Warning:
Always be cautious of high voltage that can occur when the current is turned off, especially when dealing with inductive loads. This voltage spike can be dangerous and may cause damage to your circuitry if not properly managed.
Potential Issues:
When the current through an inductive coil is suddenly interrupted, a large voltage spike (L * dI/dt) can be generated. If no protection is in place, this spike can exceed the voltage rating of control components and lead to failure or even permanent damage to the system.
Recommended Protection:
To prevent such issues, it's essential to use protective components like a Transient Voltage Suppression (TVS) diode or a varistor. These devices help clamp the voltage spikes and protect sensitive electronics. In some cases, a freewheeling diode combined with a continuous protection diode can also be used to safely dissipate the energy from the inductive load.
Important Notes:
- Ensure that all protective components are rated for the expected current and power levels to avoid overheating. Consider derating them if necessary for added safety.
- Avoid connecting SMD varistors directly to VBAT, as this may lead to reliability problems over time due to voltage stress or thermal cycling.
- Always verify the compatibility of the protection components with your specific application and operating conditions.
By following these guidelines, you can significantly reduce the risk of damage caused by inductive voltage spikes and ensure the longevity and reliability of your electronic systems.
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