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| ZXBM1017 VARIABLE SPEED SINGLE- PHASE BLDC MOTOR CONTROLLER DESCRIPTION The ZXBM1017 is a Single-Phase, DC brushless motor pre-driver with PWM variable speed control and current limit features suitable for fans, blowers and pump motors. Where the system dictates, this device can be controlled via an external voltage, PWM signal or thermistor. FEATURES * Compliant with external PWM speed control * Compliant with thermistor control * Minimum speed setting * Low noise * Auto restart * Built in Hall amplifier * Speed pulse (FG) and lock rotor (RD) outputs * Current Limiting * Variable commutation delay * Up to 18V input voltage (60V with external regulator) * Small TSSOP20 package * Lead free product TSSOP20 APPLICATIONS * Mainframe and personal computer fans and blowers * Instrumentation fans * Central heating blowers * Automotive climate control ORDERING INFORMATION DEVICE REEL SIZE TAPE WIDTH 16mm QUANTITY PER REEL ZXBM1017ST20TC 13" (330mm) 2,500 DEVICE MARKING * ZETEX ZXBM1017 Date code ISSUE 2 - OCTOBER 2005 1 ZXBM1017 Absolute Maximum Ratings Parameter Supply Voltage Input Current Maximum Input Voltage Maximum Output Voltage Power Dissipation Operating Temp. Storage Temp. Symbol V CCmax I CCmax V Imax V Omax P Dmax T OPR T STG Limits -0.6 to 20 200 -0.6 to Vcc+0.5 -0.6 to Vcc+0.5 800 -40 to 110 -55 to 125 Unit V mA V V mW C C 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: and PT = PQ + PPhHi + PPhLo + PTR + PHB + PFGRD where PQ is power dissipated under quiescent current conditions, given by: PQ = VCC x ICC where Vcc is the maximum application device Supply Voltage and Icc is the maximum Supply Current given in the Electrical Characteristics and PPhHi is power generated due to either one of the phase outputs Ph1Hi or Ph2Hi being active, given by: PPhHi = IOL x VOL where IOL is the maximum application Ph1Hi and Ph2Hi output currents and VOL is the maximum Low Level Output Voltage for the Ph1Hi and Ph2Hi outputs given in the Electrical Characteristics and PPhLo is power generated due to either one of the phase outputs Ph1Lo or Ph2Lo being active, given by: PPhLo = IOH x (VCC - VOH) where IOH is the maximum application Ph1Lo and Ph2Lo output currents and and and VCC is the maximum application device Supply Voltage and VOH is the minimum High Level Output Voltage for the Ph1Lo and Ph2Lo outputs given in the Electrical Characteristics. PTR is power generated due to the Network Reference source current, given by: PTR = IOThRef x (VCC - VThRef) where IOThRef is the maximum application ThRef output current and VCC is the maximum application device Supply Voltage and VThRef is the Network Reference voltage PHB is power generated due to the Hall Bias source current, given by: PHB = IHB x (VCC - VHB) where IHB is the maximum application Hall Bias output current and VHB is the Hall Bias voltage PFGRD is power generated due to either or both the Frequency Generator and Locked Rotor Detect outputs being active, given by: PFGRD = IOL x VOL where IOL is the maximum application FG or RD output current and VOL is the FG or RD Low Level Output Voltage ISSUE 2 - OCTOBER 2005 2 ZXBM1017 j-a = 110C/W j-c = 36C/W ELECTRICAL CHARACTERISTICS (at Tamb = 25C and Vcc = 12V) PARAMETER Supply Voltage Current Hall connections Hall Amp Input Voltage Hall Amp Common Mode Voltage Hall Amp Input Offset Hall Amp Input Current Hall Bias Voltage Hall Bias Output Current Output Drives Ph1Lo, Ph2Lo Output High Voltage Ph1Lo, Ph2Lo Output Low Voltage Ph1Lo, Ph2Lo Output Low Voltage Ph1Lo, Ph2Lo Output Source Current Ph1Lo, Ph2Lo Output Sink Current Ph1Hi, Ph2Hi Output Low Voltage Ph1Hi, Ph2Hi Output Sink Current V OH V OLA V OLB I OH I OL V OLA I OL VCC-2.2 VCC-1.8 0.4 0.4 0.55 0.6 0.6 -80 32 0.8 100 V V V mA mA V mA I OL = 100mA I OH =80mA Phase active I OL = 32mA Phase active I OL = 50 A Phase inactive V IN V CM V OFS I BS V HB I HB 40 0.5 1.6 10 -400 1.75 VCC-1.5 -650 1.975 -10 mV V mV nA V mA I HB OUT = -5mA diff p-p V CC I CC 4.7 11 18 14.5 V mA No load (1) SYMBOL MIN. TYP. MAX. UNIT CONDITIONS ISSUE 2 - OCTOBER 2005 3 ZXBM1017 ELECTRICAL CHARACTERISTICS (at Tamb = 25C and Vcc = 12V) (Cont.) PARAMETER PWM Oscillator C PWM Charge Current C PWM Discharge Current C PWM High Threshold Voltage C PWM Low Threshold Voltage PWM Frequency Reference Voltage ThRef Voltage ThRef Output Current Speed Control SPD Voltage Minimum