ZXBM2001 ZETEX | Alldatasheet

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Technical content

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

/c183Built in lock detect protection, rotational speed sensing and automatic recovery /c183Built in Hall amplifier allows direct connection to Hall element /c183PWM Speed control can be implemented via external voltage or resistance (thermistor) input /c183Speed (FG) pulse output – ZXBM2003 /c183Rotor lock output – ZXBM2002 /c183Combined Rotor Lock (RD) and Speed (FG) signal – ZXBM2001 /c183Up to 18V input voltage (60V with external regulator) /c183MSOP10 package

APPLICATIONS

/c183Mainframe and Personal Computer Fans and Blowers /c183Instrumentation Fans /c183Central Heating Blowers /c183Automotive climate control DEVICE MARKING ZXBM2001 - BM21 ZXBM2002 - BM22 ZXBM2003 - BM23 ZXBM2001 ZXBM2002 ZXBM2003 ISSUE 1 - APRIL 2002 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

Parameter Symbol Limits Unit Supply Voltage V CCmax -0.6 to 20 V Input Current I CC 200 mA Power Dissipation P D 500 mW Operating Temp. T OPR -40 to 85 /H11034C Storage Temp. T STG -55 to 125 /H11034C Absolute maximum ratings Parameter Symbol Min Typ Max Unit Conditions Supply Voltage V CC 4.5 18 V Supply Current I CC 2.2 3.25 mA No Load 1 Hall Amp Input Voltage 40 mV diff p-p Hall Amp Common Mode Voltage V CM 0.5 0.5V CC VCC-1.5 V Hall Amp Input Offset V OFS ±7 mV Hall Amp Bias Current V BS -350 nA PH1, PH2 Output High V OH VCC-2.2 V CC-1.8 V I OH = 80mA PH1, PH2 Output Off Leakage Current IOFF /H1100610 /H9262A PH1, PH2 Output Current I OL 80 mA Lock/FG Maximum Collector Voltage VOH VCC V Lock/FG Sink Current I OL 5m A Lock/FG Low Level O/P Voltage V OL 0.3 0.5 V I OL =5 m A CLCK Charge Current I LCKC -1.8 -2.8 /H9262AV in =1 . 5 V CLCK Discharge Current I LCKD 0.28 0.35 /H9262AV in =1 . 5 V Lock condition On:Off ratio 1:7 1:10 C LCK High Threshold Voltage V THH 2.0 V CLCK Low Threshold Voltage V THL 1.0 V CPWM Charge Current I PWMC 3.6 4.3 5.0 /H9262AV in =1 . 5 V CPWM Discharge Current I PWMD 50 62 75 /H9262AV in =1 . 5 V PWM Frequency F PWM 24 kHz C PWM = 0.15nF CPWM High Threshold Voltage V THH 2.0 V CPWM Low Threshold Voltage V THL 1.0 V SPD Voltage Control Range V SPD 12 V 2 SPD Open Circuit Voltage 1.5 V 3 Electrical Characteristics (at Tamb = 25°C & Vcc = 12V) Notes: 1 Measured with pins H+, H-, CLCK and CPWM = 0V and all other signal pins open circuit. 2 The 1V minimum represents 100% PWM drive and 2V represents 0% PWM drive. 3 This voltage is determined by an internal resistor network of 52.5k/H9024from the pin to Gnd and 19.5k/H9024from the pin to a 2V reference. Whilst both resistors track each other the absolute values are subject to a /H1100620% manufacturing tolerance.

Block Diagram (ZXBM2001): Pin Assignments ZXBM2001 ZXBM2002 ZXBM2003 ISSUE 1 - APRIL 2002

Pin Functional Descriptions 1. VCC - Applied voltage This is the device supply voltage. For 5V to 12V fans this can be supplied directly from the Fan Motor supply. 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 The rotor position of the Fan Motor is detected by a Hall 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 device output is attached to the H+ pin whilst the H- pin has an external potential divider attached to hold the pin at half V CC. When H+ is high in relation to H- Ph2 is the active drive. 4. SPD - Speed control voltage input This pin provides control over the Fan Motor speed by varying the Pulse Width Modulated (PWM) drive ratio at the Ph1 and Ph2 outputs. This control signal 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. The pin has an internal potential divider between Gnd and an internal 2.0V reference designed to hold the pin at approximately 1.5V. This will represent a drive of nominally 50%. The addition of a 100k NTC thermistor to ground, for example, will provide a drive nominally 70% at 25°C and 100% at 50°C. If speed control is not required this pin is can be left open circuit for 50% drive or tied to ground by a 10k/H9024 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 V CC 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 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 Locked condition). The pin is an open collector drive, that is there is an active pull down with the high level being provided by an external pull up resistor. Under correct operating conditions, and with this external pull-up in place, this pin will provide an output signal whose frequency will be twice 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 C LCK 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 C LCK pin reaches the VTHH threshold. For the ZXBM2003 variant this pin is FG. This signal is a buffered and inverted output of the Hall signal and therefore provides an output signal whose frequency will be twice that of the rotational frequency of the fan. 7. C LCK - Locked Rotor timing capacitor When in a Locked Rotor condition as described above the Ph1 and Ph2 drive outputs go into a safe drive mode 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) period of 4.0s, giving an On:Off ratio of 1:12. ZXBM2001 ZXBM2002 ZXBM2003 ISSUE 1 - APRIL 2002

