ZXBM1021 SINGLE PHASE VARIABLE SPEED MOTOR CONTROL PRE-DRIVER Pin Assignments The ZXBM1021 is a high performance, low noise, single-phase, VCC For system flexibility the motor speed can be controlled by either an H+ H- speed control and current control suitable for fan and blower motors. Ph2Hi (Top View) Direct Current Brushless (BLDC) motor pre-driver with variable PWM V+OP Description external PWM control signal or by a DC voltage signal from an external control voltage or from a Thermistor network. HBIAS Ph1Lo To prevent motor inrush current the device has a soft start feature. To ThRef Ph2Lo help protect the motor coil, the ZXBM1021 provides rotor lock PWMSPD protection which shuts down the output drive if rotor lock is detected. ZXBM1021 Ph1Hi SPD SetThRef The device automatically re-starts with soft-start when the rotor lock is CSPD removed. The ZXBM1021 monitors the motor current to provide a Sense Frequency Generator (FG) pin which allows external interface to monitor motor rotation or speed. SetTh FG GND A Tachometer output is provided by the open collector output CLCK SMIN programmable over current limit. U-QFN4040-20 The FG output is the magnetic change frequency. (Top View) The ZXBM1021 is available in space saving and low profile U-QFN4040-20 and industry standard QSOP-20 packages. Vcc Features Operating voltage: 6.8V to 18V Can be extended with external regulator 1 20 V+OP H+ Ph2Hi H- Ph1Lo HBIAS Ph2Lo ThRef Ph1Hi ZXBM1021 SetThRef Speed control via external PWM, DC or Thermistor signals Low noise, high efficiency SPD Soft start CSPD SetTh Integrated current control SMIN FG Reference voltage output CLCK Built-in Hall amplifier for direct connection of Hall element Rotor Lock Protection PWMSPD Sense 11 10 GND QSOP-20 Lock detection, output shutdown and automatic re-start Minimum speed setting Frequency generator (FG) output Applications Thermally enhanced space saving low profile U-QFN4040-20 and Personal, servers and mainframe computers cooling fans industry standard QSOP-20 packages Instrumentation and equipment cooling fans Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Home appliance fans and blowers Halogen and Antimony Free. "Green" Device (Note 3) Central heating blowers and extraction systems Industrial fans, blower and extractors Hand dryers Hand-held power tools Pumps Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. 2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated's definitions of Halogen- and Antimony-free, "Green" and Lead-free. 3. Halogen- and Antimony-free "Green" products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and <1000ppm antimony compounds. ZXBM1021 Document number: DS36322 Rev. 2 - 2 1 of 25 www.diodes.com April 2014 (c) Diodes Incorporated ZXBM1021 Typical Applications Circuit (Note 4) D2 12V R12 VCC C1 1F Hall 1N4004 (Optional) D1 1N4148 Ph2Hi R5 H- Ph1Lo 100 R1 HBIAS Ph2Lo ThRef Ph1Hi ZXBM1021 R9 12k 0.1F 5&6 470 R2 7&8 470 R3 W1 4 R4 1k 5&6 C5 7&8 2.2F 2 2 100 SPD R7 Sense 33k CSPD SetTh 1 FG CLCK R10 16k 4 3 Q1-4 ZXMC 3A17DN8 SetThRef SMIN C2 R6 1k H+ PWMSPD PWM control 3 V+OP 1 R8 470 GND Rsense 0.1 C4 C3 0.1uF 0.47F FG 0V Typical Applications Circuit for PWM Control using the ZXBM1021 and ZXMC MOSFET 1/2 Bridge Drivers D2 12V R12 D1 1N4148 VCC C1 1F Hall 1N4004 (Optional) Ph2Hi R5 H- Ph1Lo 100 R1 HBIAS Ph2Lo ThRef Ph1Hi ZXBM1021 R11 10k R9 12k C2 0.1F 4 470 R3 7&8 W1 4 R4 1k 5&6 C5 7&8 2.2F 2 2 100 SetThRef R7 Sense 33k CSPD SetTh SMIN FG Gnd 1 1 R8 470 Rsense 0.1 C4 0.1uF 3 Q1-4 ZXMC 3A17DN8 5&6 470 R2 SPD CLCK R10 16k R6 1k H+ PWMSPD DC control 3 V+OP C3 0.47F FG 0V Typical Applications Circuit for DC Control using the ZXBM1021 and ZXMC MOSFET 1/2 Bridge Drivers Note: 4. FG pull-up resistor is not shown in the typical application circuit. Generally, the FG pull-up resistor is located at the system host end rather than the fan motor PCB. ZXBM1021 Document number: DS36322 Rev. 2 - 2 2 of 25 www.diodes.com April 2014 (c) Diodes Incorporated ZXBM1021 Pin Descriptions Package types: U-QFN4040-20 and QSOP-20 Pin Number U-QFN4040-20 QSOP-20 Pin Name Description Hall Bias Supply Voltage Output Pin. Output voltage is 1.75V typical to supply the external unbuffered (`naked') Hall element. A resistance can be added in series with Hall element if lower bias voltage is needed. 