SPD Voltage Maximum SPD Input Current Minumum Speed Setting S MIN Input Current Rotor Lock and Auto Restart C LCK Charge Current C LCK Discharge Current C LCK High Threshold Voltage C LCK Low Threshold Voltage Lock condition On:Off ratio Current Limit Sense Input Current SetTh Input Current Output Flags FG & RD Output Current FG & RD Low Level Output Voltage Commutation Delay Commutation Delay t ComDel 48 112 s ComDel Open Circuit I OL V OL 16 0.5 mA V I OL = 16mA I Sense I SetTh -20 -20 -100 -100 nA nA Vin = 1V, SetTh = 2V Vin = 2V, Sense = 1V I LCKC I LCKD V THH V THL -2.7 0.2 3 1 1:12 -5.2 0.42 A A V V I SMIN -0.25 -0.5 A Vin = 2V V SPDL V SPDH I ISPD 1 3 -0.4 -2 V V A 100% PWM Drive 0% PWM Drive Vin = 2V V ThRef I OThRef 4.75 5.0 5.25 -10 V mA I OThRef = -10mA I PWMC I PWMD V THH V THL F PWM -5.3 55 3 1 24 -9.1 105 A A V V kHz C PWM = 0.1nF SYMBOL MIN. TYP. MAX. UNIT CONDITIONS Notes: (1.) Measured with pins H+, H-, CLCK and CPWM = 0V and all other signal pins open circuit. (2.) In this data sheet a negative sign for a current indicates current flowing out of the pin whilst no sign indicates current flowing into the pin ISSUE 2 - OCTOBER 2005 4 ZXBM1017 Block diagram + Supply Vcc ThRef Vref CPWM PWM Osc Phase Drive + Supply Ph1 Hi Ph2 Hi + Supply V+OP V SPD Control Voltage SMIN SPD Vcc Ph1 Lo Set Min Speed ComDel Phase Drive & Control Vcc Ph2 Lo Locked Rotor Detect ThRef Sense CLCK Current Monitor H-Bias Hall Bias SetTh Vcc FG H+ Hall H- Hall Amp Gnd Speed & Lock Detect RD Pin Assignments 7 ISSUE 2 - OCTOBER 2005 5 ZXBM1017 PIN FUNCTIONAL DESCRIPTION H+ - Positive Hall input H- - Negative Hall input The rotor position is detected by a Hall sensor, with the output applied to the H+ and H- pins. This sensor can be either a 4 pin 'naked' Hall device or of the 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 buffered Hall sensor the Hall device output is attached to the H+ pin, with a pull-up attached if needed, whilst the H- 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. H-Bias- Hall Bias Output This is a 1.75V nominal voltage source to bias a differential unbufferred Hall sensor when that type is used. ThRef - Network Reference This is a reference voltage of nominal 5V and is used by external networks to set up the SPD and SMIN pins control voltages. It is designed for the ability to 'source' current and therefore it will not 'sink' any current from a higher voltage. The current drawn from the pin by the minimum speed potential divider to pin SMIN and any voltage setting network on the SPD pin should not exceed 10mA in total. SPD - Speed Control Input The voltage applied to the SPD pin provides control over the Fan Motor speed by varying the Pulse Width Modulated (PWM) drive ratio at the Ph1Lo and Ph2Lo outputs. The control signal takes the form of a voltage input of range 3V to 1V, representing 0% to 100% drive respectively. If variable speed control is not required this pin can be left with an external potential divider to set a fixed speed or tied to ground to provide full speed i.e. 100% PWM drive. The advantage of a fixed potential divider is so that the benefit of the current control can be achieved. If required this pin can also be used as a disable pin. The application of a voltage >3.0V will force the PWM drive fully off, in effect disabling the drive. SMIN - Sets Minimum Speed A voltage can be set on this pin via a potential divider between the ThRef and Gnd. This voltage is monitored by the SPD pin such that the SPD voltage cannot rise above the SMIN Voltage. As a higher voltage on the SPD pin represents a lower speed it therefore restricts the lower speed range of the fan. If this feature is not required the pin is left tied to ThRef so no minimum speed will be set. If the fan is being controlled from an external voltage source either this feature should not be used or if it is required then a >1k resistor should be placed in series with the SPD pin. ComDel - Adjusts the Commutation Delay The ZXBM1017 has a fixed internal commutation delay of 100us, however, there may be cases where this needs to be adjusted to a different value. A resistor can be attached to this pin to enable the delay to be lengthened or shortened dependant upon application. A resistor applied between the ComDel pin and Gnd will lengthen the delay and a resistor applied between the ComDel pin and ThRef will shorthen the delay. The following Table