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| H-bridge DC motor driver with OPAMP as gate driver? |
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| Someone:
--- Quote from: Benta on June 25, 2019, 09:54:44 pm --- --- Quote from: Benta on June 24, 2019, 08:57:53 pm ---Yes, certainly! What PWM frequency are you aiming for? How fast do you intend to change direction of the motor? Which kind of motor is it (PMDC, of course, but quality, speed etc.)? --- End quote --- You still haven't answered these questions. If you select logic level MOSFETs for the low side, 74AC04 (2 x 2 in parallel plus inverter before) are perfect for low side drive. For the upper side, static drive is enough for a normal PMDC drive system. --- End quote --- Agreed more information is needed to make better recommendations. For slow switching speeds discrete open collector transistor drivers and pull-ups are completely appropriate. An "old" standard part that can drive both sides is the cmos 4504, but depends on the other performance expected of the whole system. |
| David Hess:
--- Quote from: Benta on June 25, 2019, 09:54:44 pm ---If you select logic level MOSFETs for the low side, 74AC04 (2 x 2 in parallel plus inverter before) are perfect for low side drive. For the upper side, static drive is enough for a normal PMDC drive system. --- End quote --- If the upper side needed to be PWMed also, then an elevated 74AC04 with a 5 volt zener shunt to control its supply voltage could be fed with a simple low output current level shifter. |
| Zero999:
As the motor is only 500mA, BJTs may also be an option |
| Yansi:
500mA motor! Well... could have stated that sooner (or have I missed it?) Use an off-the-shelf H-bridge (with integrated drivers of course), unless pushing for low price badly. |
| SiliconWizard:
I really second the integrated solution, something like the Rohm BD6220F or BD6221F. A couple bucks. Integrated protections, dead-time, etc. I wouldn't bother doing that with a discrete approach unless there was an excellent reason. |
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