| 摘要 |
PROBLEM TO BE SOLVED: To obtain a circuit and the method which speedily drive the H-bridge circuit of a disk drive. SOLUTION: An H-bridge circuit 100 is provided with NMOS transistors(TR) as both upper and lower couples of TRs. An induction head is coupled between the terminals of the TRs. When a logical signal has been received, one of the upper TRs 125 and 165 is driven. The selected upper TRs 125 and 165 to be driven respond to the logical signal. The corresponding lower TRs 145 and 185 are also driven to make a current flow in a 1st direction through the induction head. The driving circuit for the lower TRs 145 and 185 has a programmable circuit, which is constituted by capacitively coupling the output terminal of the driving circuit with a pull-up voltage so as to maximize the quantity of the current forcibly made to flow through the induction head for optimum data transfer.
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