Cirrus Logic AN374 - Manual (Page 19)

AN374
AN374REV2 19
Figure 9 shows a way for selecting the correct second stage string configuration.
Yes
No
Yes
No
Yes
No
Provide completed light
engine design across
dim and temperature
Not compatible
No hard limitations to
using either
string configuration
Start
Parallel string
configuration
Series string
configuration
Currents
cross at
any dim?
Voltage
Same?
Voltage
same?
Yes
No
Flyback topology. Series
and parallel string
configurations are sufficient
Buck?
Proceed to selecting
the topology
The series string
configuration has
higher efficiency
Figure 9. Selecting the Correct Second Stage String Configuration