ZXBM2001X10TA - DIODES INC - Datasheet.Directory

SEMICONDUCTORS

DESCRIPTION

The ZXBM200x is a series of 2-phase, DC brushless motor pre-drivers with PWM

variable speed control suitable for fan and blower motors.

FEATURES

·Built in lock detect protection, rotational speed sensing and automatic recovery

·Built in Hall amplifier allows direct connection to Hall element

·PWM Speed control via

- External voltage

- Thermistor input

- External PWM source

·Speed (FG) pulse output – ZXBM2003

·Rotor lock output – ZXBM2002

·Combined Rotor Lock (RD) and Speed (FG) signal – ZXBM2001

·Up to 18V input voltage (60V with external regulator)

·MSOP10 package

APPLICATIONS

·Mainframe and Personal Computer Fans and Blowers

·Instrumentation Fans

·Central Heating Blowers

·Automotive climate control

DEVICE MARKING

ZXBM2001 or BM21

ZXBM2002 or BM22

ZXBM2003 or BM23

ZXBM2001

ZXBM2002 ZXBM2003

ISSUE 4 - OCTOBER 2004

VARIABLE SPEED 2-PHASE FAN MOTOR CONTROLLER

DEVICE REEL SIZE TAPE WIDTH QUANTITY PER REEL

ZXBM200xX10TA 7” (180mm) 12mm 1,000

ZXBM200xX10TC 13” (330mm) 12mm 4,000

ORDERING INFORMATION

Example: ZXBM2001X10TA

ZXBM2001

ZXBM2002 ZXBM2003

SEMICONDUCTORS

ISSUE 4 - OCTOBER 2004

Parameter Symbol Limits Unit

Supply Voltage VCCmax -0.6 to 20 V

Input Current ICCmax 200 mA

Power Dissipation 25°C PDmax 500 mW

Operating Temp. TOPR -40 to 85 ⬚C

Storage Temp. TSTG -55 to 150 ⬚C

Absolute maximum ratings

Power Dissipation

1) Maximum allowable Power Dissipation, PD,

is shown plotted against Ambient Temperature,

TA, in the accompanying Power Derating Curve,

indicating the Safe Operating Area for the device.

2)Power consumed by the device, PT, can be

calculated from the equation:

PT= PQ+ PPh

where PQis power dissipated under quiescent

current conditions, given by:

PQ= VCC x ICC

where VCC is the application

device Supply Voltage

and ICC is the maximum Supply

Current given in the Electrical

Characteristics

and PPh is power generated due to either one of

the phase outputs Ph1 or Ph2 being

active, given by:

PPh = IOL x VOL

where IOL is the application Ph1 and Ph2

output currents

and VOL is the maximum Low Level

Output Voltage for the Ph1 and

Ph2 outputs given in the Electrical

Characteristics

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SEMICONDUCTORS

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Parameter Symbol Min Typ Max Unit Conditions

Supply Voltage VCC 4.5 18 V

Supply Current ICC 2.2 3.25 mA No Load 1

Hall Amp Input Voltage 40 mV diff p-p

Hall Amp Common Mode Voltage VCM 0.5 0.5VCC VCC-1.5 V

Hall Amp Input Offset VOFS ±7 mV

Hall Amp Bias Current VBS -350 nA

PH1, PH2 Output High VOH VCC-2.2 VCC-1.8 V IOH = 80mA

PH1, PH2 Output Off Leakage

Current IOFF ⫾10 ␮A

PH1, PH2 Output Current High IOH -80 mA

Lock/FG Maximum Collector

Voltage VOH VCC V

Lock/FG Sink Current IOL 5mA

Lock/FG Low Level O/P Voltage VOL 0.3 0.5 V IOL = 5mA

CLCK Charge Current ILCKC -1.8 -2.8 ␮AV

in = 1.5V

CLCK Discharge Current ILCKD 0.28 0.35 ␮AV

in = 1.5V

Lock condition On:Off ratio 1:7 1:10

CLCK High Threshold Voltage VTHH 2.0 V

CLCK Low Threshold Voltage VTHL 1.0 V

CPWM Charge Current IPWMC 3.6 4.3 5.0 ␮AV

in = 1.5V

CPWM Discharge Current IPWMD 50 62 75 ␮AV

in = 1.5V

PWM Frequency FPWM 24

34 kHz

kHz CPWM = 150pF

CPWM = 100pF

CPWM High Threshold Voltage VTHH 2.0 V

CPWM Low Threshold Voltage VTHL 1.0 V

SPD Voltage Control Range VSPD 12V2

SPD Open Circuit Voltage 1.5 V 3

Electrical Characteristics (at Tamb = 25°C & VCC = 12V)

Notes:

1Measured with pins H+, H-, CLCK and CPWM = 0V and all other signal pins open circuit.

