| 摘要 |
A power voltage supplying apparatus is provided to simplify circuit configuration and to reduce a volume by supplying a DC power voltage through one NPN type bipolar transistor in stead of a low drop output element. A power voltage supplying apparatus(200) includes a DC/DC converter(210), a voltage drop unit(220), and a voltage sensing unit(230). The DC/DC converter generates a first DC power voltage by receiving a DC voltage and generates a drop control voltage(DCV) in proportion to a second feedback DC power voltage. The voltage drop unit outputs the second DC power voltage by consuming the first DC power voltage according to the drop control voltage. The voltage sensing unit senses the second DC power voltage outputted from the voltage drop unit and then feedbacks the second sensed DC power voltage to the DC/DC converter. |
