| 摘要 |
A DC-DC converter arrangement is provided, for example for use in a display driver (4) of an active matrix liquid crystal display. The arrangement comprises a DC-DC converter (36) which has an input (CK1) for receiving an energising signal. A selecting circuit (40), which may be a multiplexer, selects between supplying a system clock signal (SCK) to the converter (36) when the system clock signal (SCK) is active and an output signal (OCSK) from an oscillator (38) when the system clock signal (SCK) is inactive. When the system clock signal (SCK) is active, the oscillator (38) is disabled. This saves power and prevents the need to have the system clock running all the time. |
