16-bit Constant Current LED Driver with Error Detection

Version:A.006

Page 10

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DM13C

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 5mA to

90mA. The reference voltage of REXT terminal (Vrext) is approximately 1.2V. The output current

value is calculated roughly by the following equation:

Iout(mA)

5

10

20

30

40

50

60

70

80

90

M

46.4

45.9

45

44.5

44.2

44.3

44.9

43.7

42.3

42.7

Output Current as a Function of Rrext Value

0

10

20

30

40

50

60

70

80

90

100

0

1

2

3

4

5

6

7

8

9

10

11

12

Rrext(KOhm)

Output Current as a Function of Output Voltage

0

10

20

30

40

50

60

70

80

90

100

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

1.8

2

2.2

2.4

2.6

2.8

3

Vout (V)

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 above.

Iout (mA) ~

Ω )

× M