MAX16824_09 Datasheet, PDF (10/13 Pages) Maxim Integrated Products – High-Voltage, Three-Channel Linear High-Brightness LED Drivers

High-Voltage, Three-Channel Linear
High-Brightness LED Drivers
LE
CLK
DIN
DOUT
t_CH
t_CL
t_CP
50%
50%
50%
t_DH
t_DS
50%
DO
50%
D1
50%
t_LS
50%
t_LW
50%
D2
t_DO
50%
DO
t_OEW
OE
50%
50%
OUT_
t_OEL
t_F
t_OEH
80%
20%
t_R
Figure 3. 4-Wire Serial-Interface Timing Diagram
data. Holding OE low allows the output channels to fol-
low the state of the output latches. The duty cycle
depends on LE’s frequency. All output channels are
affected at the same time.
Another method of pulse dimming the outputs is to hold
LE high and drive OE with a PWM signal. Because the
input bits are always latched, the serial input constantly
refreshes the register. The control bits must be carefully
selected to dim the outputs properly.
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