Diodes AP3615 - Manual (Page 10)

Data Sheet
5 CHANNEL CHARGE PUMP CURRENT SINK FOR LED DRIVER AP3615
Jan. 2013 Rev. 1. 3 BCD Semiconductor Manufacturing Limited
10
Digital Dimming Operating Diagram
Figure 20. Digital Dimming Operating Diagram of AP3615
Note 3: The dimming control can be achieved by applying a pulse to the EN pin. When the low level duration
time of pulse is between T
LOmin
and T
LOmax
, and the high level duration time is larger than T
HImin
, the LED current
will decrease 1/16. If the low level duration time is larger than T
SHDNmax,
the IC will be turned off. When AP3615
is powered on, the WLED is in full brightness. And it will keep maximum current until the pulse is detected.
After 15 pulses the WLED current decreases to 1/16 of full brightness. It will increase to full brightness if a
pulse is added to EN pin then.