| 摘要 |
PROBLEM TO BE SOLVED: To provide a D/A conversion device capable of increasing the specification of an output allowable current without increasing the size and cost of the device and improving convenience and reliability.SOLUTION: This D/A conversion device A includes: a D/A converter 2 for converting input digital data to an analog voltage; an operational amplifier OP1 for amplifying the output voltage from the D/A converter 2; an outputting transistor Tr1 for outputting a current in response to the analog output from the operational amplifier OP1; an output-blocking transistor Tr2 for limiting an output current instantaneously flowing to the outputting transistor Tr1 to a value not larger than a predetermined instantaneous maximum allowable current; and a CPU 1 for limiting an output current continuously flowing to the outputting transistor Tr1 to a value not larger than a predetermined continuous maximum allowable current smaller than the instantaneous maximum allowable current. |
