Warning:
When the power is turned off, be cautious of the high voltage that can occur due to inductive loads. This voltage can be dangerous and may cause damage to connected components.
Potential Issues:
When the current through an inductive coil is suddenly interrupted, a large voltage spike can be generated (L * dI/dt). If not properly managed, this spike can exceed the voltage rating of control devices, leading to failure or damage.
Recommendations:
To prevent damage from these voltage spikes, it's essential to use protective components such as transient voltage suppression (TVS) diodes or varistors. These components help clamp the voltage and absorb the energy from the inductive kickback. In some cases, a freewheeling diode combined with a continuous protection diode can also be used to safely dissipate the stored energy.
Important Notes:
- Ensure that all protective components are rated for the expected current and power levels. Overheating can reduce their lifespan or cause them to fail under stress.
- For surface-mount device (SMD) varistors, avoid direct connection to VBAT unless specifically recommended by the manufacturer. This helps prevent reliability issues and potential long-term failures.
- Always consider the operating environment when selecting components. Factors like temperature, humidity, and mechanical stress can affect performance and longevity.
- It’s good practice to simulate or test the circuit under real-world conditions before final deployment. This ensures that the protection mechanisms will function as intended during actual operation.
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