Mosfet/IGBT Drivers Offer High-Noise Immunity For Efficient Power Supplies


Silicon Labs launched isolated gate drivers for cutting-edge power supply designs by offering exceptional immunity to noise transients caused by high-speed switching. Target applications of the Si827x devices include power supplies for servers, computers and base stations, as well as solar power inverters and microinverters, class D amplifiers, motor controllers, and chargers for electric vehicle/hybrid-electric vehicles (EV/HEV).

Power supply designers often want to maximise power per volume (W/mm3) or power density for which they choose faster switching frequencies. Fast switching improves efficiencies but also produces higher noise transients that can cause signal loss or permanent damage due to latch-up. Power systems use high-power semiconductor switches, such as silicon, gallium nitride (GaN) and silicon carbide (SiC) MOSFETs, which require a high-current isolated driver to control the switch.

This high common mode transient immunity (CMTI) makes the Si827x drivers ideal for fast-switching and noisy power supplies. The devices are said to offer industry-leading noise immunity (200 kV/µs) and latch-up immunity (400 kV/µs), which is twice the immunity rating of other competing devices available.


The devices operate with a wide input range of 2.5 – 5.5V and a maximum drive supply voltage of 30V. The lower input voltage capability of 2.5V enables developers to design systems with a low-voltage power supply that consumes less power, increases system efficiency and is compatible with low-power microcontrollers (MCUs) such as Silicon Labs’ EFM32 Gecko MCUs.

“Silicon Labs’ new Si827x gate driver family solves real-world customer problems, safely enabling fast switching and low-power 2.5V operation with excellent timing specs. The best-in-class noise immunity of our Si827x gate drivers allows developers to safely design power supply systems with fast-switching MOSFETs or faster GaN and SiC switches, which can significantly improve overall system efficiency while enhancing reliability”, said Ross Sabolcik, vice president of power products at Silicon Labs.

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Important features include an under-voltage lockout (UVLO) fault protection, de-glitch feature for filtering noisy inputs, very low electromagnetic interference (EMI) emissions, long lifetimes, fast and accurate timing specs, and a wide temperature range of -40 to +125 °C.

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