LAYOUT CONSIDERATIONS

Whilst it is understandable that the circuit

layout is likely to be severely compromised in

the restricted environment of small 2-Phase

brushless Fan and Blowers a number of

points are worth mentioning.

respectively in all the Figures) need to be

positioned as close to the device as possible

with the latter being the more important. The

decoupling capacitor (C3 in all the Figures)

also needs to be as close to the device as

possible.

As much area as possible should be kept as

copper for the tracks associated with the

output stage and ground rail with the

technique of laying out the gaps rather than

laying out the tracks being preferred.

Allotting as much copper to the tab of the

winding driver transistors is beneficial when

using surface mount packages as they rely

upon the copper of the PCB to dissipate as

much of the heat as possible with the PCB

itself in effect becoming the heatsink.

The power rails to the device and to the

windings should be kept separate where

possible. Where the power comes onto the

PCB it should go in one direction to the

windings and in the other direction to the

controller and its associated components, in

effect to form a star connection.

APPLICATIONS ASSISTANCE

Zetex Applications Engineers have a wealth

of experience in using the ZXBM200n series

of variable speed, 2-phase, DC brushless

motor controllers and are always available to

help with customer applications. Should help

be sought please contact your nearest Zetex

office for assistance.

AN 36 - 14

Applications Note AN36

Issue 1 - JULY 2002

Europe

Zetex plc

Fields New Road

Chadderton

Oldham, OL9 8NP

United Kingdom

Telephone (44) 161 622 4422

Fax: (44) 161 622 4420

uk.sales@zetex.com

Zetex GmbH

Streitfeldstraße 19

D-81673 München

Germany

Telefon: (49) 89 45 49 49 0

Fax: (49) 89 45 49 49 49

europe.sales@zetex.com

Americas

Zetex Inc

700 Veterans Memorial Hwy

Hauppauge, NY11788

USA

Telephone: (631) 360 2222

Fax: (631) 360 8222

usa.sales@zetex.com

Asia Pacific

Zetex (Asia) Ltd

3701-04 Metroplaza, Tower 1

Hing Fong Road

Kwai Fong

Hong Kong

Telephone: (852) 26100 611

Fax: (852) 24250 494

asia.sales@zetex.com

These offices are supported by agents and distributors in major countries world-wide.

This publication is issued to provide outline information only which (unless agreed by the Company in writing) may not be used,

applied or reproduced for any purpose or form part of any order or contract or be regarded as a representation relating to the

products or services concerned. The Company reserves the right to alter without notice the specification, design, price or

conditions of supply of any product or service.

For the latest product information, log on to

www.zetex.com

© Zetex plc 2002