| 摘要 |
A load, such as a control circuit for a DC/DC converter, is initially operated by an initial load powering voltage developed by a power consuming regulator until another voltage, such as the DC/DC converter's output voltage derived from an input voltage used by the voltage regulator to establish the initial load powering voltage, reaches a predetermined level. A switching control circuit initially allows the regulator to operate and connects its output to the load. The switching control circuit, however, responds to the other voltage so that when this other voltage reaches the predetermined magnitude, the switching control circuit prevents the regulator from further operating and thus from further dissipating energy. The switching control circuit then connects the other voltage to power the load. The switching control circuit is designed so that it dissipates less energy than the regulator when the switching control circuit disables the regulator and allows the other voltage to power the load.
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