MIC4604 datasheet(14/18 Pages) MICREL

14 / 18 page

Micrel, Inc.

MIC4604

June 25, 2013

Revision 1.0

Figure 10. Half Bridge DC Motor

Figure 11. Full Bridge DC Motor

Figure 12. 3-Phase Brushless DC Motor Driver – 24V Block

Diagram

The MIC4604 is offered in a small 2.5mm × 2.5mm TDFN

package for applications that are space constrained and

an SOIC-8 package for ease of manufacturing. The motor

trend is to put the motor control circuit inside the motor

casing, which requires small packaging because of the

size of the motor.

The

MIC4604

offers

low

UVLO

threshold

and

programmable

gate

drive,

which

allows

for

longer

operation time in battery operated motors such as power

hand tools.

Cross conduction across the half bridge can cause

catastrophic failure in a motor application. Engineers

typically add dead time between states that switch

between high input and low input to ensure that the low-

side MOSFET completely turns off before the high-side

MOSFET turns on and vice versa. The dead time depends

on the MOSFET used in the application, but 200ns is

typical for most motor applications.

Power Inverter

Power inverters are used to supply AC loads from a DC

operated battery system, mainly during power failure. The

battery voltage can be 12VDC, 24VDC, or up to 36VDC,

depending on the power requirements. There two popular

conversion methods, Type I and Type II, that convert the

battery energy to AC line voltage (110VAC or 230VAC).

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