LP5860RKPR datasheet(14/71 Pages) TI

14 / 71 page

A PWM phase-shifting scheme is implemented in each current sink to avoid the current overshot when turning

on simultaneously. As the LED drivers are not activated simultaneously, the peak load current from the pre-stage

power supply is significantly decreased. This scheme also reduces input-current ripple and ceramic-capacitor

audible ringing. LED drivers are grouped into three different phases. By configuring the 'PWM_Phase_Shift' in

Dev_config1 register, which is default off, the LP5861T supports tphase_shift = 125-ns shifting time shown in Figure

8-1.

• Phase 1: CS0, CS3, CS6, CS9, CS12, CS15

• Phase 2: CS1, CS4, CS7, CS10, CS13, CS16

• Phase 3: CS2, CS5, CS8, CS11, CS14, CS17

Phase 1

Phase 2

Phase 3

Phase Shi

Figure 8-1. Phase Shift

• Low Brightness Compensation: three groups compensation are implemented to overcome the color-

shift and non-uniformity in low brightness conditions. The compensation capability can be through

'Comp_Group1', 'Comp_Group2', and 'Comp_Group3' in Dev_config2 register.

– Compensation_group 1: CS0, CS3, CS6, CS9, CS12, CS15

– Compensation_group 2: CS1, CS4, CS7, CS10, CS13, CS16

– Compensation_group 3: CS2, CS5, CS8, CS11, CS14, CS17

The LP5861T allows users to configure the dimming scale either exponentially (Gamma Correction) or linearly

through the 'PWM_Scale_Mode' in Dev_config1 register. If a human-eye-friendly dimming curve is desired, using

the internal fixed exponential scale is an easy approach. If a special dimming curve is desired, using the linear

scale with software correction is recommended. The LP5861T supports both linear and exponential dimming

curves under 8-bit and 16-bit PWM depth. Figure 8-2 is an example of 8-bit PWM depth.

LP5861T

SNVSCE4 – MAY 2023

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LP5860RKPR датащи(PDF) 14 Page - Texas Instruments