Diodes AP3606/AP3607 - Manual (Page 14)

Data Sheet
4/6 CHANNEL CHARGE PUMP CURRENT SINK FOR LED DRIVER AP3606/AP3607
Jan. 2013 Rev. 1. 5 BCD Semiconductor Manufacturing Limited
14
Digital Dimming Operating Diagram
Figure 32. Digital Dimming Operating Diagram of AP3606/AP3607
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
AP3606/AP3607 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.