I am digging for a few days to use PNP transistors with TLC5940, because I want to use only PWM pulse not TLC’s current sink.
I will connect a PNP(2n2907) to each output on a TLC5940 with 2 resistors and 4 LEDs with a resistor connect to a PNP. So TLC5940 works only to generate PWM pulse.
I attached the circuits that I will apply.
I know Load on collector side is the ordinary circuit like ‘A’ when using PNP, but I could find an example like ‘B’ and I think it is more useful in my case.
But, I am not sure circuit ‘B’ is same as ‘A’. That is what I want to ask.
Is there any diffenence between ‘A’ and ‘B’ ?
One thing more, I will use two resistors before base on a PNP to reduce voltage on a TLC’s output.
Do you think that is rigth way to do ?