ZXBM2004 查看數據表（PDF） - Zetex => Diodes

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ZXBM2004

VARIABLE SPEED 2-PHASE BLDC MOTOR CONTROLLER

Zetex => Diodes 

ZXBM2004

As these threshold voltages are nominally set to VTHH = FG - Frequency Generator (speed) output

3V and VTHL = 1V the equations can be simplified as This is the Frequency Generator output and is a

follows:

buffered signal from the Hall sensor.

2C 2C

TPWM = I PWMC + I PWMD

This is an open collector drive giving an active pull

down with the high level being provided by an external

pull up resistor.

CLCK - Locked rotor timing capacitor

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.

Ph1Lo & Ph2Lo - Driver

This pair of outputs drive the external devices. These

outputs provide both the commutation and PWM

waveforms. The outputs are of the Darlington emitter

follower type with an active pull-down to help faster

switch off when using bipolar devices. When in the

high state the outputs will provide up to 80mA of drive

into the base or gates of external transistors as shown

in the Typical Application circuit following.

GND - Ground

This is the device supply ground return pin and will

generally be the most negative supply pin to the fan.

When in the low state the active Phase drive is capable

of sinking up to 16mA when driving low to aid turn off

times during PWM operation. When the Phase is

inactive the output is held low by an internal pull-down

resistor.

RD - Locked Rotor error output

This pin is the Locked Rotor output as referred to in the

CLCK timing section above. It is high when the rotor is

stopped and low when it is running.

V+OP - Phase Outputs Supply Voltage

This pin is the supply to the Phase outputs and will be

connected differently dependant upon external

transistor type.

This is an open collector drive giving an active pull

down with the high level being provided by an external

pull up resistor.

For bipolar devices this pin will be connected by a

resistor to the VCC pin. The resistor is used to control

the current into the transistor base so its value is

chosen accordingly.

For MOSFET devices the pin will connect directly to the

VCC pin.

SEMICONDUCTORS

6

ISSUE 3 - MAY 2005

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