Designing L298 with discrete components

Thread Starter

crazybuoy

Joined Sep 19, 2010
77
Last time, I used L297 & L298 driver for bipolar motor, but L298 has 2A limit. Please help in designing L298 with discrete components. I want to use mosfets instead of transistors.

Thanks
 

Thread Starter

crazybuoy

Joined Sep 19, 2010
77
I have IRFZ44 n-mosfet and its equivalent p-mosfet (not remember its name). I will try to use 12-24v and adjustable current through L297's Vref volt and bridge's sense resistor combination.
 

Thread Starter

crazybuoy

Joined Sep 19, 2010
77
I want L298 to use with L297,but L298 made with discrete components. For designing L298 with discrete components, I want to use power mosfets instead of power transistors.
 

Thread Starter

crazybuoy

Joined Sep 19, 2010
77
I found someone designed L298 with discrete components. Here he used transistors but I want to use Mosfets (IRFZ44 n-mosfet and its equivalent p-mosfet).

Please help me how to replace transistors with n or p mosfets. I should work with L297 directly for bipolar stepper motor like L298 chip.

 

SgtWookie

Joined Jul 17, 2007
22,210
HP1729, your suggestion will result in smoking rubble, as once the P-channel MOSFETs are turned on their is no current path to turn them back off, and when their corresponding N-channel MOSFET turns on, the current from the source will be limited only by the Rds (ON) of the MOSFETs and the sense resistor.
 

hp1729

Joined Nov 23, 2015
2,304
HP1729, your suggestion will result in smoking rubble, as once the P-channel MOSFETs are turned on their is no current path to turn them back off, and when their corresponding N-channel MOSFET turns on, the current from the source will be limited only by the Rds (ON) of the MOSFETs and the sense resistor.
Thank you, of course you are right. Not a big problem to add a few resistors.
 
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