2The 1V minimum represents 100% PWM drive and 2V represents 0% PWM drive.

3This voltage is determined by an internal resistor network of 52.5k⍀from the pin to Gnd and 19.5k⍀from the pin to a 2V reference. Whilst both

resistors track each other the absolute values are subject to a ±20% manufacturing tolerance

Block Diagram (ZXBM2001):

Pin Assignments

Pin Functional Descriptions

1. VCC - Applied voltage

Thisisthedevicesupplyvoltage.For5Vto12Vfansthis

canbesupplieddirectlyfromtheFanMotorsupply.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.

2. H+ - Hall input

3. H- - Hall input

TherotorpositionoftheFanMotorisdetectedbyaHall

sensor whose output is applied to these pins. This

sensor can be either a 4 pin ‘naked’ Hall device or a 3

pin buffered switching type. For a 4 pin device the

differential Hall output signal is connected to the H+

and H- pins. For a 3 pin buffered Hall sensor the Hall

deviceoutput is attached to the H+ pinwhilsttheH- pin

has an external potential divider attached to hold the

pin at half VCC. When H+ is high in relation to H- Ph2 is

the active drive.

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SEMICONDUCTORS

ISSUE 4 - OCTOBER 2004

Top View

4. SPD - Speed control voltage input

This pin provides control over the Fan Motor speed by

varying the Pulse Width Modulated (PWM) drive ratio

atthe Ph1 andPh2outputs. This controlsignal can take

the form of either a voltage input of nominal range 2V

to 1V, representing 0% to 100% drive respectively, or

alternatively a thermistor can be attached to this pin to

control the voltage. A third method of speed control is

available by the application of an externally derived

PWM signal and this will be discussed under the CPWM

pin.

This pin has an internal potential divider between an

internal 2.0V reference and Gnd (see Block Diagram)

designed to hold the pin at approximately 1.5V. This

will represent a drive of nominally 50% PWM. For

thermal speed control a 100k NTC thermistor is

connected between the SPD and ground will provide a

drive nominally 70% at 25°C and 100% at 50°C. As the

thermistor is connected in parallel with the internal

resistor the non-linearity of an NTC thermistor is

largely taken out. A linearity of typically ±2.5% is

achievable.

Lower values of thermistor can be used if needed and

in this situation an external potential divider will be

neededtosetthespeedrange.Thiswilltaketheformof

a resistor from the SPD pint to Vcc and a resistor from

the SPD pin to Gnd. Full details are given in the

ZXBM200x series Application Note.

If speed control is not required this pin is can be left

open circuit for 50% drive or tied to ground by a 10k⍀

resistor to provide 100% drive.

If required this pin can also be used as an enable pin.

The application of a voltage of 2.0V to VCC will to force

the PWM drive fully off, in effect disabling the drive.

5. GND - Ground

This is the device supply ground return pin and will

generally be the most negative supply pin to the fan.

6. LOCK/FG - Locked Rotor error output /

Frequency Generator (speed) output

This pin is an open collector output and so will require

an external pull up resistor for correct operation.

On the ZXBM2001 the Lock/FG pin is designed to be a

dual function pin to provide an indication of the Fans

rotational speed together with an indication of when

the Fan has failed rotating for whatever reason (Rotor

Lockedcondition). Undercorrect operatingconditions,

and with the external pull-up in place, this pin will

provideanoutputsignal whosefrequencywillbetwice

that of the rotational frequency of the fan. Should the

fan itself 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 the Lock/FG pin will go high (regardless of

the state of the Hall sensor) when the CLCK pin reaches

the VTHH threshold and will remain high until the fan

blades start rotating again.

On the ZXBM2002 variant this pin is Lock. During

normal operation the signal will be low and during a

Locked Rotor condition the pin will go high when the

CLCK pin reaches the VTHH threshold.

FortheZXBM2003variantthispinisFG.Thissignalisa

buffered and inverted output of the Hall signal and

therefore provides an output signal whose frequency

willbetwicethatoftherotationalfrequencyofthefan.

7. CLCK - Locked Rotor timing capacitor

When in a Locked Rotor condition as described above

thePh1andPh2driveoutputsgointoasafedrivemode

to protect the external drive devices and the motor

windings. This condition consists of driving the motor

for a short period then waiting for a longer period

before trying again. The frequency at which this takes

place is determined by the size of the capacitor applied

to this CLCK pin. For a 12V supply a value of 1.0uF will

typically provide an ‘On’ (drive) period of 0.33s and an

‘Off’(wait)periodof4.0s,givinganOn:Offratioof1:12.

