| 摘要 |
PROBLEM TO BE SOLVED: To provide an igniter, capable of soft shut off with a small circuit scale.SOLUTION: A voltage comparator 302 compares a voltage V, which corresponds to an ignition signal IGT, to a reference voltage V, and generates a determination signal S. An overvoltage protection element 206 is provided between the gate and the emitter of a power transistor 204. A soft shut off circuit 320 becomes enable state if assert level state of a determination signal Scontinues over predetermined energization protection time T, and in the enable state, the circuit makes output of a driving stage 300B high impedance, and supplies a correction current Ito the gate of the power transistor 204.SELECTED DRAWING: Figure 4 |
