ML4428IP datasheet(12/16 Pages) MICRO-LINEAR

12 / 16 page

ML4428

OUTPUT DRIVERS

The P-channel drivers are emitter follower type with 5mA

pull down currents. The N-channel drivers are totem pole

with a 1200ý resistor in series with the pull up device.

Crossover comparators are employed with each driver

pair, eliminating the potential of crossover, and hence,

shoot-through currents.

BRAKING

When BRAKE is pulled low all 3 P-channel drivers will be

turned off and all 3 N-channel drivers will be turned on.

POWER FAIL

In the event of a power fail, i.e. VCC falls below 8.75V all

6 output drivers will be turned off.

HIGHER VOLTAGE MOTOR DRIVE

The ML4428 can be used to drive higher voltage motors

by means of level shifters to the high side drive transistors.

This can be accomplished by using dedicated high side

drivers for applications greater than 80V or a simple NPN

level shift as shown in Figure 9 for applications below

80V. Figure 10 shows how to interface to the IR2118, high

side drivers from I.R. This allows driving motors up to

600V. The BRAKE pin can be pulsed prior to startup with

an RC circuit. This charges the bootstrap capacitors for

three inexpensive high side drivers

ML4428IP Datasheet(PDF) 12 Page - Micro Linear Corporation