LP5860 datasheet(18/56 Pages) TI

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Dev_config1 register, which is default off, the LP5860T supports tphase_shift = 125-ns shifting time shown in Figure

8-4.

• 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 8-4. Phase Shift

To avoid high current sinks output ripple during line switching, current sinks can be configured to turn on with 1

clock delay (62.5ns or 31.25ns according to the PWM frequency) after lines turn on, as shown in Figure 8-3. This

function can be configured by 'CS_ON_Shift' in Dev_config1 register.

The LP5860T 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 LP5860T supports both linear and exponential dimming

curves under 8-bit and 16-bit PWM depth. Figure 8-5 is an example of 8-bit PWM depth.

100 %

80 %

60 %

40 %

20 %

0 %

128

160

192

224

255

PWM_Final (8 bits)

Linear Scale

Exponen al Scale

Figure 8-5. Linear and Exponential Dimming Curves

In summary, the PWM control method is illustrated as Figure 8-6:

LP5860T

SNVSCE1 – MAY 2023

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LP5860 Datasheet(PDF) 18 Page - Texas Instruments