LED照明驱动器 48-channel, 16bit ES PWM LED driver
The TLC5957 is a 48-channel constant current sink driver. Each channel has an individually-adjustable, 65536-step, pulse width modulation PWM grayscale GS brightness control.
The output channels are divided into three groups, each group has a 512 step color brightness control CC, CC adjusts brightness between colors. The maximum current value of all 48 channels can be set by 8-step global brightness control BC. BC adjusts brightness deviation between LED drivers. GS, CC and BC data are accessible via a serial interface port.
TLC5957 has one error flag: LED open detection LOD, which can be read via a serial interface port. Each constant-current has a pre-charge field- effect transistor FET, which can remove ghosting and improve display performance on the multiplexing LED display. Besides, TLC5957 has an enhanced circuit, it can cancel the caterpillar effect caused by LED open.
TLC5957 has a poker data transmission mode; GS data length can be configured from 9 bit to 16 bit according to PWM bits in each sub-segment. Poker Mode can significantly increase visual refresh rate in multiplexing applications.