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L298n connecting in parallel

Guorishix

Feb 18, 2022
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Hello! I would like to ask for some advice or help if my wiring is appropriate as shown in the photo. I am using 2 L298n motor drivers to actuate 4 peristaltic pumps (runs @400mA each, hence, 1.6A total max current when all pumps actuating). I am powering these modules using as 12V power supply in parallel and will be hooked to a Raspberry Pi microcontroller for control. I am wondering if such parallel connection would be ok and if are there any problems I might encounter since I it's my first time handling with motors for my small automation project. Thanks!
 

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kellys_eye

Jun 25, 2010
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I am wondering if such parallel connection would be ok
Providing the power supply can deliver the minimum required current you should be perfectly ok. Additional supply smoothing capacitors at the DC input of each board would help.
 

Guorishix

Feb 18, 2022
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Providing the power supply can deliver the minimum required current you should be perfectly ok. Additional supply smoothing capacitors at the DC input of each board would help.
Alright! Thank you very much
 

Alec_t

Jul 7, 2015
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Bear in mind that the start-up (stall) current of a DC motor will usually be several times its normal running current.
 

Guorishix

Feb 18, 2022
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Bear in mind that the start-up (stall) current of a DC motor will usually be several times its normal running current.
I see. If I understood it right, you mean I would have to mitigate those spikes at startup and maybe use smoothing capacitors? Just like what the previous post suggested
 

bertus

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Nov 8, 2019
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Hello,

As @Alec_t said, the start-up (stall) current can be much higher.
The start-up current can be upto 5 times the running current.
So 2 Amp for each pump.
Do you have details on the used pump?
Are there other currents given in the datasheet?

Bertus
 

bertus

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Hello,

You could parallel two channels of the L298 to drive one pump:
L298_parallel.png
The complete schematic would be this for the 4 pumps:
l298 pump control.png

Bertus
 

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Guorishix

Feb 18, 2022
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hmm, so connect the two outputs on each side? initially it would have been +out1, -out2 and vice versa, in the above schem, where does the ground go?
 

Guorishix

Feb 18, 2022
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so in this case, i'd have only either pumps active to drive enough current?
 
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