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TPS61169: How does TPS61169 supports the multi-strings Backlight LED

Part Number: TPS61169

Hi,

TPS61169 only have 1 output channel. Here’s the case: our backlight LED have two strings, and there’s 8 LED on each string. If we connect both of this two strings on this 1 output channel of TPS61169. Considering that the working voltage of each LED varies from each other. It may cause the current of each string different. And this will result in the different use lifecycle of these two LED strings. So we would like to ask that how does TPS61169 supports parallel(multiple) strings user case? 

Thanks.

BR

Mason