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TPS543B20 芯片的输出电压调节

Other Parts Discussed in Thread: TPS543B20

TPS543B20 规格书中说明 

Input Voltage Range: 4 V to 19 V

 Output Voltage Range: 0.6 V to 5.5 V

但是没有描述输出电压调节方式,是固定输出的吗? 还是通过哪个引脚来调节(没有找到FB反馈电阻比例调节)。