MIC4607 datasheet(30/42 Pages) MICROCHIP

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MIC4607

DS20005610A-page 30

 2016 Microchip Technology Inc.

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.

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