Matrix LED Drivers Configuration Guide
The Matrix configuration seeks to eliminate some of the problems with Parallel Strings configuration by adding more connections between the LEDs. A diagram of this configuration can be found below in Figure 3.
Basic Operation
The basic layout of this configuration looks similar to the Parallel Strings configuration except that now connections have been added between each of the strings. In effect, each of the first LEDs in each string are now operated in parallel as are the second LEDs in each string. The LEDs are now arranged into a matrix of rows and columns.
Advantages
This configuration still only requires the use a single output driver, and the output voltage remains comparable to that of the Parallel Strings configuration shown in Figure 2. In general, this configuration is more fault-tolerant and should produce better current balance.
Disadvantages
Current sharing remains an issue and it is not as straightforward to add ballast resistors to improve sharing. Non-uniform current sharing leads to non-uniform light and thermal distribution in the lamp. Pre-screening or binning of LEDs is helpful to reducing such an imbalance but is not without its problems.
Failure Modes
If any LED fails short, all of the LEDs in that row will cease to operate. All other rows will operate as normal and brightness of the lamp will be reduced by a factor of 1/r where r is the number of rows. If any LED fails open, the other LEDs in that row will have their current increased by a factor of 1/(1-c) where c is the number of columns in the matrix. All other LEDs will operate normally.
LED Driver Configurations Guide
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