Isolated gate drivers will handle SiC, GaN, and silicon switches

Isolated gate drivers will handle SiC, GaN, and silicon switches

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ADuM4120 and ADuM4121, from Analog Devices, are small form factor isolated gate drivers designed for the higher switching speeds and system size constraints required by power switch technologies such as SiC (Silicon Carbide) and GaN (Gallium Nitride), while still providing reliable control over switching characteristics for IGBTs and MOSFETs.
By Graham Prophet


They use ADI’s iCoupler isolation technology combined with high speed CMOS and monolithic transformer technology to enable ultra-low propagation delay without sacrificing common mode transient immunity (CMTI) performance.


Legacy alternatives such as optocouplers or pulse transformers, ADI says, struggle to deliver shorter delay and maintain CMTI performance; it designed ADuM4120 and ADuM4121 to accomodate the higher switching speeds of the new inverter architectures. In systems requiring multiple power switches, these small SOIC packaged isolated gate drivers minimize PCB layout space and reduce cooling requirements. Their small size allows the gate drivers to be located close to the power switches to reduce the parasitic inductance between the driver and the switch. Operating over a high temperature range and high working voltages, the ADuM4120 and ADuM4121 can hel improve the energy efficiency and timing performance stability of solar inverters, motor controllers, and industrial inverter applications.


All four devices in the new series are 2A output, single-channel gate drivers that provide 5 kV rms isolation with low propagation delay and CMTI performance of >150 kV/μsec. Operating with an input supply ranging from 2.5V to 6.5V, these isolated gate drivers provide compatibility with lower voltage systems with the benefit of true galvanic isolation between the input and the output. The ADuM4120 and ADuM4120-1 provide thermal shutdown for over temperature protection. The ADuM4120 with input glitch filter reduces system noise on the input pin that could trigger a false output, while the ADuM4120-1 without glitch filter supports 33 nsec typical propagation delay. The ADuM4121 and ADuM4121-1 are available with an internal Miller clamp for added protection. The ADuM4121 device is also available with the thermal shutdown. Prices are in the range $1.58 to $1.87 (1000).


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