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L298n in parallel

Measurements Summary

Part A – One channel driving one motor

  1. Channel 1 driving Motor 1 = 114mA ~= 100mA
  2. Channel 1 driving Motor 2 = 86mA ~= 90mA
  3. Channel 2 driving Motor 1 = 100mA ~= 100mA
  4. Channel 2 driving Motor 2 = 92mA ~= 90mA

Part B – Two channels driving one motor

  1. Channel 1 and Channel 2 paralleled (outputs connected, grounds connected) Step 1 – Channel 1 only Channel 1 output to Motor 1 = 90mA
    Channel 2 output Not connected = 0.7mA Step 2 – Channel 1 and Channel 2 paralleled Channel 1 output to Motor 1 = 52mA
    Channel 2 output to Motor 1 = 48mA Total motor current = 52mA + 48mA = 100mA
    Channel 1 load = 52%
    Channel 2 load current = 48%

Conclusion = nicely balanced

Update 2021mar30hkt1601

Preliminary testing shows that when two full H-bradges are paralleled to drive one motor:

  1. The motor load current is shared between the two channels as 52% : 48%
  2. The total load current is increased by 10%. In other words overall effeciency is 90%

Conclusion: It is a good idea to parallel two bridges for a bigger current

See Part 7 below for more details.

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