 2145 points

Hi Michael,

it’s very strange that customer swap NXP TJA10151 SOIC package with same peripheral components, competitor can’t be burn out. Our is QFN package.
I am not sure if package will affect the test result

Amber

0 Amber Si 5 months ago in reply to Amber Si

TI__Intellectual 2145 points

Sorry typo ，our is SOT23 package now

0 Michael Ikwuyum 5 months ago in reply to Amber Si

TI__Guru 50786 points

Hi Amber,

Package should not impact result and transients observed with competitor device at the time could be well within their limits compared to those observed with our device, thanks.

Best Regards,

Michael.

0 Amber Si 5 months ago in reply to Michael Ikwuyum

TI__Intellectual 2145 points

Hi Michael,

How about if I P2P change to TCAN1051HGVDRQ1 as 1051H has 70V Vbus which is higher than 1057, not sure if it is better to pass short circuit test? regardless of its lower data rate and Vio.

Amber

0 Michael Ikwuyum 5 months ago in reply to Amber Si

TI__Guru 50786 points

Hi Amber,

Yes, 1051H is better if the transients are within the limit, thanks.

Best Regards,

Michael.

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TCAN1057A-Q1: short circuit test on CANL