1 4 HBIAS 2 3 5 6 ThRef PWMSPD 4 7 SPD 5 8 CSPD 6 9 SMIN 7 10 CLCK 8 11 GND 9 12 FG 10 13 SetTh 11 14 Sense 12 13 14 15 16 17 SetThRef Ph1Hi Ph2Hi 15 18 Ph2Lo 16 19 Ph1Lo 17 20 V+OP 18 1 VCC Power Supply Pin 19 20 2 3 H+ H- Hall Device Positive Input Pin. When H+ is higher in relation to H-, Ph2 is active. Hall Device Negative Input Pin ZXBM1021 Document number: DS36322 Rev. 2 - 2 5V Reference Voltage Output Pin. This voltage is used to supply the external networks. Speed Control PWM Signal Input Pin. PWM signal should be between 0% to 100% duty ratio. DC Voltage Speed Control Input Pin. The control signal voltage should be between 3V for 0% (stop) to 1V for 100% (full speed) speed control. In DC voltage mode, connect a capacitor between SPD and ground. Output Pin of the PWM Speed Control Input Signal Integrator. In PWM speed control mode, connect a 0.1F capacitor from CSPD pin to ground and connect CSPD pin to SPD pin. In DC voltage speed control mode, leave this pin unconnected. Minimum Speed Setting Pin. Voltage between 3V to 1V on this pin sets the minimum speed the motor is run at between 0% to full speed. The lowest minimum speed achieved depends on the motor coil design. Rotor Lock Detect, Auto Restart Timing and Soft-Start Timing Control Pin. Typically a 470nF capacitor is connected to this pin to set the soft-start (to full speed), lock detect and restart timings. Supply Return Ground Pin Frequency Generator Output to Provide a Tachometer Signal. This is a buffered output from the Hall amplifier. Current Sense Threshold Setting Pin. Used to set the threshold voltage that represents the maximum current to be taken by the motor. The current sense voltage at Sense pin is compared to the SetTh voltage. Current Sense Pin. Input for the signal from a sense resistor in the ground return of the H-bridge circuit to represent the current taken by the motor. A variable voltage source used to set the voltage on the SetTh pin. Phase 1 High-Side External Power Switch Drive Output Pin. This is a 50mA open-collector output. Phase 2 High-Side External Power Switch Drive Output Pin. This is a 50mA open-collector output. Phase-2 Low-Side External Power Switch Drive Output Pin. Darlington emitter follower output with active pull down to give source/sink current of 100mA/100mA. Phase-1 Low-Side External Power Switch Drive Output Pin. Darlington emitter follower output with active pull down to give source/sink current of 100mA/100mA. Phase Low Output Supply Pin. Only the low side output drives for Ph1Lo and Ph2Lo are supplied by the V+OP pin. For external MOSFET power devices, a resistor from VCC pin to V+OP slows down the turn-on speed of the low-side MOSFET S and therefore helps prevent shoot-through during turn-on of low-side switches. For external Bipolar power devices, a resistor between the VCC pin and V+OP controls the current into the transistor base. 3 of 25 www.diodes.com April 2014 (c) Diodes Incorporated ZXBM1021 Functional Block Diagram (Note 5) D2 Vcc Vcc V+OP ThRef PWMSPD PWMSPD PWM speed control Ph1 Hi Vref PWM Integrator Ph2 Hi Phase Drive CSPD SPD VSPD Voltage Speed Control PWM Osc Vcc Ph1 Lo SMIN CLCK Phase Drive & Control Set Min Speed Vcc Ph2 Lo SetThRef Locked Rotor Detect Sense Start-up HBIAS Hall Bias H+ Hall H- Hall Amp Current Monitor SetTh RD Speed & Lock Detect Vcc FG Gnd Note: 5. The ZXBM1021 has an open-collector FG. Typically a pull-up resistor of 10k is recommended from FG pin to the supply voltage. ZXBM1021 Document number: DS36322 Rev. 2 - 2 4 of 25 www.diodes.com April 2014 (c) Diodes Incorporated ZXBM1021 Absolute Maximum Ratings (Note 6) @TA = +25C, unless otherwise specified.) Symbol Characteristics Values VCCMAX Supply Voltage (Note 7) ICCMAX IC Input Current PDMAX Power Dissipation (See thermal de-rating curve on `Thermal Performance' section) Unit -0.6 to 20 V 200 mA 820 820 mW mW -55 to +150 C U-QFN4040-20 QSOP-20 TST Storage Temperature Range TJ Maximum Junction Temperature 150 C Human Body Model (HBM) ESD Capability Machine Model (MM) ESD Protection 2 300 kV V ESD HBM ESD MM Notes: 6. Stresses greater than the 'Absolute Maximum Ratings' specified above may cause permanent