| Abstract |
This paper reports about the investigations to integrate a driver IC to operate a sensorless, electronically commutated three phase DC motor with permanent magnets. The drive IC should work at very low supply voltage between 2V and 5V and should deliver a power of up to 4W to the motor. The specifications of such a drive IC are summarized and used for a comparative study of bipolar, standard CMOS and BiCMOS processes. One of the main objectives is the integration of 3 half-bridge circuits comprising 6 transistors each featuring an "on-resistance" Ron of 100 to 150mOhm. Therefore an evaluation chip containing one half-bridge circuit was fabricated in the BiCMOS process. The detailed analysis revealed the first order parameters contributing to the total Ron. which are the active device area, metallization, bond wires and leadframe. |
