Figure 1 below shows the "H" in the H-bridge.įigure 1. It contains four independently controlled FETs (or BJTs, but FETs are more common nowadays) that serve as the switching elements used for channeling current flow through the load-typically an inductive load, such as a motor. H-Bridge-A Brief ReviewĪn H-bridge is a rather simple circuit. One example of these gate-driver ICs is the DGD0506 from Diodes Incorporated.īefore going any further into the modes of decay, let's have a quick analysis of the H-bridge. The DRV8801 is an H-bridge motor driver that offers various features including slow decay current mode and fast decay current mode, as well as having a low-power sleep mode which was a requirement for my battery-operated project.Īlthough the DRV8801 includes the FETs that make up the H-bridge-this is also the case with the MAX14870 from Maxim, which was used as a motor controller in our C-BISCUIT design-there also exist other motor drivers that allow designers to use external FETs. Now, I could've used FETs, diodes, and I/O ports on my chosen microcontroller to manually control the direction of the DC motor-and I was very tempted to take that approach-but that was before I came across TI's DRV8801PWPR motor driver. My Own Introduction to Modes of DecayĮarlier this year I designed a PCB that required the use of a brushless DC motor with the end application mandating that the motor operates in both directions (clockwise and counterclockwise). In this article, we take a look at the difference between slow decay mode and fast decay mode, why these names are used, and how they influence motor deceleration.
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