Hi and thanks in advance for your help !
I am working on an application that requires fast (6-24KHz) strobing of LEDs at high-ish power (500-1000mA @~2-3V, ~1-2W per LED) for a line-scan machine vision application.
The goal is to sync the light emitted to the lines captured by the camera to switch between light sources every second line. The camera is able to output single-ended 5V or RS422 sync signals for the duration of the pulse.
The expected duty cycle is only about 1-5% to prevent heat buildup and keep the exposure time very short. In our use, this may mean pulse times down to about 2µs, with 5-10µs being more typical.
I have found the LT3932 driver, which seems tailored to high-speed and high-power machine vision strobing applications, which can also tolerate a long off time between strobes, which is exactly what I am looking for. The only interrogations I have regarding this driver so far are the rise time and repeatability of the light intensity between pulses :
- The rise time seems to be about 1µs from graphs I could find, but I could not find it specified in the datasheet? It is an important consideration if we are to use pulse times as low as 2µs.
- The repeatability of light intensity (total light emitted over the pulse period) between pulses is very important and should be close to 100% since we are constructing an image line by line by pulsing light for each, and any variations in brightness between lines would be very noticeable.
So far, the LT3932 looks like an excellent choice, hence why I am asking these additional questions, but I am also very much open to suggestions for other parts as well !
Thanks again for your time and help !
Best regards,
Adrien