Semiconductor integrated circuit device

Details Semiconductor integrated circuit device Semiconductor integrated circuit device

1993-11-16

1995-06-27

Shoop, Jr., William M.

Electricity: motive power systems

Open-loop stepping motor control systems

318254, 318439, 363 60, H22P 602

Patent

active

054282810

ABSTRACT:
A semiconductor integrated circuit device incorporates a voltage step-up (boost) circuit which produces a stepped-up (boosted) voltage higher than the power voltage based on a periodic pulse signal generated internally or supplied from the outside. The stepped-up voltage is supplied to the emitter of a pnp driving transistor that produces a drive current for the output transistor on the voltage source side which is the one of a pair of npn output transistors in push-pull configuration. The voltage step-up circuit has its current supply capacity varied in response to the current flowing through the output transistor or driving transistor.

REFERENCES:
patent: 4870332 (1989-09-01), Coghran et al.
patent: 5030897 (1991-07-01), Ohtani et al.
patent: 5208518 (1993-05-01), Grapenthin et al.
patent: 5363028 (1994-11-01), Mori

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