Popular Discussion
Welcome, 匿名
Legend
Community Member
Power Integrations Engineer Power Integrations ModeratorLNK406EG LED driver
I am wondering are there any design equations or more details on how to set output current and voltage as well as other functions when designing with the link PH series. I have the data sheet and the RDR-194 demo but no where does it give design equations to modify output settings. I have tried the PIXI spread sheet but there seems to be inconsistancy on what schematic it is using ( RV2 is going to ground on data sheet and in series on app note).
Also is there a larger or clearer size schematic available, The ones on the app notes are so small and fuzzy I can hardly read.
Thanks
Tom Brooks
Permlight
1 reply | Created on Sep 1, 2010 14:52 PM by Tbrooks
Tbrooks
PIXls can provide necessary calculation for your design with LinkSwitch-PH. It also helps you to fine tune the power supply after you get some initial test data from the prototype.
While RV is for the resistor connecting the positive side of peak line voltage detector capacitor to V pin (as shown in Figure.1 of the datasheet), RV2 is the resistor connecting from V pin to ground. Different combination of the two V pin resistor values give different current regulation over line voltage and dimming range for different applications. In some applications, a couple of resistors are put in series to get the value for RV or RV2 when you cannot find a single resistor to be the same value as calculated by PIXLs.
As for the larger and clearer schematic, are you referring to the one in RDR-194 report? If so, you can refer to Figure 6 in the datasheet. Please note some of the component values may have been modified as we updated the reference design. So please verify the two schematics and BOM carefully.
Jiangming Yao | 205 posts 