Sunday, February 25, 2024

High-Resolution LiDAR With GaN HEMT-Based Laser Driver Reference Design

By Akanksha Sondhi Gaur

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The new 905nm high-power laser diodes and EcoGaN devices enable faster, more powerful laser driving, enhancing LiDAR sensor performance. 

The range of uses for LiDAR sensors is expanding to include autonomous driving and applications in the industrial and infrastructure fields. LiDAR sensors are required to have longer sensing distances and higher resolution. In addition to improving the characteristics of the laser diode, it is necessary to drive it at higher speeds and power. 

ROHM offers a 905nm high power narrow emission width laser diodes lineup. (RLD90QZWx Series) Reference designs include EcoGAN, a next-generation device capable of high-speed drive, along with a high-speed gate driver for GaN HEMTs that contribute to improved LiDAR sensor characteristics (distance and resolution). The new technology significantly enhances the performance of laser diodes, which are crucial in LiDAR applications, by enabling high-speed driving. It incorporates the latest generation of EcoGaN devices, advancing the efficiency and effectiveness of these systems. Additionally, it features a built-in high-speed gate driver designed explicitly for GaN HEMTs (BD2311NVX-C). This technology is available in two circuit types: square wave and resonant, catering to various application needs and providing versatility.

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The specifications detail two board numbers, REFLD002-1 and REFLD002-2. For REFLD002-1, the input voltage required for the Laser Diode Drive is approximately 60 V, while for REFLD002-2, it’s around 120 V. However, both boards require an input voltage of 5V for the Gate Driver. Regarding laser power, REFLD002-1 operates with 905nm at 120W, and REFLD002-2 operates with 905nm but at 75W. The Switching Frequency for REFLD002-1 ranges from 0.1 to 0.5kHz, whereas for REFLD002-2, it is significantly broader, ranging from 0.1 to 100kHz.

ROHM has thoroughly tested this reference design, which includes a block diagram, part list, schematic and more. Please visit the company’s website for further information on this reference design. To explore this design in greater detail, click here.

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