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Semiconductor integrated circuit

  • US 7,310,006 B2
  • Filed: 11/16/2005
  • Issued: 12/18/2007
  • Est. Priority Date: 11/17/2004
  • Status: Expired due to Fees
First Claim
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1. A semiconductor integrated circuit connected between a power supply and an inductive load, comprising:

  • an output transistor controlling current flowing through the inductive load;

    a clamp circuit clamping an overvoltage applied to the output transistor;

    a reference signal generator circuit generating a reference signal by adjusting a level of a control signal input to a control electrode of the output transistor, said reference signal generator circuit comprising one of a time delay function and a hysteresis function; and

    a clamp controlling circuit bringing the clamp circuit into operation based on the reference signal on condition that a counter electromotive force of the inductive load is applied to the output transistor.

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