damage to the device. These are stress ratings only; functional operation of the device at these or any other conditions exceeding those indicated in this specification is not implied. Device reliability may be affected by exposure to absolute maximum rating conditions for extended periods of time. 7. The absolute maximum VCC of 20V is a transient stress rating and is not meant as a functional operating condition. It is not recommended to operate the device at the absolute maximum rated conditions for any period of time. Recommended Operating Conditions Symbol Characteristic VCC TA Min Max Supply Voltage Operating, -40C to +110C Conditions 6.8 18.0 Unit V Operating Temperature Range Operating -40 +110 C Electrical Characteristics (@TA = +25C, VDD = 12V, unless otherwise specified.) Symbol Characteristics Supply Current ICC Hall Connections VIN Hall Amplifier Input Voltage Conditions No Load (Note 8) Min Typ Max Unit -- 10 15 mA 40 -- VCM Hall Amplifier Common Mode Voltage 0.5 -- VHYS Diff peak to peak mV VThRef V Hall Amplifier Input Hysteresis -- 12 IBS Hall Amplifier Bias Current -- 700 1000 nA VHB Hall Bias Voltage 1.5 1.75 1.95 V IHB Hall Bias Output Current Capability -- -- 10 mA IOThRef = 10mA, +25C 4.85 5 5.15 V IOThRef = 10mA, -40C to +110C 4.75 5 5.25 V -- -- 10 mA 18 25 -- kHz IHB = 10mA mV Reference Voltage VThRef ThRef Reference Output Voltage IOThRef ThRef Output Current Capability PWM Oscillator FPWM PWM Frequency DC Voltage Speed Control VSPDL SPD Voltage Minimum 100% PWM drive -- 1 -- V VSPDH SPD Voltage Maximum 0% PWM drive -- 3 -- V SPD Pin Current at speed demand of 50% of the full speed and without minimum speed setting VSPD = 2V SMIN = 0V -- 0.5 2 A SPD Pin Current with minimum speed setting of 50% of the full speed VSPD = 3V RSPD =10k SMIN = 2V -- 100 -- A SPD Pin voltage to output PWM linearity VSPD = 2V -- -- 3 % ISPD ISPD_SMIN2V LinSPD Note: 8. Measured with pins H+, H-, CLCK and CPWM and all other signal pins open circuit. ZXBM1021 Document number: DS36322 Rev. 2 - 2 5 of 25 www.diodes.com April 2014 (c) Diodes Incorporated ZXBM1021 Electrical Characteristics (cont.) (@TA = +25C, VDD = 12V, unless otherwise specified.) Symbol PWM Speed Control Characteristics VPWMSPDH PWMSPD High Level VPWMSPDL PWMSPD Low Level IPWMSPD PWMSPD High Level Input Current DPWMSPD PWM Speed Signal Duty Range FPWM_MAX Maximum Frequency of PWM Control Signal LinINT Conditions Min Typ 2 0.8 0 PWMSPD Pin PWM Duty Ratio to CSPD Output Voltage Linearity PWMSPD duty ratio 50%, PWM frequency FPWM = 25kHz 1.94 Max Unit VCC V 0.4 V 2 A 100 % 100 kHz 2 2.06 V -0.25 -0.5 A Minimum Speed Setting ISMIN SMIN Input Current VSMIN = 2V Soft-Start Time to Full Speed CLCK = 0.47F Soft Start tSS 3 s Lock Timing 1:8 Lock Condition TLCKDET : TOFF ratio ILCKCL CLCK Charge Current - Soft Start (from lock) and in Lock Mode Lock mode, VCLCK = 2.5V 0.45 0.7 1.07 A ILCKCR CLCK Charge Current - Run Run mode 3.25 5.5 9.0 A CLCK Discharge Current - Lock Lock mode, VCLCK = 2.5V 0.45 0.7 1.07 A ILCKDL VCLCKTHH CLCK High Threshold Voltage VCLCKTHL CLCK Low Threshold Voltage Lock mode VSetThRef SetThRef Output Voltage ISetThRef = 200uA ISetThRef SetThRef Output Current 5 V 0.6 V Current Limit ThRef0.17 ThRef0.1V ThRef0.05 V -200 A ISENSE Sense Input Current -20 -100 nA ISetTh SetTh Input Current -20 -100 nA Output Drives VOH Ph1Lo and Ph2Lo Output High Voltage IOH = 100mA VOLA Ph1Lo and Ph2Lo Output Low Voltage IOL =100mA (Note 9) 0.3 0.5 V V VOLB Ph1Lo and Ph2Lo Output Low Voltage IOH = 50A (Note 10) 0.3 0.5 V VCC - 2.2 VCC - 1.7 IOH Ph1Lo and Ph2Lo Output Source Current 100 mA IOL Ph1Lo and Ph2Lo Output Sink Current 100 mA VOLA Ph1Hi and Ph2Hi Output Low Voltage IOL Ph1Hi and Ph2Hi Output Sink Current IOFF Ph1Hi and Ph2Hi Off Output Leakage Current tCD Commutation Delay 0.3 IOH =50mA (Note 10) 20 0.5 V 50 mA 100 nA 70 s Output Flags IFGOL FG Low Level Output Current Capability VFGOL FG Low Level Output Voltage Lock Conditions Lock Detect Time (time it waits for before next Hall signal before deciding to turn outputs off TLCKDET for fixed time) Output Off Time after lock is detected. TOFF Notes: IFGOL = 10mA CLCK =0.47F ILCKCR = 5.5A CLCK =0.47F 10 mA 0.4 V 400 ms 3 s 9. Measured when opposing Phase Output