16-bit Constant Current LED Driver with Error Detection

Version:A.004

Page 9

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DM13H-E

Constant-Current Output

Constant-current value of each output channel is set by an external resistor connected

between the REXT pin and GND. Varying the resistor value can adjust the current scale

ranging from 3mA to 90mA. The reference voltage of REXT terminal (Vrext) is

approximately 1.23V. The output current value is calculated by the following equation:

0

10

20

30

40

50

60

70

80

90

12

345

678

9

10

Rext (K)

In order to obtain a good performance of constant-current output, a suitable output voltage

is necessary. Users can get related information about the minimum output voltage below.

0

10

20

30

40

50

60

70

80

90

100

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3

VOUT(V)

Iout (mA) ~

×

65