The recommended PCB layout for the A5940GLKTR-T involves placing the device near the motor windings, using a solid ground plane, and keeping the high-current paths short and wide. A 4-layer PCB with a dedicated power plane is recommended.
The sense resistor value depends on the motor current and the desired current sense accuracy. A higher sense resistor value provides better accuracy but increases power loss. A good starting point is a 0.01 ohm to 0.1 ohm sense resistor.
The maximum operating temperature of the A5940GLKTR-T is 150°C. However, the device can be operated up to 175°C for short periods of time. It's essential to ensure proper thermal management to prevent overheating.
The A5940GLKTR-T has built-in overvoltage protection, but it's still recommended to add external protection circuitry, such as a TVS diode or a zener diode, to protect against voltage transients and spikes. Undervoltage protection can be achieved using a voltage supervisor or a reset IC.
A decoupling capacitor value of 10uF to 22uF is recommended, depending on the operating frequency and the motor's inductance. The capacitor should be placed as close as possible to the device's power pins.
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