SLVAFP4 October 2023 TLC59283
TI proposed a scheme to realize time-multiplexing with TLC59283 if there are not enough I/Os in the system to control the transistor, a block diagram similar to Figure 1-1 can be used to drive 64 LEDs. TLC59283 uses eight PNP transistors to switch the common lines and forms a 8-multiplexing scheme. The eight transistors are controlled by the outputs of the TLC59283 so it reduces the I/O count. The more details can be seen in Use TLC59283 for LED Indication with Better Brightness Uniformity, Smaller Size, and Ghosting Elimination.
In the market of smart home appliances, the previous proposed scheme can cause output ringing since the leads are so long to result a relatively large parasitic inductance. This paper proposed a design for the ringing phenomenon and provided the result of simulation and bench test.