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Industry’s fastest isolated gate driver for high-voltage applications 

Industry’s fastest isolated gate driver for high-voltage applications 

New Products |
By Nick Flaherty



The UCC21520 can be used as an isolated driver in low-side, high-side, high-side/low-side or half-bridge power management designs. With its integrated components, advanced protection features and optimized switching performance, the UCC21520 enables designers to build smaller, more robust designs for enterprise, telecommunications, automotive and industrial applications. 

“This is definitely targeted for MOSFETs rather than IGBTs,” said Sridhar Nagarajan, Product Marketing Manager at TI. “Right now we are looking at it a standalone gate driver so the customer can add any MOSFET. If you look at the CMTI common mode transient immunity you need over 100V/ns, the slew rates need to be very high for devices such as SiC MOSFETs.

“High performance is both high power and power density, and people are hungry for more and more data, so they need to cram in all the technology into a given space so power supplies are trending to higher power density. To do that you need to reduce the switching losses and the short rise and fall times help with that, and the switching frequencies are higher, and at the end of the day they are looking at faster switching and MOSFETs are the way to go,” he said.

The UCC21520 provides reinforced isolation of 5.7 kVRMS and surge immunity tested up to 12.8 kV, along with common-mode transient immunity of 150 V/ns. By delivering the industry’s fastest propagation delay of 19 ns and the tightest channel-to-channel delay matching of less than 5 ns, the device enables high power density and efficiency, resulting in smaller solution size and reliable operation over end equipment lifetimes.

The 4 A source and 6 A sink current reduce switching losses via faster rise times of 6 ns and fall times of 7 ns for a 1.8-nF load in high-frequency switch-mode power applications and supports a wide input voltage of 3 V to 18 V, programmable dead-time control, and dual channeling and paralleling of outputs. The standby power, as low as 1 mA per channel, helps increase energy efficiency.

Engineers can pair the UCC21520 isolated gate driver with a TI controller to optimize their system performance. Analog controllers include the UCC28950 for phase-shifted full bridge designs, the UCC25600 for resonant mode power supplies and the UCC28070 for power factor correction (PFC). TI digital power controllers include the UCD3138 and C2000 32-bit microcontroller.

The UCC21520EVM-286 evaluation module and PSpice/SIMPLIS transient models are available now along with a block diagram, design files and bill of materials for a Reference Design for Reinforced Isolation 3-Phase Inverter with Current, Voltage and Temp Protection (TIDA-00366).

The UCC21520 is now available in the TI store and through the company’s authorized distribution network. The isolated gate driver comes in a 16-pin plastic small outline (SOIC16) wide-body package and is priced at US$2.40 in 1,000 unit-quantities.

More on TI’s gate driver portfolio and isolation solutions.

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