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Salvaging and "renew" an IC

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coppercone2:
I do like the idea of that chip being a good solution to the drive the solenoids. IMO a sign of good quality, and possibly reliability, but you might lose that feature if you mess with the chips using weird chemicals.

Solenoids are pretty important devices, you don't want them misfiring.

I take it you tried this ?
https://www.ti.com/motor-drivers/solenoid/products.html

this one being the basis for most of them IIRC
https://www.ti.com/lit/ds/symlink/drv110.pdf?ts=1597106361289&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FDRV110

Keep in mind you might be able to add a feature with a new chip, did you consider trigger and hold currents in the previous design? It is possible to save power and increase solenoid life time by using a chip that can trigger the solenoid then reduce the current to keep it open with less heat (but it might effect vibration resistance some what). I saw these features advertised by Ti for electromechanical drivers. Actually a nice feature.. you would be surprised how hot those valves can get if you never actually worked with one...  and if you ever had a dishwasher break on you, you know how fucking smelly it could be.

And, with modern electronics being better at handling higher currents, you can also consider swapping solenoids to lower voltage higher current ones with little consequence other then wire gauge increase.

Rat_Patrol:

--- Quote from: coppercone2 on August 11, 2020, 12:29:22 am ---I do like the idea of that chip being a good solution to the drive the solenoids. IMO a sign of good quality, and possibly reliability, but you might lose that feature if you mess with the chips using weird chemicals.

Solenoids are pretty important devices, you don't want them misfiring.

I take it you tried this ?
https://www.ti.com/motor-drivers/solenoid/products.html

this one being the basis for most of them IIRC
https://www.ti.com/lit/ds/symlink/drv110.pdf?ts=1597106361289&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FDRV110

Keep in mind you might be able to add a feature with a new chip, did you consider trigger and hold currents in the previous design? It is possible to save power and increase solenoid life time by using a chip that can trigger the solenoid then reduce the current to keep it open with less heat (but it might effect vibration resistance some what). I saw these features advertised by Ti for electromechanical drivers. Actually a nice feature.. you would be surprised how hot those valves can get if you never actually worked with one...  and if you ever had a dishwasher break on you, you know how fucking smelly it could be.

And, with modern electronics being better at handling higher currents, you can also consider swapping solenoids to lower voltage higher current ones with little consequence other then wire gauge increase.

--- End quote ---

The biggest issue with finding a replacement is the 100v DC boost voltage with high/low mosfets to control. The Bosch driver I found will work, but it will take that translation micro, but that probably wouldn't be the worst thing. This isn't my PCB design, I was approached to produce new boards for these old machines. I have the PCB schematics, but I do not have access to any of the software builders for the micros that are on the board already, so I have to tip toe around messing with operations of the current 2 micros.

As far as the current drivers, even on the PCB schematic they are labeled ASIC, and have a custom part number. New units are just not available.

coppercone2:
100vdc is a bit hit for solenoids I think??

T3sl4co1l:
Why would anyone make an ASIC for what can be done with MOSFET pairs cascoded on top of ULN2003s..?

Tim

coppercone2:

--- Quote from: T3sl4co1l on August 12, 2020, 01:35:58 am ---Why would anyone make an ASIC for what can be done with MOSFET pairs cascoded on top of ULN2003s..?

Tim

--- End quote ---

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