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如何加大PWM信号驱动电流?

Other Parts Discussed in Thread: DRV8837

MCU的一个GPIO口输出的3.3 V的PWM信号,芯片本身驱动电流最大只有20mA,现在需要驱动80个光耦,每个光耦需要10mA 电流,请问有什么放大器可以将PWM信号驱动电流增至800mA,电压不用放大,保持3.3V即可?