Locked Rotor timing capacitor (CONT). The C LCK timing periods are determined by the following equations: T VC I THH LCK LCKC lock = × T VVC I THH THL LCK LCKD off = −×() T VVC I THH THL LCK LCKC on = −×() Where V THH and V THL are the C LCK pin threshold voltages and I LCKC and I LCKD 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: T C I LCK LCKC lock = ×2 T= C I on LCK LCKC T C I LCK LCKD off = 8. CPWM - Sets PWM frequency 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 C LCK timing period (T pwm) is determined by the following equation: T VVC I VVC I THH THL PWM PWMC THH THL PWM PWMD pwm = −× + −×() () Where V THH and V THL are the C PWM pin threshold voltages and I PWMC and I PWMD 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: T C I C I PWM PWMC PWM PWMD pwm =+ 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. Lock Timing Example: Using the equation previously described and to be found under the C LCK pin description: T C I LCK LCKC lock = ×2 T C I LCK LCKC on = T C I LCK LCKD off = Using a value of CLCK = 1.0uF together with the values of I LCKC and I LCKD to be found in the Electrical Characteristics we can derive the following timings for operation at 12V and 25°C. T= 21 . 0 F 2.8 A lock × =/H9262 /H92620 714. s T= 1.0 F 0.28 A off /H9262 /H9262= 36. s T= 21 . 0 F 2.8 A on × =/H9262 /H926203 6. s ZXBM2001 ZXBM2002 ZXBM2003 ISSUE 1 - APRIL 2002 Lock and FG Timing Waveform:

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 collector to Gnd on each 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. Zetex provide a variety of suitable power transistors for 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. ZXBM2001 ZXBM2002 ZXBM2003 ISSUE 1 - APRIL 2002 Bipolar Types V CEO (V) I C (A) min H FE @I C VCE(sat) max (mV) @I C &I B Package FZT1053A 75 4.5 300 @ 0.5A 200@1A,10mA SOT223 FZT851 60 6 100 @ 2A 100@1A,10mA SOT223 ZXT13N50DE6 50 4 300 @ 1A 100@1A,10mA SOT23-6 MOSFET Types BV DSS (V) I D (A) I PEAK (A) (Pulsed) RDS(on) (mW) @V GS Package ZXMN3A04DN8 23 30 7.6 25 20 @ 10V SO8 ZXMN6A09DN8 23 60 5 17.6 45 @ 10V SO8 SUMMARY TABLE OF SUITABLE DEVICES Notes: 1 Contact your nearest Zetex office for further details and technical enquiries.

2 Dual device

3 Provisional information

4 Advanced information

TYPICAL APPLICATION (ZXBM2001) illustrating addition of Clamp diodes.

Oldham, OL9 8NP United Kingdom Telephone (44) 161 622 4422 Fax: (44) 161 622 4420 Zetex GmbH Streitfeldstraße1 9 D-81673 München Germany Telefon: (49) 89 45 49 49 0 Fax: (49) 89 45 49 49 49 Zetex Inc

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Hauppauge, NY11788 USA Telephone: (631) 360 2222 Fax: (631) 360 8222 Zetex (Asia) Ltd 3701-04 Metroplaza, Tower 1 Hing Fong Road Kwai Fong Hong Kong Telephone: (852) 26100 611 Fax: (852) 24250 494 These offices are supported by agents and distributors in major countries world-wide. This publication is issued to provide outline information only which (unless agreed by the Company in writing) may not be used, applied or reproduced 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 reserves the right to alter without notice the specification, design, price or conditions of supply of any product or service. For the latest product information, log on to www.zetex.com © Zetex plc 2002 ZXBM2001 ZXBM2002 ZXBM2003 ISSUE 1 - APRIL 2002 DIM MILLIMETRE MIN. MAX. A 1.10 A1 0.15 A2 0.75 0.95 D 3.00 BSC E 4.90 BSC E1 3.00 BSC b 0.17 0.27 c 0.08 0.23 e 0.50 BSC /H90520/H1103415/H11034 L 0.40 0.80 L1 0.95 BSC PACKAGE DIMENSIONS Conforms to JEDEC MO-187 VARIATION BA