MBI5025 查看數據表（PDF） - Unspecified

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MBI5025

16-bit Constant Current LED Sink Driver

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MBI5025

16-bit Constant Current LED Sink Driver

Application Information

Constant Current

To design LED displays, MBI5025 provides nearly no variations in current from channel to

channel and from IC to IC. This can be achieved by:

1) The maximum current variation between channels is less than ±3%, and that between ICs is

less than ±6%.

2) In addition, the current characteristic of output stage is flat and users can refer to the figure

as shown below. The output current can be kept constant regardless of the variations of LED

forward voltages (Vf). This performs as a perfection of load regulation.

Adjusting Output Current

The output current of each channel (IOUT) is set by an external resistor, Rext. The relationship

between Iout and Rext is shown in the following figure.

60

50

40

30

20

10

0

0

VDS = 1.0V

500

1000

1500

2000

2500

Rext (Ω)

Resistance of the external resistor, Rext, in Ω

Also, the output current can be calculated from the equation:

VR-EXT = 1.26V；IOUT = (VR-EXT / Rext ) x 15

where Rext is the resistance of the external resistor connected to R-EXT terminal and VR-EXT is

the voltage of R-EXT terminal. The magnitude of current (as a function of Rext) is around 30mA

at 620Ω and 15mA at 1260Ω.

- 10 -

January 2004, V0.9

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