| 摘要 |
There is provided a dead time control method capable of recognizing a critical situation in which a commutating transistor cannot be turned on because of a temporary variation in an output voltage of a synchronous rectifying DC-DC converter and adaptively preventing the commutating transistor from being turned on. The synchronous rectifying DC-DC converter compares an output Voff of an error amplifier with a voltage Vt obtained by multiplying the peak voltage of a ramp by G2. When Voff becomes greater than or equal to Vt, the converter determines that dead time is insufficient to control the switching of the commutating transistor and prevents the commutating transistor from being turned on. |
