Cirrus Logic AN374 - Manual (Page 18)

AN374
18 AN374REV2
5 Design Flowchart
Figure 8 shows the flowchart for eliminating incompatible light engines.
Yes
No
Yes
No
Yes
No
Pick a light engine
candidate across dim
Compute peak currents
for a given transformer
using AN368
Start
Polynomial
approximation
possible?
Non-zero
currents across
dim?
Peak
current 4 times
smaller?
Proceed to choosing
string configuration
No abrupt
change in
current
ratio
?
Non-
identical string
configurations
across
dim?
Yes
Yes
No
No
No fundamental
limitations to using
light engine?
Figure 8. Eliminating Incompatible Light Engines