I am trying to create a schematic for driving two WP154A4SUREQBFZGC RGB LED diodes using ON Semiconductor's CAT3626 and here is my schematic: RGB LED Driving Schematic and here is proposed circuit from CAT3626's datasheet: Proposed Circuit Kingbright's RGB LED Altium's part library was downloaded from SamacSys webpage. Now, I am confused since I've connected anodes to PWM outputs of CAT3626 because I want to control every color of each diode indepedently, but in datasheet there is a connection as we can see from 2nd image Common Anode Configuration. How do I transform my schematic so it will comply with CAT3626 "rules"?


Use the common anode WP154A4SEJ3VBDZGW/CA
You selected the common cathode.

enter image description here

  • \$\begingroup\$ So, I selected wrong RGB LED itself, am I right? And I need to upgrade schematics with voltage divider for red channel, becuase it needs 2.2 (max 2.8) V? \$\endgroup\$ – KernelPanic Sep 10 '18 at 6:20
  • 1
    \$\begingroup\$ Yes, you selected the wrong LED. You should not need to treat the red any differently. Each output channel (A,B, and C) the current is programed individually. It's a current regulator so as long as Vout is sufficient (greater than max Vf) for all three channels the forward voltage does not matter. \$\endgroup\$ – Misunderstood Sep 10 '18 at 12:41

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