Category: Datasheet/Specs
Product Number: LT3041
Hello
I have some questions related to building LT3041 arrays in Voic configuration...(Assume R1=Vfb resistor, R3 = limit Vmax, and R2 )
1. Is it correct to assume that the value of Vref in any Vioc type scenario (in this case its LT3759 with +1.6V = Vref and -0.8V for negative) represents ultimately the Voic limit?
If Voic=Vfb(R1+R2/R1) then the smallest ratio is when R2 = 0. Which then sets Voic = Vfb.
Please advise
2. When calculating the proper R3 values (for establishing an upper ceiling for Vmax-in)
What specific value is to be applied to Isink ? What is a good practice? Could you please explain thank you.
R3 = Vmax - Vfb(R1+R2/R1) / (Vfb/R1+ Isink)
Basically here it says that if R2 is zero then R3 is basically V(max)-V(fb) divided by the sum of I(sink) and I(R1).
For our initial prototype I had assumed 250uA as max I(sink) current.
3. if we assume an inverting configuration then Vfb becomes -0.8V (with the sister chip LT3099)
Which ostensibly would reduce Vioc significantly in the negative array (and reduce power loss etc.)
Is there a way to reduce Vioc in the positive regime?
Hope this makes sense.
Please elaborate. Thank you
