A3950 Просмотр технического описания (PDF) - Allegro MicroSystems

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A3950

DMOS Full-Bridge Motor Driver

Allegro MicroSystems 

Preliminary Data Sheet

Subject to Change without Notice

November 4, 2005

A3950

DMOS Full-Bridge Motor Driver

Ground. A star ground should be located as close to the

A3950 as possible. The copper ground plane directly under

the exposed thermal pad makes a good location for the star

ground point. The exposed pad can be connected to ground

for this purpose.

SENSE Pin. A low value resistor can be placed between

the SENSE pin and ground for current sensing purposes. To

minimize ground-trace IR drops in sensing the output current

level, the current sensing resistor should have an independent

ground return to the star ground point. This trace should be

as short as possible. For low value sense resistors, the IR

drops in the PCB can be significant, and should be taken into

account.

When selecting a value for the sense resistor be sure not to

exceed the maximum voltage on the SENSE pin of ±500 mV.

A3950DS

Terminal List Table

Name Number

Description

NFAULT

1

Fault output, open drain

MODE

2

Logic input

PHASE

3

Logic input for direction control

GND

4

Ground

SLEEP

5

Logic input

ENABLE

6

Logic input

OUTA

7

DMOS full-bridge output A

SENSE

8

Power return

VBB

9

Load supply voltage

OUTB

10 DMOS full-bridge output B

CP1

11 Charge pump capacitor terminal

CP2

12 Charge pump capacitor terminal

GND

13 Ground

VCP

14 Reservoir capacitor terminal

VREG

15 Regulator decoupling terminal

NC

16 No connection

Pad

–

Exposed pad for thermal dissipation

connect to pins 4,13

Allegro MicroSystems, Inc.

8

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

www.allegromicro.com

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