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 TSSOP20 • 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 APPLICATIONS • Mainframe and personal computer fans and blowers • Instrumentation fans • Central heating blowers • Automotive climate control ORDERING INFORMATION DEVICE ZXBM1017ST20TC REEL SIZE TAPE WIDTH QUANTITY PER REEL 13" (330mm) 16mm 2,500 DEVICE MARKING • ZETEX ZXBM1017 Date code ISSUE 4 - MAY 2007 1 ZXBM1017 Absolute Maximum Ratings Parameter Symbol Limits Unit Supply Voltage V CCmax -0.6 to 20 V Input Current I CCmax 200 mA Maximum Input Voltage V Imax -0.6 to Vcc+0.5 V Maximum Output Voltage V Omax -0.6 to Vcc+0.5 V Power Dissipation P Dmax 800 mW Operating Temp. T OPR -40 to 110 °C Storage Temp. T STG -55 to 150 °C and VCC is the maximum application device Supply Voltage 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. and VOH is the minimum High Level Output Voltage for the Ph1Lo and Ph2Lo outputs given in the Electrical Characteristics. 2) Power consumed by the device, PT, can be calculated from the equation: PT = PQ + PPhHi + PPhLo + PTR + PHB + PFGRD PTR is power generated due to the Network Reference source current, given by: where PTR = IOThRef x (VCC - VThRef) and and PQ is power dissipated under quiescent current conditions, given by: PQ = VCC x ICC where IOThRef is the maximum application ThRef output current where Vcc is the maximum application device Supply Voltage and VCC is the maximum application device Supply Voltage and Icc is the maximum Supply Current given in the Electrical Characteristics and VThRef is the Network Reference voltage and PPhHi is power generated due to either one of the phase outputs Ph1Hi or Ph2Hi being active, given by: PHB is power generated due to the Hall Bias source current, given by: PHB = IHB x (VCC - VHB) PPhHi = IOL x VOL where IHB is the maximum application Hall Bias output current where IOL is the maximum application Ph1Hi and Ph2Hi output currents and VHB is the Hall Bias voltage and VOL is the maximum Low Level Output Voltage for the Ph1Hi and Ph2Hi outputs given in the Electrical Characteristics and and PPhLo is power generated due to either one of the phase outputs Ph1Lo or Ph2Lo being active, given by: 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 PPhLo = IOH x (VCC - VOH) where IOL is the maximum application FG or RD output current where IOH is the maximum application Ph1Lo and Ph2Lo output currents and VOL is the FG or RD Low Level Output Voltage ISSUE 4 - MAY 2007 2 ZXBM1017 ⍜j-a = 110°C/W ⍜j-c = 36°C/W ELECTRICAL CHARACTERISTICS (at Tamb = 25°C and Vcc = 12V) PARAMETER SYMBOL MIN. TYP. MAX. UNIT CONDITIONS Supply Voltage V CC 6.7 - 18 V Current I CC - 11 14.5 mA No load (1) diff p-p (3) Hall connections Hall Amp Input Voltage V IN 40 - - mV Hall Amp Common Mode Voltage V CM 0.5 - VCC-1.5 V Hall Amp Input Offset V OFS - ⫾10 - mV Hall Amp Input Current I BS - -400 -650 nA Hall Bias Voltage V HB 1.6 1.75 1.975 V Hall Bias Output Current I HB - - -10 mA I HB OUT = -5mA Output Drives Ph1Lo, Ph2Lo Output High Voltage V OH - V I OH =80mA Phase active Ph1Lo, Ph2Lo Output Low Voltage V OLA - 0.4 0.6 V I OL = 32mA Phase active Ph1Lo, Ph2Lo Output Low Voltage V OLB - 0.4 0.6 V I OL = 50A Phase inactive VCC-2.2 VCC-1.8 Ph1Lo, Ph2Lo Output Source Current I OH - - -80 mA Ph1Lo, Ph2Lo Output Sink Current I OL - - 32 mA Ph1Hi, Ph2Hi Output Low Voltage V OLA - 0.55 0.8 V Ph1Hi, Ph2Hi Output Sink Current I OL - - 100 mA ISSUE 4 - MAY 2007 3 I OL = 100mA ZXBM1017 ELECTRICAL CHARACTERISTICS (at Tamb = 25°C and Vcc = 12V) (Cont.) PARAMETER SYMBOL MIN. TYP. MAX. UNIT CONDITIONS C PWM Charge Current I PWMC -5.3 - -9.1 A PWM Oscillator C PWM Discharge Current I PWMD 55 - 105 A C PWM High Threshold Voltage V THH - 3 - V C PWM Low Threshold Voltage V THL - 1 - V PWM Frequency F PWM 24 kHz C PWM = 0.1nF Reference Voltage ThRef Voltage V ThRef 4.75 5.0 5.25 V ThRef Output Current I OThRef - - -10 mA SPD Voltage Minimum V SPDL - 1 - V 100% PWM Drive SPD Voltage Maximum V SPDH - 3 - V 0% PWM Drive SPD Input Current I ISPD - -0.4 -2 A Vin = 2V I SMIN - -0.25 -0.5 A Vin = 2V C LCK Charge Current I LCKC -2.7 - -5.2 A C LCK Discharge Current I LCKD 0.2 - 0.42 A C LCK High Threshold Voltage V THH - 3 - V C LCK Low Threshold Voltage V THL - 1 - V - 1:12 - I OThRef = -10mA Speed Control Minumum Speed Setting S MIN Input Current Rotor Lock and Auto Restart Lock condition On:Off ratio Current Limit Sense Input Current I Sense - -20 -100 nA Vin = 1V, SetTh = 2V SetTh Input Current I SetTh - -20 -100 nA Vin = 2V, Sense = 1V FG & RD Output Current I OL - - 16 mA FG & RD Low Level Output Voltage V OL - - 0.5 V I OL = 16mA 48 - 112 s ComDel Open Circuit Output Flags Commutation Delay Commutation Delay t ComDel 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 4 - MAY 2007 4 ZXBM1017 Block diagram + Supply Vcc + Supply ThRef Ph1 Hi Vref CPWM Ph2 Hi Phase Drive PWM Osc + Supply V+OP V SPD SPD Vcc Control Voltage Ph1 Lo SMIN Set Min Speed Phase Drive & Control ComDel Vcc Ph2 Lo CLCK ThRef Locked Rotor Detect Sense Current Monitor SetTh Vcc H-Bias Hall Bias FG Speed & Lock Detect H+ Hall H- Hall Amp RD Gnd Pin Assignments 7 ISSUE 4 - MAY 2007 5 ZXBM1017 PIN FUNCTIONAL DESCRIPTION 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. 