is Low. 10. Measured when opposing Phase Output is High. ZXBM1021 Document number: DS36322 Rev. 2 - 2 6 of 25 www.diodes.com April 2014 (c) Diodes Incorporated ZXBM1021 Functional Descriptions H-Bias - Hall Bias Output This is a 1.75V nominal voltage source to bias a differential un-buffered Hall element sensor. If a Hall element requires a lower voltage than the H-Bias output, connect an appropriate value resistor between the H-Bias pin and the Hall element supply pin. H+ and H- - Hall Inputs 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 VThRef. When H+ is high in relation to H-, Ph2 is the active drive. ThRef - Output Reference Voltage This is a 5V nominal reference output voltage. It is designed to 'source' current and therefore it will not 'sink' any current from a higher voltage. The total current drawn from the ThRef pin by any external circuitry, such as the minimum speed potential divider to S MIN pin, should not exceed 10mA. SPD -Speed Control DC Voltage 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 variable DC voltage input of range 3V to 1V, representing 0% to 100% drive respectively. If variable speed control is not required this pin can be tied to an external potential divider to set a fixed speed or tied to ground to provide full speed i.e. 100% PWM drive. If required this pin can also be used as an enable pin. The application of a voltage >3.0V on this pin will force the PWM drive fully off, in effect disabling the drive, providing the minimum speed function is not active (see SMIN pin section below). 1 in typical application circuit for DC control in page 2) between speed control DC voltage input source and SPD pin. PWMSPD - Speed Control PWM Signal Input The duty ratio of the speed control PWM signal input to this pin controls the fan motor speed by varying the output drive PWM ratio at the Ph1Lo and Ph2Lo outputs. In the PWM speed control mode, the PWMSPD pin and the CSPD pin work together to the control the speed. The PWM signal input on the PWMSPD pin is integrated by the capacitor on the CSPD pin (See CSPD pin description). PWM control input signal to the PWMSPD pin needs to be a TTL logic levels. CSPD - PWM Speed Control Signal Integrator Output When PWM input signal is used to control the motor speed, PWM signal is integrated to DC voltage between 1V to 3V to for speed control. If PWMSPD pin input is TTL low, the output voltage on CSPD is 3V and if PWMSPD pin is TTL high, the CSPD pin output is at 1V. In order for the nput PWM frequency applied to the PWMSPD input. In PWM speed control mode, SPD pin to ground and connect CSPD pin to SPD pin. When in DC voltage speed control mode keep PWMSPD and CSPD pins unconnected. SMIN - Minimum Speed Setting A voltage can be set on this pin via a potential divider between the ThRef and GND pins. This voltage is monitored by the SPD pin to clamp the SPD control voltage so that it does not rise above SMIN voltage. As a higher voltage on the SPD pin represents a lower speed, the SMIN setting prevents the motor speed going lower than the minimum speed set by the SMIN pin. 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 onto the SPD pin then either this feature should not be used or if the minimum ZXBM1021 Document number: DS36322 Rev. 2 - 2 7 of 25 www.diodes.com April 2014 (c) Diodes Incorporated ZXBM1021 Functional Descriptions (cont.) CLCK - Locked Rotor Timing Capacitor The CLCK pin will have a capacitor connected to ground. It is a multi-function pin providing timing for the lock detect, auto-restart and soft-start conditions. Different rates of charge and discharge of CLCK capacitor depending on the mode of operation (fan operation status) give the softstart (TSS) to full speed, lock-detect time (TLCKDET) and lock time (TOFF) before next auto-start retry. When the motor is running, the capacitor is discharged at every Hall signal change. CLCK pin provides the timing for the Locked Rotor monitor. In normal operation, and after the soft-start period, Lock Detect is enabled. If the Hall signal does not change (i.e. a rotor lock condition) within the Lock Detect time (T LCKDET), the outputs are disabled. In this condition the motor will not be driven for a set time TOFF. This TOFF time