LP8866S-Q1_V01 datasheet(27/82 Pages) TI

Part #	LP8866S-Q1

Description	LP8866S-Q1 Automotive Display LED-backlight Driver with Six 150-mA Channels

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Manufacturer	TI [Texas Instruments]

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TON

TPWM

PWM

Input

D=100%

D=75%

D=50%

D=25%

D=12.5%

D=6.25%

Phase-shift Mode

D=3.125%

ILED1

DISPLAY_BRT

0xFFFF

0xBFFF

0x7FFF

0x3FFF

0x1FFF

0x0FFF

0x07FF

ILED2

ILED3

ILED4

ILED5

ILED6

LED Dimming Frequency

Figure 7-10. Phase-Shift Dimming Diagram

7.3.8.5 Hybrid Mode

In addition to phase-shift PWM dimming, LP8866S-Q1 supports a hybrid-dimming mode. Hybrid dimming

combines PWM and current modes for brightness control for the display brightness path. By using hybrid

dimming, dimming ratio could be increased by another 8 times. In hybrid mode, PWM dimming is used for low

brightness range of brightness, and current dimming is used for high brightness levels as shown in Figure 7-11.

Current dimming control enables improved optical efficiency due to increased LED efficiency at lower currents.

PWM dimming control at low brightness levels ensures linear and accurate control. Hybrid mode can be selected

through resistor value at MODE pin as Table 7-7. The PWM and current modes transition threshold can be set at

12.5% or at 0% brightness. The latter selection allows for pure current dimming control mode.

www.ti.com

LP8866S-Q1

SNVSBD1A – AUGUST 2020 – REVISED FEBRUARY 2021

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LP8866S-Q1 Datasheet(PDF) 27 Page - Texas Instruments

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