Multi-Channel LED Driver Guide
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Multi-Channel LED Driver Guide

Posted Date: 2024-02-02

This article will explain the basic operation and configuration of a multi-channel LED driver. For a better understanding of its advantages and disadvantages, examples and illustrations are also provided.

In multi-channel configurations, the drivers become more complex, but the system overall becomes more robust. This configuration is shown in Figure 1 below.

Basic operations

Assuming again that a lamp uses 24 LEDs, these can be broken down into 4 strings of 6 LEDs as before. However, these strings are not concatenated together but remain independent. The driver is designed to maintain four independent constant current outputs, each connected to a string. This has the advantages of a series connection in terms of robustness and current regulation accuracy for each diode; however, it keeps the string voltage as low as the other basic configurations.

advantage

High-precision current regulation can be achieved using the string voltage to alleviate safety concerns. Failure of any string will not affect other strings.

shortcoming

The cost and complexity of drives increases, although not as much as four separate drives.

failure mode

If any LED short-circuit occurs, the other LEDs in the string continue to operate normally, and the total lamp brightness is only affected by 1/n, where n is the total number of LEDs in the lamp. If any LED fails to turn on, all LEDs in the string will stop operating while the other strings will operate normally. In this case, the total brightness is affected by 1/s, where s is the total number of strings in the lamp.


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