| 摘要 |
PROBLEM TO BE SOLVED: To provide a drive circuit for driving multiple constant current drive elements over a wide temperature range. SOLUTION: A control part 1 calculates a drive voltage Ve at present temperature from a detection result of a temperature detection part 5 and data of the drive voltage Ve of constant current drive elements 21-2n at the respective temperatures, which are kept in a storage part 7, and outputs an adjusting signal to a voltage adjust part 6, so that the difference between applied voltage Vdd' and drive voltage Ve becomes almost constant at the respective temperatures. The voltage adjust part 6 is positioned between a power terminal 3 and a drive part 4 and adjusts the application voltage Vdd' applied to the drive part 4 by the adjusting signal from the control part 1, based on the peripheral temperature. |
