• State
  • Locked Locked
  • Replies 2 replies
  • Subscribers 62 subscribers
  • Views 508 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPS54202: TPS54202

Agarb Carvalho
Prodigy 50 points
Part Number: TPS54202
Other Parts Discussed in Thread: LM46002

I'm willing to use TPS54202 DC/DC 28V converter for a car tracking system (4.4V/2A), based on Gemalto GPRS modem device and uBlox Max-7 GPS.

Low EMI, small external components and small area are the main reasons.

Is it a problem to limit Vin in 28V for truck application? or should I use a higher input voltage device is end product is to be used also in trucks?

Does anyone knows a similar device with higher Vin input?

I like the idea not to use an external diode. 

thks

  • 0
    TI__Expert 4365 points
    You might start with the Application Note SNVA717 which discusses many of the issues encountered in the automotive space. This application was developed for the common 12V battery system of typical vehicles, not the 24/28V system used in commercial and heavy vehicles. Most of that application can scale but the gate clamp of the input P-channel MOSFET will conduct to protect the 20V rated max gate so that part of the application will always draw some current. In the 12V environment the application draws only leakage currents. There are other TI Ap Notes on this subject from other engineers.

    Getting to your question about Vin max rating, You need to determine if your application needs to operate during a load dump event. If it does not, then disconnecting the switching regulator during the load dump event will protect it from overvoltage. If it must still operate during a load dump, you must decide the spec for a worst-case vehicle load dump; which may be difficult if this is an aftermarket product. Modern vehicles often spec 42V but there are older specs that have a number in the 60V range.

    For a 2A 60V synchronous buck device with low operating quiescent current look at the LM46002.
  • 0 in reply to Alan Martin
    Prodigy 50 points
    Thks Alan, for load dump I will use an external TVS device, so TPS54202 does not need to support it.
    I'll read the app note and then return to you. thks for your prompt reply.
    rgds,
    Agarb Carvalho