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TLC59116: About saturation voltage

Part Number: TLC59116

Hello,

Regarding to saturation voltage on TLC59116, my customer is asking a question.

 

(Question)

What is the saturation voltage on LED channel?

(What is the voltage between input and output on saturation?)

For example, my customer will use 4 LEDs in each output channel.

Total LED output voltage is 14V(3.5V(Vf) x 4), channel output current is 20mA.

In this case, how much input voltage is needed for output voltage 14V?

(Of course, we need to consider the variation of Vf.)

 

Regards,

Tao_2199