LP5030 datasheet(15/62 Pages) TI2

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Phase 1

Phase 2

Phase 3

Cycle Time

Phase 1

Phase 2

Phase 3

LED1

LED4

LED[3× (n-1)+1]

LED0

LED3

LED[3× (n-1)]

LED2

LED5

LED[3× (n-1)+2]

LP5030, LP5036

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SLVSEH1B – SEPTEMBER 2018 – REVISED JANUARY 2019

Product Folder Links: LP5030 LP5036

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Feature Description (continued)

8.3.1.4 PWM Phase-Shifting

A PWM phase-shifting scheme allows delaying the time when each LED driver is active. When the LED drivers

are not activated simultaneously, the peak load current from the pre-stage power supply is significantly

decreased. The scheme also reduces input-current ripple and ceramic-capacitor audible ringing. LED drivers are

grouped into three different phases.

•

Phase 1—the rising edge of the PWM pulse is fixed. The falling edge of the pulse is changed when the duty

cycle changes. Phase 1 is applied to LED0, LED3, …, LED[3 × (n – 1)].

•

Phase 2—the middle point of the PWM pulse is fixed. The pulse spreads in both directions when the PWM

duty cycle is increased. Phase 2 is applied to LED1, LED4, …, LED[3 × (n – 1) + 1].

•

Phase 3—the falling edge of the PWM pulse is fixed. The rising edge of the pulse is changed when the duty

cycle changes. Phase 3 is applied to LED2, LED5, …, LED[3 × (n – 1) + 2].

•

For LP5030, n = 10. For LP5036, n = 12.

Figure 12. PWM Phase-Shifting

8.3.2 LED Bank Control

For most LED-animation effects, like blinking and breathing, all the RGB LEDs have the same lighting pattern.

Instead of controlling the individual LED separately, which occupies the microcontroller resources heavily, the

LP503x device provides an easy coding approach, the LED bank control.

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