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Ideas For High Side Drivers 
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There are certain things which must be driven from the high side if no mods are desired. For example:

  • MX-5 fuel pump relay
  • Chevrolet LSx fuel pump relay
  • VTEC solenoids

etc.

What are some good topologies for driving such things reliably and effectively? Share your ideas!

I'm interested in stuff that can handle turn off spikes (relay coils) and/or PWM, between say 100mA and 10A or there abouts.

Hit me with what you've got!

Fred.

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Fri Sep 13, 2013 9:15 pm
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QFP80 - Contributor

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Location: Scarborough, ON
IR3315S - high side driver with current sense and shutdown.


Attachments:
IR3315S.pdf [989.84 KiB]
Downloaded 213 times

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Fri Sep 13, 2013 10:53 pm
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LQFP144 - On Top Of The Game

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Image
In line with my usual sub par documenting. I have no idea what any of the unlabeled values are, and it seems like I ended up putting a 0.1 Ohm resistor next to the coil for some reason. It didn't seem to make my vtec work so it didn't get installed on my current board. I'm pretty sure my heads aren't vtec capable even though most of the hardware it there. Also I'm pretty sure that the 10k resistor was tied to ground, and on the wrong side of the 470 resistor creating a voltage divider by accident. I'm not sure what (mos)fet I used. I need to find my old board.

Edit: Fred's doesn't like that it's a low side driver, but I was posting to show what didn't work for me, and for the flyback diodes to protect things from voltage spikes.
Edit2: I am/was wired into both sides of the solenoid.

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Fri Sep 13, 2013 11:46 pm
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On Semiconductor NVC8460

6A High side switch.
Fully protected, short circuit, thermal, ect.
Has diagnostic feedback for Open load and such.
3.3 or 5v input

I haven't used it yet, but have it on a current design & I should have pcb layout done this week. I'm just using it to fire an external fuel pump relay. After I test it, I'll post back some results. Although, I don't expect anything earth shattering either way assuming it behaves like it should. It's just a general purpose automotive high side driver.

Lenny


Mon Sep 16, 2013 2:24 am
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Here are a few interesting high side driver components to consider:

ST Microelectronics VN5E160ASTR-E, SMD SOIC-8 package
http://www.digikey.com/product-detail/en/VN5E160ASTR-E/497-11684-1-ND/2746913

Infineon Technologies BTS6143D, SMD DPAK-5 package
http://www.digikey.com/product-detail/en/BTS6143D/BTS6143DINCT-ND/1557906

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Thu Sep 19, 2013 3:49 pm
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There are way too many flavors of single IC for this application. But this is my preference...

I prefer a more primitive design for such a primitive task. I like to use a double P-FET and 1 N-FET configuration. I know it is clunky with so many components, but it is easily sourced and will never obsolete.

Here is similar example (not my drawing, but similar configuration for quick reference). Just replace the BC165 NPN transistor with a N-FET. And source any P-FET.
Image


Last edited by DanMoto on Mon Sep 23, 2013 10:52 pm, edited 2 times in total.



Mon Sep 23, 2013 8:45 pm
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DeuceEFI wrote:
Here are a few interesting high side driver components to consider:

ST Microelectronics VN5E160ASTR-E, SMD SOIC-8 package
http://www.digikey.com/product-detail/en/VN5E160ASTR-E/497-11684-1-ND/2746913

Infineon Technologies BTS6143D, SMD DPAK-5 package
http://www.digikey.com/product-detail/en/BTS6143D/BTS6143DINCT-ND/1557906


I like the BTS6143D. Good find. :mrgreen:


Mon Sep 23, 2013 9:40 pm
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DeuceEFI wrote:
Infineon Technologies BTS6143D, SMD DPAK-5 package
http://www.digikey.com/product-detail/en/BTS6143D/BTS6143DINCT-ND/1557906

Just found out the hard way that this part is not suitable without open-collector intervention. It requires ground to switch on. Apparently 5V is close enough to ground for all intents and purposes. I need to rip it out or most likely add a transistor in.

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Tue May 06, 2014 8:20 am
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