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ASL5015FHN 数据表(PDF) 14 Page - NXP Semiconductors

部件名 ASL5015FHN
功能描述  Matrix LED Controller (MLC)
PDF  69 Pages
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制造商  NXP [NXP Semiconductors]
网页  http://www.nxp.com
标志 NXP - NXP Semiconductors

ASL5015FHN 数据表(HTML) 14 Page - NXP Semiconductors

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NXP Semiconductors
ASL5xxxyHz
Matrix LED Controller (MLC)
ASL5xxxyHz
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2019. All rights reserved.
Product data sheet
Rev. 2.1 — 5 February 2019
14 / 69
of 4.1 ms/4096 = 1 µs , at 244 Hz or 0.5 µs, at 488 Hz. The resolution in terms of PWM
percentage is 0.024 %. This resolution ensures very smooth LED dimming to very low
light levels.
When a PWM switch turns on, the forward voltage of the whole string decreases with the
Vf of one LED. During the negative slope, there could be a high discharge current from
the string capacitor that also flows through the entire LED string. If more than one LED is
bypassed at the same time, then this injected current is higher when additional LEDs are
bypassed. Therefore, it is desired to close only one switch at a time. For that reason, the
MLC incorporates an internal phase-shifting module that ensures closing switches one at
a time.
Note: Automated phase shifting feature is applicable to all Matrix LED controllers part
numbers.
Figure 7 shows a phase-shifting example in an MLC IC, during just one PWM cycle.
Figure 7. Built in phase shifting
sequence



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