3/17/2024 0 Comments H bridge mosfet driver vs bjt![]() ![]() ![]() Input of this stage is an typical digital logic voltage, and output sources/sinks a higher voltage at a few hundred mA. Here's a half-bridge: Q1, Q2, R1, R2, and D1 form a common level shifting inverter. I'm certain I saw it in some semiconductor manufacturer's app note, I just can't remember which one. Play with it and find what you need to find out about it, then find a chip that does everything you are now expecting. Really, a discrete solution is best left for ones' own edification. Don't know if there are external-switch controllers, but by then you're talking HP worth anyway, and a controller / gate drivers / transistors design is hardly an imposition. They're available over 10A and 80V and with high switching frequencies and efficiency, and that's before adding external switches. The obvious answer to all this discrete BS: get an integrated chip instead! There are ICs and modules available for modest prices (usually more than the BOM cost of a discrete solution, but not by much really, nevermind the savings on PCB area and design time), which offer control circuitry (current limiting, forward/reverse step, free run, etc.), MCU interface (I2C or SPI most often), and some serious brains all their own (piles of configuration registers to play with). You were not only lapped, but while restarting the race, you got stuck in a coma while industry went on into space. ![]()
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