TLC5905

LED DRIVER

SLLS401 – NOVEMBER 1999

21

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

PRINCIPLES OF OPERATION

noise reduction (continued)

0

RIREF – kΩ

10.0

1.0

10

20

30

40

50

60

70

80

0.1

90

90

Conditions : VO = 1 V, V(IREF) = 1.24 V

I

OLC

(mA)

^

V

(IREF)

(V)

R

(IREF)

(k

W)

37

R

(IREF)

(k

W) ^

47

I

O(LC)

(mA)

NOTE: The output current is in 16 bit mode. When in 8 bit mode (MODE=L), the output current is the sum of both outputs. This sum current should

be set from 10 mA to 120 mA. The resistor, R(IREF), should be located as close to the IREF terminal as possible to avoid the noise influence.

Figure 8. Current on Constant Current Output vs External Resistor