AN3981 datasheet(48/54 Pages) STMICROELECTRONICS

48 / 54 page

Common application information

AN3981

48/54

Doc ID 022217 Rev 1

5.6

Higher current requests (outputs in parallel)

When the application needs to drive high power LEDs, the current demand may be higher

than the current provided by a single channel.

In this case a higher current capability can be achieved by connecting together two or more

channels (in accordance with the current value which must be regulated).

Figure 58

shows an example of an STP16CP05 used in an application that requires a 150

mA current driving capability.

As the maximum deliverable current per channel is (for this product) 100 mA, only by

connecting two channels (75 mA per channel) is it possible to reach the requested value of

current.

Figure 58.

High current capability solution

5.7

LED matrix driving solution

The implementation of common anode (or common cathode) configurations in LED matrix

panels allows a reduction in the number of LED drivers. In fact, a matrix of 64 LEDs for

example would require 64 channels (e.g. four 16-channel LED drivers) and an LED common

voltage rail for all anodes. If a multiplexed solution (common anode) is used, just one LED

driver (e.g. STP16xx) is enough, as shown in Figure 59.

AN3981 Datasheet(PDF) 48 Page - STMicroelectronics