eGaN FETs for Lidar – Getting the Most Out of the EPC9126 Laser Driver
Lidar is a form of radar where the electro-magnetic radiation happens to be in the optical band [1, 2]. In the last few years,one particular form of lidar, time-of-flight (TOF) distance measurement, has become popular. If a laser is used as the optical source, one can measure the distance of a small spot even at a long range. When combined with steerable optics, one can sweep the spot distance measurement and map objects in 3-D space.
EPC has developed the EPC9126 and EPC9126HC laser drivers to demonstrate the performance of eGaN FETs in lidar systems, and to advance the lidar state of the art[3, 4]. The EPC9126 and EPC9126HC are both provided with Quick Start Guides (QSG) that provide basic information on getting up and running along with schematics and bills of materials. Layout files for the drivers are also freely available.
However, while the basic principle of the laser drivers seems simple, the high speeds, voltages, and currents result in the dominance of parasitic components that many engineers are used to ignoring or designing away.This document was written to answer common questions and to provide more depth on laser driver design, so that the user can get the most out of their driver.
Please note that this application note is intended as a complement to the QSG, and the user should have both handy when learning about and applying the EPC9126 and EPC9126HC .
Conclusions：The superior performance of GaN power transistors enable groundbreaking laser driver performance. The ability to generate single digit nanosecond, high current pulses to deliver hundreds of watts from a few square millimeters is truly remarkable. It is one of the main factors in making affordable, high performance lidar possible in a small form factor thus fueling the lidar revolution.
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EPC9126 、 EPC9126HC 、 SPL PL90_3 、 TPGAD1S09H 、 EPC2016C 、 EPC9126xx 、 EPC2212 、 EPC2001C 、 EPC2022 |
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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2019/05/05 |
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AN027 |
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2.8 MB |
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