The CLCK timing periods are determined by the

following equations:

TVC

THH LCK

LCKC

lock =

×TVVC

THH THL LCK

LCKD

off =

−×()

TVVC

THH THL LCK

LCKC

on =

−×()

Where VTHH and VTHL are the CLCK pin threshold

voltages and ILCKC and ILCKD are the charge and

discharge currents.

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SEMICONDUCTORS

ISSUE 4 - OCTOBER 2004

Locked Rotor timing capacitor (CONT).

As these threshold voltages are nominally set to

VTHH=2V and VTHL=1V the equations can be simplified

as follows:

ILCK

LCKC

lock =

×2T=

on LCK

LCKC TC

ILCK

LCKD

off =

8. CPWM - Sets PWM frequency

- external PWM input

This pin has an external capacitor attached to set the

PWM frequency for the Phase drive outputs. A

capacitor value of 0.15nF will provide a PWM

frequency of typically 24kHz.

The CLCK timing period (Tpwm) is determined by the

following equation:

(V - V ) C

I(V V ) C

lock THH THL

PWMC

THH THL

PWMD

−×

Where TPWM is in ␮s

C = CPWM +15 in pF

IPWM &I

PWMD are in ␮A

Where VTHH and VTHL are the CPWM pin threshold

voltages and IPWMC and IPWMD are the charge and

discharge currents.

As these threshold voltages are nominally set to

VTHH=2V and VTHL=1V the equations can be simplified

as follows:

PWM PWMC PWMD

The CPWM pin can also be used as in input for an

externally derived PWM signal to control the motor

speed. The signal should have a VOL <1V and a VOH

>2V. A standard TTL or CMOS digital signal is ideal.

When driving from an external PWM source no

capacitor should be attached to the CPWM pin and the

SPD pin should be left open circuit.

9. PH2 - External transistor driver

10. PH1 - External transistor driver

These are the Phase drive outputs and are open

darlington emitter followers designed to provide up to

80mA of drive to external transistors as shown in the

Application circuits following. The external transistors

in turn drive the fan motor windings.

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SEMICONDUCTORS

ISSUE 4 - OCTOBER 2004

Lock & FG Timing Waveform:

Lock Timing Example:

Using the equation previously described and to be

found under the CLCK pin description:

ILCK

LCKC

lock =

×2TC

ILCK

LCKC

on =TC

ILCK

LCKD

off =

Using a value of CLCK = 1.0uF together with the values

of ILCKC and ILCKD to be found in the Electrical

Characteristics we can derive the following timings for

operation at 12V and 25°C.

21.0F

2.8 A

lock

␮

␮0714.sT=

1.0 F

0.28 A

off ␮

␮=36.

21.0F

2.8 A

␮

␮036.

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SEMICONDUCTORS

ISSUE 4 - OCTOBER 2004

Figure 1

TYPICAL APPLICATION (ZXBM2001) using Bipolar power transistors

Figure 2

TYPICAL APPLICATION (ZXBM2001) using MOSFET power transistors

Graph 1

APPLICATION INFORMATION

Thissectiongivesabriefinsightintoapplicationsusing

the ZXBM200x series. More complete data is available

in the ZXBM200x Series Applications Note, visit

www.zetex.com/zxbm or contact your nearest Zetex

office for full details.

The ZXBM200x series of 2-phase DC brushless motor

pre-drivers are capable of driving both Bipolar or

MOSFET power transistors.

For smaller fans and blowers it is likely that bipolar

power transistors would be used as shown in the

following Applications circuit.

InFigure1,R1&R2havetheirvalueselectedtoprovide

suitable base current in keeping with the winding

currentandgainofthepowertransistorsQ1&Q2.R3&

R4 have their value selected to provide efficient

switch-off of Q1 & Q2. The Zener diodes ZD1 & ZD2

provideactiveclampinginconjunctionwithQ1&Q2.

It is also recommended that the supply de-coupling

capacitor C3 is positioned as close as is practical to the

ZXBM device pins.

In the case of higher power fans and blowers it may be

more applicable to use MOSFET devices to switch the

windings as illustrated in the second applications

circuit shown in Figure 2.

In Figure 2, the Resistor ratio of R1 to R3 and R2 to R4

provide the required Gate turn-on voltage whilst the

absolute values will be chosen to provide sufficient

gate switching currents.

Also illustrated in the two Applications circuits above

are the methods of connection for both a ‘naked’ Hall

device, as seen in the bipolar circuit in Figure 1, and a

bufferedHall device, as in theMOSFETcircuit in Figure

2.InthislattercircuitR5&R6biastheH-pinatavoltage

equivalent to half the swing of the Hall device. R7 will

be needed if the buffered Hall device does not have its

own internal pull-up.

