| 摘要 |
An electronic device includes a DC-DC converter for voltage conversion in a slave mode an in a master mode and including a phase locked loop. The phase locked loop comprises a controlled oscillator, a filter having an integration capacitor coupled to a control input of the controlled oscillator, a charge pump, and a phase frequency detector. In the slave mode, the controlled oscillator, the filter, the charge pump and the phase frequency detector are coupled to operate as the phase locked loop. There is a comparator coupled with an input to a control input of the controlled oscillator and with an output to the charge pump. In the master mode, the comparator is configured to control the charge pump in response to a control signal at the control input of the controlled oscillator when the phase frequency detector is switched off so as to perform a modulation of the control signal at the control input of the controlled oscillator by charging and discharging the integration capacitor.
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