hello guys,
i am pwm'ing some electromagnets using 293b. each magnet draws 1ampere which is the ic's maximum rating.
Question 1. should I go for a higher rating hbridge ? any recomendations ?
Question2. I was using the control inputs succesfully so far (instead of the enable pin). Is it the same as using the enable pin for pwm ? it needs less pwm channels this way.
thanks a mega.
Do you need to drive the electromagnet in both directions? An H-bridge is only
needed for bi-directional drive, otherwise a switching transistor or MOSFET is
enough.
hi, yes I need bi-directional driving.
I have read that you can, within limits, stack (connect in parallel) L293 chips to increase current capacity. Google "stack 293".
I have used the enable and control inputs to PWM and either way works fine.
hey thanks,
im looking at the SN754410, seems like a cheaper option.
anyone knows if it includes protective diodes ? im too dumb to understand http://docs-europe.electrocomponents.com/webdocs/0b87/0900766b80b878b5.pdf
i was using the control inputs too, but have some issues now, voltage drops, magnets pulsating after a while
and im trying to trace the bug.
I have, also used the 754410 chips and the indeed do have the flyback diodes internal.