Full-Bridge PWM Motor Driver

A4973

9

Allegro MicroSystems, Inc.

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

ensure that the maximum ratings of the device are not exceeded.

If the internal fast current-decay control circuitry is used, then the

load current will regulate to a value given by:

the motor is changed abruptly, the kinetic energy stored in the

motor and load inertia will be converted into current that charges

decoupling capacitance). Care must be taken to ensure that the

capacitance is sufficient to absorb the energy without exceeding

the voltage rating of any devices connected to the motor supply.

See also the Brake Operation section, above.

matte tin) plating on lead terminations is 100% backward-

compatible for use with traditional tin-lead solders of any

composition, at any temperature of soldering that has been

traditionally used for that tin-lead solder alloy. Further, 100%

matte tin finishes solder well with tin-lead solders even at

temperatures below 232°C. This is because the matte tin dissolves

easily in the tin-lead. Additional information on soldering is

available on the Allegro Web site, www.allegromicro.com.

Figure 4 — Typical Application

LOGIC

47

F

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

V

BB

MODE

PHASE

ENABLE

BRAKE

+5 V

REF