| 摘要 |
PURPOSE:To provide the constant voltage circuit capable of driving with the lower voltage such as nickel-cadmium battery and outputting the stable voltage whose temperature is compensated. CONSTITUTION:The constant voltage circuit is provided with a battery 1, band- gap type/current mirror type constant current source circuit 3 outputting corrector current IC9 of transistor Q9 having the positive temperature coefficient, current source circuit 5 outputting corrector current IC8 of transistor Q8 having the negative temperature coefficient described by base-to-emitter voltage VBEQ7 of transistor Q7, and load resistance element R0. In node NO, the corrector current IC9 and the corrector current IC8 are added. The temperature coefficients of both current are cancelled, and the current in the node NO is independent of temperature. Load resistance element R0 converts the current into voltage and outputs as voltage Vout. |
