| 摘要 |
<p>During a power-up mode of a television receiver power supply, a first run supply voltage (V+) is generated by rectifying a retrace voltage (VW2) in a flyback transformer (T1) of a horizontal output stage (99) of the television receiver. The first voltage (V+) is coupled (through a resistor (R111) and a diode (D2)) to a power supply voltage receiving terminal (120) of a load circuit (998). A voltage regulator (105), typically including a pass transistor (Q3), regulates the voltage at the terminal (120) during both the power-up and standby modes. During the power-up mode, when the ambient temperature is higher than during the standby mode, the current in the transistor (Q3) is lowered, as a result of a current (iR) that is coupled to the terminal (120) via the diode (D2). This reduces the power dissipation in the transistor (Q3) during the power-up mode. Optionally, a second transistor (Q2), having a base electrode that is coupled to the anode of the diode (D2), generates a second, temperature compensated run supply voltage (VRUN) at an emitter electrode of the transistor (Q2).</p> |
