AL5890

Document number: DS40280 Rev. 2 - 2

8 of 17

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May 2018

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AL5890

Application Information

Description

The AL5890 is a constant current Linear LED driver and can be connected in series with LEDs as a High Side or a Low Side constant current

regulator. The AL5890 offers various current settings from 10mA to 40mA and different current settings available upon request.

Simple LED String (AC/DC Configuration)

The AL5890 can be connected in series with LEDs as a Low Side or High Side constant current regulator. The number of the LEDs can vary

from one to as many as supported by the input supply voltage. The designer needs to calculate the maximum voltage between IN pin and OUT

pin by taking the maximum input voltage less the voltage across the LED string.

(AC Configuration)

Figure 14. Low Side AC Application

Figure 15. High Side AC Application

The AL5890 can also be used at the high side of the IC, see Figure 7. The minimum system input voltage can be calculated by:

(DC Configuration)

Figure 16. Low Side DC Application

Figure 17. High Side DC Application