Building blocks for future dual-channel GaN gate drivers Arbitrary waveform driver, bootstrap voltage supply, and level shifter

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Abstract

Capitalising on the high-speed switching capability of 650 V GaN FETs in power-electronic bridgelegs is challenging. Whilst active gate driving has previously been shown to help overcome adverse switching behaviour, the best results are likely to be achieved through a combination of uncompromised circuit layout and active gate driving. A fully integrated dual-channel driver would minimise external circuitry and allow power devices to be placed as close together as possible. This would facilitate simultaneous minimization of parasitic inductances in the gate-drive and power-circuit loops. Other benefits would include ease of use, lower BOM cost, and providing a step towards full integration of driver and power stage. This paper presents three circuit blocks vital to the implementation of a fully integrated dual-channel gate driver – A 100 ps resolution, digitally-controlled active gate driver IC, a sub-ns propagation delay level shifter with 200 V/ns slew-rate immunity, and a regulated bootstrap supply that maintains its output voltage regardless of any switch-node undershoot during switching events. Measurement results show the efficacy of the high-resolution active gate driver in a GaN bridge leg, and the sub-ns propagation delay of the level shifter, both fabricated in a 50 V CMOS process. Simulation results demonstrate the slew-immunity of the level shifter, and operation of the bootstrap supply. It is also inferred how to increase the voltage rating of the level-shifter and bootstrap without adversely affecting performance
Original languageEnglish
Number of pages4
Publication statusPublished - 23 May 2019
Event31st IEEE International Symposium on Power Semiconductor Devices and ICs - Shanghai, China
Duration: 19 May 201923 May 2019
Conference number: 31
http://www.ispsd2019.com/dct/page/1

Conference

Conference31st IEEE International Symposium on Power Semiconductor Devices and ICs
Abbreviated titleISPSD 2019
CountryChina
CityShanghai
Period19/05/1923/05/19
Internet address

Keywords

  • GaN
  • level shifter
  • dualchannel gate driver
  • bootstrap power supply
  • Active gate driver

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    Liu, D., Dymond, H., Wang, J., & Stark, B. (2019). Building blocks for future dual-channel GaN gate drivers Arbitrary waveform driver, bootstrap voltage supply, and level shifter. Paper presented at 31st IEEE International Symposium on Power Semiconductor Devices and ICs, Shanghai, China.