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Topic: Boost-Up Current Limit: L298N ...? (Read 797 times) previous topic - next topic

dgelman

Hello Community,

For my project, I would like to dedicate an L298N for a single motor.

I understand that the L298N has a dual H-bridge at 2A current source.  How would you pin the L298N to dedicate both H-bridges to one motor?

Does it cause any issues to be aware of?

Thank you,
Daniel
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johnwasser

See Figure 7 in the datasheet: "Figure 7 : For higher currents, outputs can be paralleled. Take care to parallel channel 1 with channel 4 and channel 2 with channel 3."
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dgelman

Yes,

Thank you, how couldve I missed that!

Daniel
Dialup is the future.

cr0sh

Note that when you do this (and actually, any time you go over about 1 amp on the L298) you're going to need a fairly beefy heatsink. The L298 is anything but efficient...
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dgelman


Note that when you do this (and actually, any time you go over about 1 amp on the L298) you're going to need a fairly beefy heatsink. The L298 is anything but efficient...


cr0sh,

Even with loading, I doubt my motors will exceed 1A, but my board will consist the SMD package with the thermal pad.  I hope have a fairly large ground plane to dissipate heat as well as perhaps attach a small heat sink on top of chip.

Daniel


Dialup is the future.

JimboZA

But why use an old technology like the 298 anyway?
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terryking228

Quote
But why use an old technology like the 298 anyway?


Can anyone point to a low-cost alternative module that is a good one-for-one replacement for L298N modules like those shown here ? :
http://arduino-info.wikispaces.com/MotorDrivers

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o_lampe

Use DRV8833 for two dc Motors or pololu A4988 for a stepper motor
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jremington


Quote
But why use an old technology like the 298 anyway?


Can anyone point to a low-cost alternative module that is a good one-for-one replacement for L298N modules like those shown here ? :
http://arduino-info.wikispaces.com/MotorDrivers


That page really needs updating! The technology has really been moving ahead, and chips like the A4988 offer current control, much higher torque (with higher voltage motor power supplies) than L298-based drivers, as well as microstepping with just two control pins. I'm very happy with the Pololu boards that I've been using, however they are limited to about 1.5 amps/winding without extra cooling. I'm hoping that Pololu comes out with higher current models soon. See http://www.pololu.com/catalog/product/2133

These not a one-for-one replacements for the L298, but the code needed to drive the board is simpler.

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