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TPS92662-Q1: Can 3 LED connected in serires be connected between LEDx and LED x-1?

Part Number: TPS92662-Q1

 Hello guys,

 One of our customers is considering using TPS62662 for their new products. The customer has the following question. Could you please give me your reply or any comment?

 Question: They want to use a LED has 3.3V Vf as typical value with TPS92662, According to TPS92662 datasheet, the recommend condition of VI(LEDx-LEDx-1) is 16.2V. So they want to connect 3 LED in series between LEDx-LEDx-1 for higher brightness. Is this usage  no problem? 

 Your reply would be much appreciated.

 Best regards,

 Kazuya Nakai.