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My system works on parallel connection led string. So, cv mode is more efficient for my design. But ı am not sure TPS92205x is work with cv mode. How can ı start this device as cv mode?
Let's say we have 8 series 7 parallel led connection and total led current 700mA. In theory, each string will get 100mA. And if we cut off one rope, there will be six strips left in the circuit, and the current flow in each strip will rise to 116mA. This high amount of current will cause damage to the LED lights, so it is better to use a constant voltage LED driver in LED strips/strings.
However, if you are going to drive an LED string with a CV regulator, you cannot guarantee that the output current will be 100mA * 7 (Let's continue on the example you used above) and each string will get an equal 100mA due to LED manufacture variation.
If you want to maintain equal current and open protection to each string, I recommend you try this method: first step-down your 48V input voltage to a middle level, for example 27V, then use a multi-channel LED driver like LM3464 / LM3463 to drive each string with separate channel.
Thanks for the suggestion. My system needs very high pwm dimming ratio and accuracy. I think LM3464 / LM3463 doesn't provide that features. But ı will use these multi-channel driver someday.
Requirements are unclear yet. But it's better have minimum 2,000:1 dimming. Going back to your first answer. Yes, each strip cannot guarantee that the output current will be get equal 100mA * 7. But if cut off one rope, other strip will not affect that. That is why ı think cv mode is more suit than cc mode. So if I want to start the TPS92205x driver in cv mode, how do I do this?
Sorry but TPS92205x is not designed to work in CV mode while achieving the 2,000:1 dimming ratio. The CV mode is mainly used in battery-charging application.
To achieve the minimum 2,000:1 dimming ratio, you should use TPS92205x in CC mode.
