| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem that switches using many group III nitrides suitable for power application as a base material are always kept to be ON when there exists no gate signal. SOLUTION: In a buck converter circuit in which at least one of the control switch and the synchronous switch is a group III nitride depletion mode, an enhancement mode switch is connected with at least one of the switches using the group III nitride as the base material, and is operated to prevent current conduction by the switch using the group III nitride as the base material, until all biases are established for proper operation. COPYRIGHT: (C)2008,JPO&INPIT
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