MIC4607A datasheet(29/41 Pages) MICROCHIP

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DS-20006957A-page 29

MIC4607A

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

MIC4607A 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 MIC4607A, which provides over-

current protection for the application. The 120V rating

of the MIC5281 series of LDOs provide input surge

voltage protection, while regulating the battery voltage

down to 3.3V and 10V to 12V for the microcontroller

and gate driver respectively. This circuit can also be

used for power tool applications, where the battery volt-

age 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

MIC4607A to be used in applications such as blenders

and other white goods as well as ceiling fan applica-

tions. The circuit consists of an MIC38C44 based AC/

DC power supply, that is used to generate 24 VDC to

power a BLDC motor. The MIC4607A drives the six

MOSFETs that provide power to the motor.

The MIC4607A can also be used in low and mid-volt-

age 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.

The MIC4607A can sink as much as 1A, which is

enough current to overcome the MOSFET's input

capacitance and switch the MOSFET up to 50 kHz.

FIGURE 7-1:

Automotive or Power Tool Application.

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