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Home/Questions/Q 2475
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dev krishnan
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dev krishnan
Asked: September 2, 20222022-09-02T16:26:24+05:30 2022-09-02T16:26:24+05:30In: LEDs & Optoelectronics

How STLD40D Driver Work?

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Hi everyone

I’m going to use STLD40D Driver IC for my TFT LCD. For driving LCD backlight, I’v chosen this Driver from ST. But I can’t figure out the function theory of this driver.

could you please explain for me the STLD40D function theory and how to use that?

thank you in advance.

driverICledstld40d
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    1. vikas Nagpal
      2022-09-09T10:09:29+05:30Added an answer on September 9, 2022 at 10:09 am

      Well, the STLD40D is a boost converter. The function is also described in the data sheet, section5.1. It must be taken into account that the converter not only has a min off time, but also a maximum on time. The switch- on moment is particularly interesting firstly there's no FB signal, so the powerRead more

      Well, the STLD40D is a boost converter. The function is also described in the data sheet, section5.1.

      It must be taken into account that the converter not only has a min off time, but also a maximum on time.
      The switch- on moment is particularly interesting firstly there’s no FB signal, so the power stage is switched on( SW to GND), which charges the boost inductor. As there isn’t yet enough affair voltage to drive a current through the LEDs, pin FB remains zero. still, the maximum on time now kicks in and switches the power stage off again, whereby the energy stored in the boost inductor is delivered to the LEDs at a high voltage and results in a corresponding current and a signal to FB. From now on, FB can regulate normally.

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