Hello
Thank you for your support.
Please advise about Cout and RL selection
Q1 Please confirm
Cout is decided fomula (18) on TPS92314 data sheet.
Please confirm.
ESR of One LED is 2.7ohm? (a)
Or
ESR of 7 LEDs total is 2.7 ohm ( 0.38ohm for one LED)? (b)
I saw following app note.
I' sorry that I don't understand the difference between ' dynamic resistance' in snva253a and
ESR in the data sheet.
Customer will use ILED=350mA and 26 strings.
If (a) were correct, it should be ~1500uF but If xESR is very large.
Q2
If the Cout was decreased by Bias-voltage or temperature,what is the problem?( ripple will increased?)
So, calculation result of Eq (18) should be minimum Cout?
Q3
How do we select RL(49.9Kohm) in the data sheet?
Best RegardsTPS92314_Cout.xlsx