TLC5904

LED DRIVER

SLLS391 – NOVEMBER 1999

21

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

PRINCIPLES OF OPERATION

constant output current

0

RIREF – kΩ

10.0

1.0

10

20

30

40

50

60

70

80

0.1

90

NOTE: Conditions: VOUT = 1.0V, VIREF = 1.24V

I

OLC(mA)

V

IREF(V)

R

IREF(kW)

37

≅

R

IREF (kW)

47

I

OLC(mA)

≅

NOTE: Shows the output current at the 16 bit mode. and at the 8 bit mode (MODE=L). Output current is the sum of both outputs. This sum current

should be set from 10 mA to 120 mA. The resistor, RIREF, 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