Search FAQs on the left to see if your question has been answered. Click on the dropdown to view all of the documents associated with the product. If you can't find your question, click on Ask a Question

Single Micrel FET MIC4427 driver

When using AC excitation, is it possible to use only one Micrel FET MIC4427


Yes you only need a single MIC4427.
The AD7730  has 2 channels and you need to use both the OUTA and OUTB channels
The upper and lower sections of the bridge are driven via AC and are anti-phase
with each other
(180 degrees different). That is why each end requires an inverter on 1 of the
transistors or FETs so that it is biased to turn on at the correct time.
Two of the FETs are p-channel and the other pair are n-channel.

  • In the datasheet it states that it is possible to do so which just dedicated bridge driver such micrel4427. I

    In Figure 8, transistors Q1 to Q4 perform the switching of the excitation voltage. These transistors can be discrete matched bipolar or MOS transistors-or a dedicated bridge-driver chip such as the 4427 from Micrel can be used to perform the task.

    Is this correct?