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LP8866S-Q1 Datasheet(PDF) 29 Page - Texas Instruments |
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LP8866S-Q1 Datasheet(HTML) 29 Page - Texas Instruments |
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29 / 82 page  Brightness Brightness Time Time Sloper Input Sloper Output Slope Time Linear Slope Advanced Slope Figure 7-13. Brightness Sloper 7.3.8.8 PWM Detector Hysteresis PWM detector has an internal hysteresis function. It means when PWM input is used (except direct PWM mode), PWM output duty cycle will change only when PWM input on-time changes by more than 6.4us. This is to avoid the PWM duty cycle sampling error due to the onboard PWM signal's rising/falling time. 7.3.8.9 Dither The number of brightness steps when using LED output PWM dimming is equal to the 20-MHz oscillator frequency divided by the LED PWM frequency (set by PWM_FSET resistor). The PWM duty cycle dither is a function the LP8866S-Q1 uses to increase the number of brightness dimming steps beyond this oscillator clock limitation. The dither function modulates the LED driver output duty cycle over time to create more possible average brightness levels. The DITHER_SELECT[3:0] register bits control the level of dither, disabled, 1, 2, 3 or 4 bits using the I2C interface. By default the dither is disabled. When the 1-bit dither is selected, to support higher brightness resolution, the width of every second PWM pulse could be increased by one LSB (one 20-MHz clock period). When the 3-bit dither is selected, within a sequence of 8 PWM periods the number of pulses with increased length varies depending on the dither value: dither value 000 - all 8 pulses at default length; 001 - one of the 8 pulses is longer; 010 - two of the 8 pulses are longer, and so forth, until at 111 - seven of the 8 pulses have increased length. Figure 7-14 shows one example of PWM output dither. www.ti.com LP8866S-Q1 SNVSBD1A – AUGUST 2020 – REVISED FEBRUARY 2021 Copyright © 2021 Texas Instruments Incorporated Submit Document Feedback 29 Product Folder Links: LP8866S-Q1 |
Similar Part No. - LP8866S-Q1_V01 |
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Similar Description - LP8866S-Q1_V01 |
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