LP5526

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SNVS431D – FEBRUARY 2006 – REVISED MARCH 2013

Vin = 3.6V, Vout = 20.0V if not otherwise stated

Boost Maximum Current

vs.

Output Voltage

Figure 15.

Functionality of Color LED Outputs (RLED, GLED, BLED)

LP5526 has one RGB/color LED output, consisting of three individual LED output pins. Output pins can be used

in switch mode or constant current mode. Output mode can be selected with the control register (address 00H)

bit CC_SW. If the bit is set high, then RGB outputs are in switch mode, otherwise in constant current mode.

These modes are described later in separate chapters.

RGB LED output control can be done in three ways:

1. Defining the expected color and brightness with internal PWM in RGB register (address 01H)

2. Direct setting each LED ON/OFF via RGB Control register (address 00H)

3. External PWM control

BRIGHTNESS CONTROL WITH RGB REGISTER

If the RGB LED output is used by defining the balance and brightness in the RGB register, then one needs to set

EN_RGB bit high and RGB_PWM bit high in the Control register (address 00H). RSW, GSW and BSW are used

to enable each LED output, enabled when written high. CC_SW defines the LED output mode. A single register

is used for defining the color and brightness for the RGB LED output. OVL bit selects overlapping/non-

overlapping mode. Overlapping mode is selected when OVL = 1.

Table 2. CONTROL REGISTER (00H)

Name

Bit

Description

RGB_PWM

7

0 = Internal PWM control disabled

1 = Internal PWM control enabled

EN_RGB

6

0 = RGB outputs disabled

1 = RGB outputs enabled

CC_SW

5

0 = Constant current sink mode

1 = Switch mode

RSW

3

0 = RLED disabled

1 = RLED enabled

GSW

2

0 = GLED disabled

1 = GLED enabled

BSW

1

0 = BLED disabled

1 = BLED enabled

RGB REGISTER (01H)

COLOR[3:0]

7:4

Color for RGB LED output

BRIGHT[2:0]

3:1

Brightness control

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