ZXBM2004(2005) データシートの表示（PDF） - Diodes Incorporated.

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ZXBM2004
(Rev.:2005)

VARIABLE SPEED 2-PHASE BLDC MOTOR CONTROLLER

Diodes Incorporated. 

VCC - Applied Voltage

This is the device internal circuitry supply voltage. For

5V to 12V fans this can be supplied directly from the

Fan Motor supply. For fans likely to run in excess of the

18V maximum rating for the device this will be

supplied from an external regulator such as a Zener

diode.

RD Timing Waveform:

Hall

VTHH

C LCK

VTHL

TLock

RD

FG

TOff

TOn

ZXBM2004

Applications Information

The ZXBM2004 is primarily controlled by a voltage on

the SPD pin. A voltage of 1V represents a 100% PWM at

the Phase Outputs and in turn represents full speed. 3V

on the SPD pin conversely represents 0% PWM. The

motor can therefore be controlled simply by applying a

control voltage onto the SPD pin with the minimal use

of external components.

This voltage control method easily lends itself to

control by other signal types. For example if a

thermistor is applied to the SPD pin a varying voltage

can be generated at the SPD pin as the resistance of the

thermistor varies with temperature.

A common form of control of fans is by a PWM signal

derived from a central processor or controller. This

signal can be converted into a voltage and that voltage

adjusted as neccesary to compensate for motor none

linearity, inclusion of the Minimum speed feature etc.

Full applications details and further examples of how

to control the ZXBM2004 are available in the

Applications Notes AN41, AN42 and AN43.

ISSUE 3 - MAY 2005

7

SEMICONDUCTORS

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