ZXBM1017ST20TC datasheet(7/12 Pages) ZETEX

Part #	ZXBM1017ST20TC

Description	VARIABLE SPEED SINGLE- PHASE BLDC MOTOR CONTROLLER

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Manufacturer	ZETEX [Zetex Semiconductors]

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As these threshold voltages are nominally set to VTHH

= 3V and VTHL = 1V the equations can be simplified as

follows:

t

C

I

C

I

PWM

PWMC

PWMD

=+

22

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.

The frequency at which this takes place is determined

by the value of the capacitor applied to this CLCK pin.

For a 12V supply a value of 1uF will typically provide an

'On' (drive) period of 0.56s and an 'Off' (wait) period of

6.8s, giving an On:Off ratio of 1:12.

The CLCK timing periods are determined by the

following equations:

t

Vx C

I

lock

THH

LCK

LCKC

=

t

VV

x C

I

on

THH

THL

LCK

LCKC

=

−

()

t

VV

x C

I

off

THH

THL

LCK

LCKD

=

−

()

Where:

VTHH and VTHL are the CLCK pin

threshold voltages and

ILCKC and ILCKD are the charge and

discharge currents.

As these threshold voltages are nominally set to VTHH

= 3V and VTHL = 1V the equations can be simplified as

follows:

t

xC

I

lock

LCK

LCKC

=

3

t

xC

I

on

LCK

LCKC

=

2

t

xC

I

off

LCK

LCKC

=

2

GND - Ground

This is the device supply ground return pin and will

generally be the most negative supply pin to the fan.

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.

This is an open collector drive giving an active pull

down with the high level being provided by an external

pull up resistor.

FG - Frequency Generator (speed)

This is the Frequency Generator output and is a

buffered signal from the Hall sensor.

This is an open collector drive giving an active pull

down with the high level being provided by an external

pull up resistor.

Ph1Lo & Ph2Lo - Low-side External H-bridge Driver

These pair of outputs drive the Low side of the external

high power H-bridge devices that in turn drives the

single phase winding. 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 or MOSFET devices with a high gate

capacitance. 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.

When in the low state the active Phase drive is capable

of sinking up to 32mA when driving low to aid turn off

times during PWM operation. When the Phase is

inactive the output is held low by a 7.5k

internal

pull-down resistor.

Ph1Hi & Ph2Hi - High-side External H-bridge Driver

These are the High side outputs to the external

H-bridge and are open collector outputs capable of

sinking 100mA. This signal provides commutation only

to the H-bridge.

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.

For bipolar devices this pin will be connected via 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

ZXBM1017

ISSUE 2 - OCTOBER 2005

7

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