Hi-energy flash LED driver

hardlyWorking

on Mar 14, 2025

Category: Hardware

Product Number: LT3922

I would like to design a hi-energy LED flash driver. This is where i stumbled upon the LT3932 (Buck) and LT3922 (Boost) LED drivers. They have a unique feature that allows them to maintain output voltage, while the LED is turned off. So even after a long off time >> 1s the converter can start regulating the current immediately and doesnt need to start up. These parts would be nice to use, but they dont meet my power requirements. Most other parts i found disable the converter if the LED is turned off longer than 10 ms, causing the output capacitor to discharge which effects the startup time of the converter.

I would like to achive a pulse power of around 30-60 W with 3 V minimum input voltage and a duration of around 1 ms. So 2 A switch current just doesn't cut it.

Now i have two questions:

1. Are there any other parts that can maintain output voltage (Keep the converter running) while the LED is turned off, but allow for higher switch current or even external switches?

2. Considering that 1 ms is not a very short pulse, would it be realistic to use a standard converter and set the soft start time in the region of 100 us or would that be unrealistic?

Tags: power management Step-Up (Boost) LED Drivers hardware Step-Down (Buck) LED Drivers LED Flash Drivers boost converter boost controller LED Driver IC LT3922 Show More

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Hi-energy flash LED driver