AAT3128ITO-T1 datasheet(9/13 Pages) ANALOGICTECH

Part #	AAT3128ITO-T1

Description	RGB LED Fashion Lighting Controller

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Manufacturer	ANALOGICTECH [Advanced Analogic Technologies]

Direct Link	http://www.analogictech.com

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Application Information

R

SET Selection

The maximum output current for current sources

ISRC1 and ISRC2 is programmed by the R

SET

resistor. A nominal value of 38.3k

Ω will set each

current source output to 60mA each. Lower maxi-

mum current levels may be programmed by reduc-

ing the value of R

SET.

Refer to Table 3 for R

SET

resistor values to set the maximum brightness con-

stant current rounded off to the closest 1% value.

Table 3: R

SET Programming Values.

If a desired current source output level is not listed

in Table 3, the R

SET resistor value may be calculat-

ed using the following formula:

Where:

V

REF = 1.2V

I

OUT = Desired output current for ISRC1 and

ISRC2 (ISRC1 = ISRC2

≤ 60mA)

RGB LED Selection

The AAT3128 is specifically intended for driving

RGB color LEDs. However, the device design will

allow the AAT3128 to drive most types of LEDs with

forward voltage specifications ranging from 1.0V to

5.0V. The two current sink outputs provide up to

60mA each and may be paralleled to drive high-

current LEDs up to 120mA without complication.

Most RGB color LEDs have greatly varied forward

voltage specifications for each red, green and blue

LED for a given forward current operating condition.

Refer to Figure 2 or the datasheet for a given RGB

LED to be used with the AAT3128. Since the ISRC1

and ISRC2 output current sources are matched with

negligible voltage dependence, RGB LED bright-

ness and color will be matched regardless of specif-

ic LED forward voltage (V

F) variations.

Figure 2: Typical RGB LED Forward Voltage

vs. Forward Current Characteristics.

Forward Voltage (VF ) (V)

0.00

0.01

0.02

0.03

0.04

0.05

0.06

0.07

0.08

1.00

1.50

2.00

2.50

3.00

3.50

4.00

R

SET =

(1920 · V

REF)

I

OUT

Current Source

Output (mA)

R

SET Value (kΩ)

60

38.3

50

46.6

40

57.6

30

76.8

20

115

10

232

AAT3128

RGB LED Fashion Lighting Controller

3128.2007.09.1.0

9

EN/SET Timing

Figure 1: S

2Cwire Timing Diagram.

EN/SET

Code

1

2

3

OFF

t

HI

t

LO

t

OFF

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