Hi there,
I'm new on this forum, so i hope i posted this topic in the right forum section.
I'm using a TLC5947, and i want to drive 1W LEDs. For this is I want to use a buck converter from Zetex; the ZXLD1350.
http://www.diodes.com/zetex/_pdfs/3.0/pdf/ZXLD1350.pdf
The outputs of the TLC5947 are constant current and the input of the ZXLD1350 wants to be hooked to an open collector output. The TLC5947 is an open collector, so that should work.
However, my analog skills are not top notch, and the internal schematic of both the TLC5947 and the ZXLD1350 are unclear to me.
Am i right that i CAN hookup the ZXLD1350 straight to the output of the TLC5947?
Or..should I put a pullup resistor to the output of the TLC5947 and the connect the output (via a resistor divider) into the base of an external NPN transistor? The collector of this external transistor can then be hooked to the input of the Zetex.
I'm very confused in this.
Of course I want to minimize the amount of components on my board, but I am really not sure if i can directly drive the Zetex chip with the TLC5947.
Hope somebody can clear this up for me..
Thanx in advance!
I understand that if i do so, i will have inverted PWM, but doesnt matter, my software can correct that.
Can somebody help me out with this?