Datasheet

14 Atmel LED Drivers-MSL3163/MSL3164
Figure 6. FBOn Connects to the Power Supply Voltage Divider Through a Diode
Setting the LED String Current with R
ILED
and ISTR
The MSL3163/4 features 16 current sink outputs, rated at 40V, each designed to sink up to 100mA peak. Limit average
current to 60mA if the PCB copper around the MSL3163/4 is the only heat sink employed. The maximum string current,
I
ILED
, for all 16 LED string inputs is set by a single external resistor, R
ILED
, placed from ILED to GND, whose value is determined
using:
ILED
ILED
I
R
762
=
.
For example, a full-scale LED current of 60mA returns R
ILED
= 12.7kΩ. The current for all LED strings is reduced from its full-
scale value with 8-bit resolution using ISTR, the String Current Control register 0x0F.