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. 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. 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. 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. 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. Typical Commutation Delay Resistor to ThRef 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. Delay ( s) 100k⍀ - 28 220k⍀ - 40 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. Resistor to Gnd - - 80 - 470k⍀ 120 - 300k⍀ 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. 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 CPWM timing period (tPWM) is determined by the following equation: t PWM = The advantage of a fixed potential divider is so that the benefit of the current control can be achieved. Where: 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 (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 4 - MAY 2007 6 ZXBM1017 As these threshold voltages are nominally set to VTHH = 3V and VTHL = 1V the equations can be simplified as follows: t PWM = 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. 2C 2C + 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. 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. 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. 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. 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 t off = 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. (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. Where: 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. 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 = 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. 2xC LCK I LCKC 2 xC LCK I LCKC 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. GND - Ground For MOSFET devices the pin will connect directly to the VCC pin This is the device supply ground return pin and will generally be the most negative supply pin to the fan. ISSUE 4 - MAY 2007 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 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 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 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. 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. 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 4 - MAY 2007 8 ZXBM1017 Definitions Product change Zetex Semiconductors reserves the right to alter, without notice, specifications, design, price or conditions of supply of any product or service. Customers are solely responsible for obtaining the latest relevant information before placing orders. Applications disclaimer The circuits in this design/application note are offered as design ideas. It is the responsibility of the user to ensure that the circuit is fit for the user's application and meets with the user's requirements. No representation or warranty is given and no liability whatsoever is assumed by Zetex with respect to the accuracy or use of such information, or infringement of patents or other intellectual property rights arising from such use or otherwise. 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Samples may be available "Active"Product status recommended for new designs "Last time buy (LTB)"Device will be discontinued and last time buy period and delivery is in effect "Not recommended for new designs"Device is still in production to support existing designs and production "Obsolete"Production has been discontinued Datasheet status key: "Draft version"This term denotes a very early datasheet version and contains highly provisional information, which may change in any manner without notice. "Provisional version"This term denotes a pre-release datasheet. It provides a clear indication of anticipated performance. However, changes to the test conditions and specifications may occur, at any time and without notice. "Issue"This term denotes an issued datasheet containing finalized specifications. However, changes to specifications may occur, at any time and without notice. ISSUE 4 - MAY 2007 9 ZXBM1017 PACKAGE OUTLINE - TSSOP20 Controlling dimensions are in millimeters, approximate dimensions are given inches. Conforms to JEDEC MO-153 AC PACKAGE DIMENSIONS Millimeters Inches DIM Millimeters Inches DIM Min Max Min Max A - 1.20 - 0.047 L A1 0.05 0.15 0.002 0.006 e A2 0.80 1.05 0.031 0.041 b 0.19 0.30 0.007 0.012 D 6.4 6.6 0.252 0.260 c 0.09 0.20 0.004 0.008 ⍜ 0° 8° 0° 8° - - - - - E E1 6.40 BSC 4.3 4.5 0.252 BSC 0.169 0.177 Min Max Min Max 0.45 0.75 0.018 0.030 0.65 BSC 0.026 BSC © Zetex Semiconductors plc 2007 Europe Americas Asia Pacific Corporate Headquarters Zetex GmbH Kustermann-Park Balanstraße 59 D-81541 München Germany Telefon: (49) 89 45 49 49 0 Fax: (49) 89 45 49 49 49 [email protected] Zetex Inc 700 Veterans Memorial Hwy Hauppauge, NY 11788 USA Zetex (Asia) Ltd 3701-04 Metroplaza Tower 1 Hing Fong Road, Kwai Fong Hong Kong Zetex Semiconductors plc Zetex Technology Park Chadderton, Oldham, OL9 9LL United Kingdom Telephone: (1) 631 360 2222 Fax: (1) 631 360 8222 [email protected] Telephone: (852) 26100 611 Fax: (852) 24250 494 [email protected] Telephone (44) 161 622 4444 Fax: (44) 161 622 4446 [email protected] ISSUE 4 - MAY 2007 10