| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a driving driver, a driving amplifier and an information apparatus that generate such driving signals as finish transferring energy within a time based on an operating period of switching even near a zero crossing, and implement an originally timed operation of each operational phase for driving a capacitive load according to the driving signals. <P>SOLUTION: A gate driver circuit 23 switches conduction states of PMOS transistors 47, 49 and NMOS transistors 50, 51 when driving signals VCN, VCP are in a range RZ near zero crossing. A piezoelectric speaker driving amplifier 14 thereby switches an operational state from a normal operational state to a zero crossing operational state. Each operational phase for driving a piezoelectric speaker 15 according to the driving signals VCN, VCP can thus be timed on the basis of an original operating period of switching. <P>COPYRIGHT: (C)2013,JPO&INPIT |
