ON

ON

ON

FRAME

50 Ps/20 kHz

RED

GREEN

BLUE

RGB

Ð

RED

25%

GREEN

25%

BLUE

50%

ON

ON

ON

FRAME

50 és/20 kHz

RED

GREEN

BLUE

LP5526

www.ti.com

SNVS431D – FEBRUARY 2006 – REVISED MARCH 2013

Overlapping Mode

In overlapping mode the brightness is controlled using PWM duty cycle based control method as Figure 16

shows.

Figure 16. Overlapping Mode

Since RGB outputs are on simultaneously, the maximum load peak current is:

(1)

Non-Overlapping Mode

The timing diagram shows the split R, G and B and brightness control effect to split parts. Full brightness is used

in the diagram. If for example ½ brightness is used, the frame is still 50µs, but all LED outputs’ ON time is 50%

shorter and at the last 25µs all LED outputs are OFF.

Figure 17. Non-Overlapping Mode

The non-overlapping mode has 16 programmed colors (different R, G and B ratio -> different color). Since the R,

G and B are split into non-overlapping slots the output current through the RGB LED can be calculated with

following equation:

(2)

where

C = Color [%] (see Table 4)

B = Brightness [%] (see Table 3)

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