ZXBM2004 Ver la hoja de datos (PDF) - Diodes Incorporated.

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componentes Descripción

Fabricante

ZXBM2004

TWO PHASE VARIABLE SPEED MOTOR CONTROL PRE-DRIVER

Diodes Incorporated. 

ZXBM2004

TWO PHASE VARIABLE SPEED

MOTOR CONTROL PRE-DRIVER

Functional Description (cont.)

C - Locked Rotor Timing Capacitor

LCK

Should the fan stop rotating for any reason, i.e. an obstruction in the fan blade or a seized bearing, then the device will enter

a Rotor Locked condition. In this condition after a predetermined time (TLOCK) the RD pin will go high and the Phase outputs

will be disabled. After a further delay (TOFF) the controller will re-enable the Phase drive for a defined period (TON) in an

attempt to re-start the fan. This cycle of (TOFF) and (TON) will be repeated indefinitely or until the fan re-starts.

GND – Supply Return

This is the device supply ground return pin and will generally be the most negative supply pin to the fan.

RD - Rotor Lock Detect Output

This pin is the Locked Rotor status output as referred to in the CLCK timing section above. It is high when the rotor is stopped

and low when it is running.

This is an open collector drive giving an active pull down with the high level being provided by an external pull up resistor.

Hall

VTHH

CLCK

VTHL

TLock

RD

FG

TOff

TOn

FR and RD Timing Diagram

ZXBM2004

Document number: DS33433 Rev. 5 - 2

7 of 19

www.diodes.com

February 2012

© Diodes Incorporated

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