Graph 1 below, illustrates the PWM drive waveform

takenfromandapplication usingtheMOSFETcircuitin

Figure 2. This shows the waveforms to be found at the

Ph1 output and at the drain/Winding node.

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SEMICONDUCTORS

ISSUE 4 - OCTOBER 2004

When driving fans with bipolar transistors, at higher

voltages it may be necessary to provide extra noise

protection by the addition of a diode from the driver

collectortoGndoneach phase. This prevents negative

voltage excursions from the windings affecting

operation. See Figure 3 right, showing the placement

of these diodes. It should be noted that these are not

required for the MOSFET solution in Figure 2 as the

diodes are inherent in the MOSFET structure.

Zetexprovideavarietyofsuitablepowertransistorsfor

using with the ZXBM200x series of 2-phase DC

brushless motor pre-drivers and suitable devices

sufficient for a range of applications are given in the

following table.

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SEMICONDUCTORS

ISSUE 4 - OCTOBER 2004

Figure 3

TYPICAL APPLICATION (ZXBM2001) illustrating addition of Clamp

diodes.

Bipolar Types VCEO (V) IC(A) min HFE @I

CVCE(sat) max(mV)

C&I

Package

FZT1053A 75 4.5 300 @ 0.5A 200 @ 1A, 10mA SOT223

FZT851 60 6 100 @ 2A 100 @ 1A, 10mA SOT223

FZT853 100 6 100 @ 2A 175 @ 1A, 100mA SOT223

FZT855 150 4 100 @ 1A 65 @ 0.5A, 50mA SOT223

ZXT13N50DE6 50 4 300 @ 1A 100 @ 1A, 10mA SOT23-6

SUMMARY TABLE OF SUITABLE DEVICES

MOSFET Types BVDSS (V) ID(A) IPEAK (A)

(Pulsed)

RDS(on) max(m )

Package

ZXMN3A04DN823 30 7.6 25 20 @ 10V SO8

ZXMN6A09DN823 60 5 17.6 45 @ 10V SO8

ZXMN6A11Z160 3.8 10 140 @ 10V SOT89

ZXMN6A11G 60 3.8 10 140 @ 10V SOT223

ZXMN10A11G24 100 1.9 5.9 600 @ 10V SOT223

Notes:

1Contact your nearest Zetex office for further details and technical enquiries.

2Dual device

3Provisional information

4Advanced information

ZXBM2001

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SEMICONDUCTORS

ISSUE 4 - OCTOBER 2004

Europe

Zetex GmbH

Streitfeldstraße 19

D-81673 München

Germany

Telefon: (49) 89 45 49 49 0

Fax: (49) 89 45 49 49 49

europe.sales@zetex.com

Americas

Zetex Inc

700 Veterans Memorial Hwy

Hauppauge, NY 11788

USA

Telephone: (1) 631 360 2222

Fax: (1) 631 360 8222

usa.sales@zetex.com

Asia Pacific

Zetex (Asia) Ltd

3701-04 Metroplaza Tower 1

Hing Fong Road, Kwai Fong

Hong Kong

Telephone: (852) 26100 611

Fax: (852) 24250 494

asia.sales@zetex.com

Corporate Headquaters

Zetex Semiconductors plc

Lansdowne Road, Chadderton

Oldham, OL9 9TY

United Kingdom

Telephone (44) 161 622 4444

Fax: (44) 161 622 4446

hq@zetex.com

These offices are supported by agents and distributors in major countries world-wide.

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for any purpose or form part of any order or contract or be regarded as a representation relating to the products or services concerned. The Company

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For the latest product information, log on to www.zetex.com

DIM MILLIMETERS INCHES

MIN. MAX. MIN. MAX.

Aᎏ1.10 ᎏ0.43

A1 ᎏ0.15 ᎏ0.006

A2 0.75 0.95 0.0295 0.037

D 3.00 BSC 0.118 BSC

E 4.90 BSC 0.1929 BSC

E1 3.00 BSC 0.118 BSC

b 0.17 0.27 0.0066 0.0106

c 0.08 0.23 0.003 0.009

e 0.50 BSC 0.0196 BSC

⍜0⬚15⬚0⬚15⬚

L 0.40 0.80 0.015 0.031

L1 0.95 BSC 0.037 BSC

PACKAGE DIMENSIONSPACKAGE OUTLINE

Conforms to JEDEC MO-187 VARIATION BA

CONTROLING DIMENSIONS IN METRIC

APPROX. DIMENSION IN INCHES