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ZXBM2004

TWO PHASE VARIABLE SPEED MOTOR CONTROL PRE-DRIVER

Diodes Incorporated. 

ZXBM2004

TWO PHASE VARIABLE SPEED

MOTOR CONTROL PRE-DRIVER

Application Note

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 necessary 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.

Fig 1. 12V Typical Circuit for Thermistor Controlled Speed

ZXBM2004

Document number: DS33433 Rev. 5 - 2

9 of 19

www.diodes.com

February 2012

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