LP5030 datasheet(14/62 Pages) TI2

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LEDx_BRIGHTNESS Register Input

Logarithmic Scale Dimming Curve

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LEDx_BRIGHTNESS Register Input

Linear Scale Dimming Curve

8 Bits Brightness

Brightness Control

Linear OR

Logarithmic

Linear OR

Logarithmic

Log_Scale_EN

LP5030, LP5036

SLVSEH1B – SEPTEMBER 2018 – REVISED JANUARY 2019

www.ti.com

Product Folder Links: LP5030 LP5036

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Feature Description (continued)

Figure 10. Logarithmic or Linear Scale Intensity Control

Figure 11. Logarithmic vs Linear Dimming Curve

8.3.1.3 12-Bit, 29-kHz PWM Generator Per Channel

8.3.1.3.1

PWM Generator

With the inputs of the color mixing and the intensity control, the final output PWM duty cycle is defined as the

product obtained by multiplying the color-mixing register value by the related intensity-control register value. The

final output PWM duty cycle has 12 bits of control accuracy, which is achieved by a 9 bits of pure PWM

resolution and 3 bits of dithering digital control. For 3-bit dithering, every eighth pulse is made 1 LSB longer to

increase the average value by 1 / 8th. The LP503x device allows the users to enable or disable the dithering

function through the PWM_Dithering_EN register. When enabled (default), the output PWM duty-cycle accuracy

is 12 bits. When disabled, the output PWM duty-cycle accuracy is 9 bits.

To eliminate the audible noise due to the PWM switching, the LP503x device sets the PWM switching frequency

at 29-kHz, above the 20-kHz human hearing range.

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