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NCP5890
PWM Sequence
The three PWM can be controlled according to one of the
possible sequence depicted in Figure 17. In all cases, the
Main Display is powered first.
Strategy #1 : the three PWM are fully synchronized and
share the same timings, the rise and fall time being
identical. At this point, the feedback voltage will rapidly
swap from a low 400 mV (normal operation) to the large Vf
span coming from the three LED added in series.
Strategy #2 : the three PWM share the same rise and fall
time, the sequence being synchronized but delayed until
Main Display
PWM1
the previous LED is at full power (PWM = 100%). This is
the most stable sequence, from a human eye stand point,
since we have a minimum blinking (one Vf variation only).
Strategy #3 : the three PWM share the same rise and fall
time but they can be activated independently.
Startegy#4 : the three PWM operate randomly: the
NCP5890 is capable of operating under such conditions,
but care must be observed since such random PWM (as
depicted by the circles) might be a stress from a human eye
stand point.
Strategy #1
Strategy #2
Strategy #3
Strategy #4
PWM2
PWM3
PWM1
PWM2
PWM3
PWM1
PWM2
PWM3
PWM1
PWM2
PWM3
Figure 17. Basic PWM Sequences
http://onsemi.com
16
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