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TPS61165关于外部PWM调光如何计算LED电流

TPS61165 dvr_3_hi_lvs790.gif

目前输入电压为12V,屏的标称电流为240mA,标称电压为27.9V。

问题1:如图外部pwm调光部分的LED current是如何计算出来的?

问题2:PWM的频率和上拉的电压有什么要求?