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TLC5916-Q1: 芯片电流输出不了最大设计值

Part Number: TLC59116-Q1

您好

REXT=160Ω, Iout_target=117mA,设计采用了8个芯片级联,每路控制一颗灯珠,8颗芯片总共控制128颗灯

实测时发现:

亮1颗灯珠,PWM=100%,灯珠电流只有108mA

亮60颗灯珠,PWM=100%,上述那颗灯珠只有102mA

亮128颗时,PWM=100%,上述那颗灯珠只有102mA

需要您协助分析下,为什么达不到设计能力117mA,而且随着亮的灯珠数量增加,电流是在降低的