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TPS61040: TPS61040 - definition of the soft start feature

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Part Number: TPS61040

Hi there,

I want to use the TPS61040 as a backlight driver (schematic as datasheet figure 21). During start-up there is a delay of 250us between setting the EN-pin to high and the switching of the power-MOSFET (SW-pin).

How are the 250us defined? What is the maximum delay I can expect the SW-pin to start switching?

As a backlight frequency I use 200Hz. This means that I always loose 5% of the brightness and has unwanted influence on the linearity of the brightness. Is there a way to shorten this start-up delay and also shorten the soft start?

Thanks for all feedback in advance.

Kind regards,

David


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