MIC4607 Datasheet, PDF (30/42 Pages) Microchip Technology – 85V, Three-Phase MOSFET Driver with Adaptive Dead-Time, Anti-Shoot-Through and Overcurrent Protection

MIC4607
7.0 MOTOR APPLICATIONS
Figure 7-1 illustrates an automotive motor application.
The 12V battery input voltage can see peaks as high as
60V during a load dump event. The 85V-rated MIC4607
drives six MOSFETs that provide power to the BLDC
motor.
A current-sense resistor senses the peak motor cur-
rent. The voltage across this resistor is monitored by
the OC circuit in the MIC4607, which provides overcur-
rent protection for the application. The 120V rating of
the MIC5281 series of LDOs provide input surge volt-
age protection, while regulating the battery voltage
down to 3.3V and 10V – 12V for the microcontroller and
gate driver respectively. This circuit can also be used
for power tool applications, where the battery voltage
carries high-voltage peaks and surges.
Figure 7-2 is a block diagram for a 24V motor drive
application. The regulated 24V bus allows the use of
lower input voltage LDOs, such as the MIC5239-3.3
and MIC5234. This circuit configuration can be used in
industrial applications.
Figure 7-3 illustrates an off-line motor application. Add-
ing an off-line power supply to the front end allow the
MIC4607 to be used in applications such as blenders
and other small white goods as well as ceiling fan appli-
cations. The circuit consists of an MIC38C44 based
AC/DC power supply, that is used to generate 24 VDC
to power a BLDC motor. The MIC4607 drives the six
MOSFETs that provide power to the motor.
The MIC4607 can also be used in low and mid-voltage
inverter applications. Figure 7-4 shows how power
generated by a spinning (or breaking) motor can be
used to generate DC power to a load or provide power
for battery-charging applications.
FIGURE 7-1:
Automotive or Power Tool Application.
DS20005610A-page 30
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