| 摘要 |
A DC-DC converter comprises a burst mode circuit configured to work when a load connected to an output terminal of the DC-DC converter is a light load, and a PWM mode circuit configured to work when the load is a heavy load, wherein the burst mode circuit switches a voltage at the output terminal during a period of time when a feedback voltage from the output terminal reaches a high potential reference voltage, generates a switch start signal with frequencies divided by predetermined frequency division values, and switches the voltage at the output terminal in response to the switch start signal, and wherein the PWM mode circuit switches the voltage at the output terminal during a period of time when a ramp wave signal is greater than a difference voltage between the feedback voltage and a predetermined PWM mode reference voltage. |
