White-LED driver backlights LCD and keypad


Posted on Dec 27, 2012

Figure 1 shows a method for driving all the LEDs with a single driver IC from Catalyst Semiconductor (www.catsemi.com), the CAT32. Power comes from a single lithium-ion battery cell. A FET switch can independently turn off the group of six LEDs. The shutdown input, , on the CAT32 turns off all the LEDs. LED brightness is a direct function of the current running through the LED, and typical values are 10 to 20 mA for white LEDs. The CAT32 regulates a constant current through the LED pin. Resistor R1 connected to the RSET pin adjusts the LED current.






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