Applications Note AN36
Issue 1 - JULY 2002
LAYOUT CONSIDERATIONS
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.
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.
The capacitors for CLCK and CPWM (C1 and C2
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.
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.
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.
© Zetex plc 2002
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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
AN 36 - 14
ZETEX [ ZETEX SEMICONDUCTORS ]
