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Keep symmetric placement (and layout) for all three half-bridges. This avoids additional high-trace resistance and inductance, which could lead to dangerous voltage spikes. Parallel trace for high-side MOSFET gate and source avoids switching oscillations caused by loop inductance. Place power filter capacitors as close as possible to the driver‘s supply pins. The 4.7µF ceramic capacitor on 5VOUT should be placed with its ground return going directly to the ground plane. Use as short and as thick connections as possible. The motor supply voltage pins should be decoupled by ceramic capacitors. Additional electrolytic capacitors help reducing electrical noise and avoid swing over destroying the circuit in lab setups, where the power supply may suddenly be connected or disconnected.

PTM Published on: 2019-08-08