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OPT3101: OPT3101: 红外LED工作时的电流应该是多少?

Part Number: OPT3101


请问LED发射红外的时候,正常的电流应该是多少?我自己画的板,用的是SFH4550,测得只有20mA。 使用的是OPT3101_SDK里面的INLAB_STEP_0,默认的配置。
然后,再问一下,什么配置或者情况会影响电流。