LP5891 datasheet(49/69 Pages) TI

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9 Application and Implementation

Note

Information in the following applications sections is not part of the TI component specification,

and TI does not warrant its accuracy or completeness. TI’s customers are responsible for

determining suitability of components for their purposes, as well as validating and testing their design

implementation to confirm system functionality.

9.1 Application Information

The LP5891-Q1 integrates 48 constant current sources and 16 scanning FETs. A single LP5891-Q1 is capable

of driving 16 × 16 RGB LED pixels while stacking two LP5891-Q1 devices can drive 32 × 32 RGB LED pixels. To

achieve low power consumption, the LP5891-Q1 supports separated power supplies for the red, green, and blue

LEDs by its common cathode structure.

The LP5891-Q1 implements a high speed rising edge transmission interface (up to 50 MHz) to support high

device count daisy-chained and high refresh rate while minimizing electrical-magnetic interference (EMI). SCLK

must be continuous, no matter there is data on SIN or not, because SCLK is not only used to sample the data

on SIN, but also used as a clock source to generate GCLK by internal frequency multiplier. Based on rising-edge

CCSI protocol, all the commands/FC registers/SRAM data are written from the SIN input terminal, and all the

FC registers/ LED open and short flag can be read out from the SOUT output terminal. Moreover, the device

supports up to 160-MHz GCLK frequency and can achieve 16-bit PWM resolution, with 3840 Hz or even higher

refresh rate.

Meanwhile, the LP5891-Q1 integrates enhanced circuits and intelligent algorithms to solve the various display

challenges in Narrow Pixel Pitch (NPP) LED display applications and mini and micro-LED products: dim at the

first scan line, upper and downside ghosting, non-uniformity in low grayscale, coupling, caterpillar caused by

open or short LEDs, which make the LP5891-Q1 a perfect choice in such applications.

The LP5891-Q1 also implements LED open, weak short, short detections and removals during operations and

can also report this information out to the accompanying digital processor.

9.2 Typical Application

The LP5891-Q1 are typically connected in series in a daisy-chain to drive the LED matrix with only a

few controller ports. Figure 9-1 shows a typical application diagram with two LP5891-Q1 devices stackable

connection to drive 32 × 32 RGB LED pixels.

LP5891-Q1

VLEDG

...

SIN

SCLK

VCC

SOUT

GND

SIN

SCLK

IREF

VCC

SOUT

GND

IREF

µC

SOUT

SCLK

SIN

VLEDR

VCC

VLEDR

VLEDG/B

...

LP5891-Q1

32 RGBs

VLEDB

VLEDG

VLEDR

VLEDB

...

Red LED

Green LED

Blue LED

Figure 9-1. LP5891-Q1 with Dual Devices Stackable Connection

9.2.1 Design Requirements

Taking 4K micro-LED television for example, the resolution of the screen is 3840 × 2160, and the screen

consists of many modules. The following sections show an example to build a LED display module with 240 ×

180 pixels.

www.ti.com

LP5891-Q1

SNVSC61A – AUGUST 2022 – REVISED DECEMBER 2022

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