limp home circuit

mdioud youssef

i hope if i could find someone who have some interesting documents could help me for making a good limphome system for vehicle loads

many thanks

over 6 years ago

0 LeonardEllis over 6 years ago

TI__Guru 71526 points

Hello mdioud,

I am not clear on what you are asking about. Are you referring to a "Limp-Home Mode", and if so, what specifically about "vehicle load" would this apply to? If not, please provide a high level overview of the overall system and goals.

Thank you,

~Leonard

0 LeonardEllis over 6 years ago

TI__Guru 71526 points

FYI, this App Note describes "Limp Home Mode" for BLDC motor driver: http://www.ti.com/lit/an/slva939b/slva939b.pdf .

0 mdioud youssef over 6 years ago in reply to LeonardEllis

Prodigy 90 points

i have use it to controle some bulbs/lamp for vehicle by a high side driving, the gate driver of the HSD should have the both solution -normal mode- and -fail mode(limp home),for this reason i must find a solution to add a circuit that contain the & and or logical gate and others. the problem is that i dont find much information about those type of circuit.
many thanks

0 Arun T. Vemuri over 6 years ago in reply to mdioud youssef

TI__Intellectual 800 points

Hello,

Can you let us know the know the conditions which will trigger limphome mode?

One example condition that could trigger limphome mode in BCMs is MCU failure. In this case, a watchdog is used to detect the MCU failure and then watchdog output + some logic can then be used to drive the load. See below block diagram that illustrates this concept.

See this note (http://www.ti.com/lit/an/snva837/snva837.pdfabout how watchdog output can be latched in order to drive the load.

Arun

0 mdioud youssef over 6 years ago in reply to Arun T. Vemuri

Prodigy 90 points

yeah i must do that for some loads (motors and bulbs) the problem is that i have no idea about that, it's better if u have some documents ,i need have more detail about when and how this mode must work(by details please)
many thanks

0 mdioud youssef over 6 years ago in reply to Arun T. Vemuri

Prodigy 90 points

those docs are so interresting
thank you
best regards

0 Arun T. Vemuri over 6 years ago in reply to mdioud youssef

TI__Intellectual 800 points

Thank you.

We are working on design collateral to show specific example. Please check back with us in 3Q19.

0 mdioud youssef over 6 years ago in reply to Arun T. Vemuri

Prodigy 90 points

what is this 3Q19 PLEASE?

0 FRM over 6 years ago in reply to mdioud youssef

TI__Prodigy 305 points

Hello Youssef,

this means thrid quarter 2019. Please feel free to email me directly since I am the TI representative for the company you are displaying in your registry information. I can send you further information if necessary - f-rodriguez@ti.com

Regards, Fernando

0 mdioud youssef over 6 years ago in reply to FRM

Prodigy 90 points

yeah for sur
thank you

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limp home circuit