LP5018 datasheet(12/49 Pages) TI1

12 / 49 page

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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

Log_Scale_EN

LP5018, LP5024

SLVSEB8 – MARCH 2018

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Product Folder Links: LP5018 LP5024

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Feature Description (continued)

Figure 5. Logarithmic or Linear Scale Brightness Control

Figure 6. 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 brightness control, the final output PWM duty cycle is defined as the

product obtained by multiplying the color-mixing register value by the related brightness-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 digital dithering control. For 3-bit dithering, every eighth pulse is made 1 LSB longer to

increase the average value by 1 / 8th. The LP50xx device allows 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 LP50xx device sets the PWM switching frequency

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

LP5018 датащи(PDF) 12 Page - Texas Instruments

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