A4973 データシートの表示（PDF） - Allegro MicroSystems

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A4973

Full-Bridge PWM Motor Driver

Allegro MicroSystems 

A4973

Full-Bridge PWM Motor Driver

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:

ILOAD = VREF / (RS × 2)

CAUTION: In fast current-decay mode, when the direction of

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

motor and load inertia will be converted into current that charges

the VBB supply bulk capacitance (power supply output and

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.

Soldering Considerations. The lead (Pb) free (100%

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.

BRAKE

REF

PHASE

ENABLE

+5 V

Figure 4 — Typical Application

VBB

www.DataSheet.co.kr

1

VBB

16

2

15

3

14

4

13

LOGIC

5

12

VCC

6

11

7

10

8

VBB

9

47 MF

MODE

Allegro MicroSystems, Inc.

9

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

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