Self-adaptive output DC-DC converter and method for satellite-borne radio frequency T assembly

The invention discloses a self-adaptive output DC-DC converter and method for a satellite-borne radio frequency T component. The self-adaptive output DC-DC converter comprises a maximum efficiency point tracker and a DC-DC power converter, the maximum efficiency point tracker comprises a T assembly power amplifier output acquisition circuit, a DC-DC power converter output acquisition circuit, an efficiency calculation circuit and an output control logic unit. The method comprises the following steps of: performing efficiency calculation to obtain an efficiency value eta, determining a reference voltage Vref according to increase and decrease conditions of the efficiency value eta of a current sampling period and a previous sampling period, and enabling an output voltage VTX to track the input reference voltage Vref through voltage closed-loop control of the output voltage VTX, so that a satellite radio frequency T component power amplifier chip can still keep relatively high efficiency during full-power rollb