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AN1941 APPLICATION NOTE

4.3 Results:

With a minimum of 8 volts, 1LED can be driven and with the maximum of 25 volts, up to 6 LEDs

can be driven.

Figure 17. Current regulation

The current regulation from 1 to 6 LEDs or 3.3V to 19.5V is ± 1.5%.

Figure 18. Efficiency at 25V input:

The efficiency ranges from 80% to 90% for 2 LEDs or more.

Figure 19. Ripple current

Peak to peak output ripple current is less than 7% of the output current.