rusefi.com

At the moment we are using jlcpcb so their library somewhat affects our designs. Soic8 is easy to solder so not-jlc is totally a possibility, but if JLC works it's one little headache to deal with.

Choosing a driver takes us into heat dissipation world. As a baseline TLE8888 is 550 mohm.

Do we have good thermal test data for TLE8888?

I'm probably attempting to over-design, but my thoughts are below.

The below is a fully protected MOSFET with over voltage clamping. It's rated for 3.5A, and has 120 mOhm for Rds.
https://jlcpcb.com/parts/componentSearch?searchTxt=C146561

This one is slightly more ohms. It may be at it's thermal limit for a 1A injector. I'm quite certain it is at the thermal limit for it's rated current.
https://jlcpcb.com/parts/componentSearch?searchTxt=C22444

The below generates less heat and is much farther away from thermal limits. However your clamping diode is also outside of the thermal shutdown protection. So it could overheat and you would not know. However it's less likely to overheat. I would suggest keeping the diode close to the MOSFET and try to keep them thermally bonded to the MOSFET as best you can.

100V MOSFET
https://jlcpcb.com/parts/componentSearch?searchTxt=C190848

60V MOSFET
https://jlcpcb.com/parts/componentSearch?searchTxt=C181954

Then this TVS diode for active clamping.
https://jlcpcb.com/parts/componentSearch?searchTxt=C84731

Perhaps it could be this zener diode.
https://jlcpcb.com/parts/componentSearch?searchTxt=C48869

I guess, these are also suitable for relays and solenoids? Schematics is the same as in old Frankenstein?
I wonder, are there any suitable drivers among jlcpcb basic parts?
https://lcsc.com/product-detail/MOSFET_Alpha-Omega-Semicon-AO3480_C350817.html

puff wrote: ↑

Sun Apr 26, 2020 5:30 pm

I wonder, are there any suitable drivers among jlcpcb basic parts?

https://jlcpcb.com/parts has the answers

Based on https://rusefi.com/forum/viewtopic.php?p=37075#p37075

VNN1NV04PTR does not work for injectors
BSP76E6433HUMA1 works for injectors

Any thoughts about C20917 for the MOSFET, and C355274 for the clamping?