LED driver circuit

LED driver circuit

CAT3063 LED driver circuit.

The circuit diagram of a three channel LED driver circuit using CAT3063 is shown below (Fig 1). C4 is an input filter capacitor. R1 is the resistor used for programming the output current. C3 is the output filter capacitor. C1 and C2 are the storage capacitors of the internal charge pump circuit.  A logic high at pin 5 will enable the IC and a logic low on the same pin will drive the IC into shutdown mode. In the shutdown mode, the quiescent current is almost equal to zero. With the used value of R1, the LED current per channel will be 25mA.

Selection of R1 is shown in the table below.

LED current (mA)	R1 (kilo ohm)
1	649
5	287
10	102
15	49.9
20	32.4
25	23.7
30	15.4

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