indicates the delay expected for a given resistor value. Typical Commutation Delay Resistor to ThRef 100k 220k Resistor to Gnd 470k 300k Delay ( s) 28 40 80 120 168 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 0.1nF will provide a PWM frequency of typically 24kHz. The CPWM timing period (tPWM) is determined by the following equation: t PWM = Where: (V THH -V THL )xC (V THH -V THL )xC + I PWMC I PWMD C = CPWM +15, in pF VTHH and VTHL are the CPWM pin threshold voltages IPWMC and IPWMD are the charge and discharge currents in A. tPWM is in s ISSUE 2 - OCTOBER 2005 6 ZXBM1017 As these threshold voltages are nominally set to VTHH = 3V and VTHL = 1V the equations can be simplified as follows: 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 t PWM = 2C 2C + I PWMC I PWMD 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 C LCK timing periods are determined by the following equations: t lock = t on = V THH xC LCK I LCKC (V THH -V THL )xC LCK I LCKC (V THH -V THL )xC LCK I LCKD VTHH and VTHL are the CLCK pin threshold voltages and ILCKC and ILCKD are the charge and discharge currents. t off = Where: As these threshold voltages are nominally set to VTHH = 3V and VTHL = 1V the equations can be simplified as follows: t lock = t off = 3 xC LCK I LCKC t on = 2xC LCK I LCKC 2 xC LCK I LCKC GND - Ground This is the device supply ground return pin and will generally be the most negative supply pin to the fan. ISSUE 2 - OCTOBER 2005 7 ZXBM1017 VCC - Applied Voltage This is the device internal circuitry 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. SetTh - Set Threshold Voltage The ZXBM1015 contains a current monitor circuit used to sense the current flowing in the motor winding and this pin is used to control how the circuit responds to that current. The device works in a threshold feedback mode using a potential divider to the Set Threshold pin. This potential divider is used to set a voltage that will be compared with the voltage generated by the current in a Sense resistor attached in the Low-Side ground return of the external H-Bridge driver. When the current in the Sense resistor, and thus the voltage, rises above the SetTh pin threshold the controller will back-off the PWM drive to limit the maximum current taken by the motor. To do this the current monitor will internally apply a correction signal to the SPD pin. If the motor current is below the set threshold the controller does not influence the SPD voltage. A suitable voltage range for the SetTh pin, and thus the sensed voltage on the Sense pin, would be 50mV to 200mV. It should be noted that the effectiveness of the control is determined by the external network used to control the SPD pin. It will not work where the fan is being controlled by a low source impedance voltage. If the fan is being controlled from an external voltage source then a resistor >1k should be placed in series with the SPD pin. The minimum speed setting on the SMIN pin will override the current limit feature. A current cannot be set that is lower than the current taken when the motor stalls at minimum speed. Sense This pin is used by the current sensing circuit, as described above, to monitor the current taken by the motor windings. The signal comes from a sense resistor in the Low-Side ground return of the external H-Bridge driver. ISSUE 2 - OCTOBER 2005 8 ZXBM1017 NOTES: ISSUE 2 - OCTOBER 2005 9 ZXBM1017 NOTES: ISSUE 2 - OCTOBER 2005 10 ZXBM1017 NOTES: ISSUE 2 - OCTOBER 2005 11 ZXBM1017 PACKAGE OUTLINE - TSSOP20 Controlling dimensions are in millimeters, approximate dimensions are given inches. Conforms to JEDEC MO-153 AC PACKAGE DIMENSIONS Millimeters DIM Min A A1 A2 D E E1 0.05 0.80 6.4 Max 1.20 0.15 1.05 6.6 Min 0.002 0.031 0.252 Max 0.047 0.006 0.041 0.260 L e b c Inches DIM Min 0.45 Max 0.75 Min 0.018 Max 0.030 Millimeters Inches 0.65 BSC 0.19 0.09 0 0.30 0.20 8 - 0.026 BSC 0.007 0.004 0 0.012 0.008 8 - 6.40 BSC 4.3 4.5 0.252 BSC 0.169 0.177 - - (c) Zetex Semiconductors plc 2005 Europe Zetex GmbH Streitfeldstrae 19 D-81673 Munchen 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 Headquarters Zetex Semiconductors plc Zetex Technology Park Chadderton, Oldham, OL9 9LL 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. 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 ISSUE 2 - OCTOBER 2005 12 |
Price & Availability of ZXBM1017ST20TC
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