EMC Continues from page 39


but, more importantly, it allows large transient currents during supply switchover that contributes to conducted EMI. Ideal diode controllers, such as the LTC4359, replace traditional diodes with low-loss MOSFET control. These controllers regulate a small forward voltage drop across the MOSFET, ensuring smooth current delivery without oscillation. In the event of a source failure or input short, a high-speed pull-down minimises reverse current transients, preventing noise from propagating back to the power bus.


Surge stopper


Traditional TVS-based protection shunts energy to ground, often leaving a high residual voltage that necessitates oversized downstream filters. Surge stoppers, including the LT4356 and LTC4364, take a different approach by actively regulating the downstream voltage. During overvoltage events, these devices control a series-pass MOSFET to limit output voltage and current, dramatically reducing residual surge stress on sensitive loads. These devices drive a series-pass MOSFET to throttle the output voltage to a safe, predefined level during a spike. This suppresses the residual surge that often leaks through passive clamps, making it easier to meet surge immunity requirements without oversized downstream filters.


Integrated eFuses


Electronic fuses (eFuses), including the LTC4368 and MAX17617/MAX17617A, integrate programmable current limiting, controlled inrush, thermal protection, overvoltage and undervoltage protection,


References 1


and fault reporting in a single device. By actively controlling startup behaviour and limiting fault current during overload or short-circuit conditions, these eFuses reduce voltage droop, suppress current transients, and prevent fault-induced disturbances from propagating onto the power bus.


High-side drivers


The LTC700x family of high-side gate drivers provides robust control of external N-channel MOSFETs for high voltage and high current power domains. With features including fast fault response, wide operating voltage range, and precise gate control, these devices enable clean turn-on and turn-off behaviour while limiting inrush current and fault-induced transients. When paired with current-sense circuitry or upstream protection, LTC7000x devices form a flexible and scalable solution for managing power distribution.


Conclusion


As electromagnetic disturbance levels continue to rise and functional safety requirements become more stringent, power supplies must incorporate protection methods that go beyond basic discrete components. Integrated power-path control, active surge regulation, and programmable fault management provide more predictable behaviour and greater robustness when subjected to EMC test conditions. Analog Devices’ portfolio of surge stoppers, ideal diode controllers, eFuses, and high-side drivers delivers proven solutions for improving electromagnetic immunity performance in safety-related systems.


www.analog.com


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ROLEC ENCLOSURES LTD 01489 583858 sales@rolec-enclosures.co.uk


us.lambda.tdk.com/resources/blogs/20250304.html 2


standards.pdf 3


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to Electromagnetic Phenomena.” International Electrotechnical Commission, April 2016. 6


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https://embeddedhardwaredesign.com/how-to-select-a-tvs-diode-to-suppress-transients-in-electrical- circuits/


www.rolec-enclosures.co.uk


40 June 2026


Components in Electronics


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