| 摘要 |
PROBLEM TO BE SOLVED: To maintain the operation of an overcurrent preventing circuit. SOLUTION: When a power voltage VCC drops, a reference voltage Vref2 inputted to a voltage amplifier OP2 drops. Then the output of the voltage amplifier OP2 rises, the current quantities of transistors Q1 and Q2 decrease, and the output voltage of a transistor QA drops, Consequently, the output voltage VOUT applied to a current amplifier OP3 drops, so the current amplifier OP3 is able to operate regardless of the drop in the power voltage VCC.
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