LYTSwitch-4 formulas

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Is there any document that gives design formulas for the FEEDBACK current and the VOLTAGE MONITOR current? Also, is there information on how these to currents are used to control the output LED current? I've been using the latest PI software, but I would like to know more about the operation of the chip. The datasheet doesn't help me much and there's a lot of "hand waving" type language in the reference designs.

Hi,

Yes the formulas are not shared for proprietary reasons.  It is another reason why we have developed the PI software so that you can easily use it to design your product.

 

Basically for this device the relation is:

As IFB is increased the output current will increase.

As Iv is increased the output current will decrease.

Some parameters that are measured and monitored are the drain current and voltage internal to the IC.

 

Regards,

PI-Jono