depends on the external CLCK capacitor value and its internal discharge current (ILCKDL). After the TOFF period device goes into a soft-start period (TSS) to re-start the motor. If the motor has not turned to generate a transition on the Hall inputs by the end of this period, motor re-enters motor lock TOFF period with outputs disabled. Once the fan is running normally at the end of a soft-start period, the motor is deemed as running and goes into lock-detection mode. The time periods of TSS, TLCKDET and TOFF are determined by the value of the external capacitor on the CLCK pin and the internal charge and discharge currents during these time periods. The currents during TSS, TLCKDET and TOFF are ILCKCL, ILCKCR and ILCKDL respectively. During soft-start mode, the SetThRef voltage is increased from 0 to Vref. A potential divider from SetThRef is used to generate SetTh voltage for current limit. As SetThRef ramps to nominal value, current limit set also ramps from 0 to nominal setting. This gradual release of current limit to full speed level provides the soft-start. FG - Frequency Generator (Tachometer) Output 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. Hall VTHH CLCK VTHL TLCKDET TOFF Tss FG FG Timing Diagram ZXBM1021 Document number: DS36322 Rev. 2 - 2 8 of 25 www.diodes.com April 2014 (c) Diodes Incorporated ZXBM1021 Functional Descriptions (cont.) Sense - Current Control Sense This pin is used by the current sensing circuit 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. SetTh - Current Control Threshold Voltage This pin is used by the current sensing circuit as the reference voltage for the voltage on the sense pin to be compared against. If the voltage on the sense pin starts to exceed the voltage set on this pin the current control circuitry starts to back off the output drive PWM duty and thus reducing the current being supplied to the motor coil. SetThRef - SetTh and Start-up Reference This pin is derived from an internal start-up circuit and is used as the source voltage for the potential divider network attached to the SetTh pin. Under running conditions this voltage will be typically ThRef-0.1V. However, during start up the voltage ramps up from 0V to ThRef-0.1V at a rate determined by the capacitor on the CLCK pin giving a gradual release of current limit from 0 to nominal setting. ThRef-0.1V is equal to 4.9V typical. This low power pin is capable of supplying a maximum of 200A. It should only be used to supply the potential divider network attached to the SetTh pin. Ph1Lo and Ph2Lo - Low-Side External H-Bridge Drive Output Ph1Lo and Ph2Lo outputs drive the low side of the external power device H-bridge that in turn drives the single phase winding. These outputs provide both the commutation and PWM waveforms. The outputs are active pull-up and active pull-down to help faster switching off when driving MOSFET devices with a high gate capacitance. When in the high state the outputs will provide up to 100mA of drive into the base or gates of external transistors as shown in the typical application circuit shown on the front page. When in the low state the active phase drive is again capable of sinking up to 100mA 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 and Ph2Hi - High-Side External H-Bridge Driver Ph1Hi and Ph2Hi are the high side outputs to the external H-bridge and are open collector outputs capable of sinking 50mA. This signal provides commutation only to the H-bridge. V+OP - Phase Outputs Supply Voltage This pin is the supply to the Phase outputs Ph1Lo and Ph2Lo only. This pin can be connected to V CC pin directly or through a resistor. For external Bipolar power devices the resistor on V+OP is used to control the current into the transistor base and its value is chosen accordingly. For external MOSFET power devices, the pin can be used to slow down the turn-on speed of the low-side MOSFETS. Slowing down the turn-on speed of low side switches helps to prevent parasitic turn-on of the high-side switches and thus helping to prevent shoot-through during turn-on of low-side switches. The gate resistor connected at Ph1Lo and Ph2Lo plus the resistor on V+OP controls the turn on speed of the MOSFET. The turn-off of speed of the MOSFETS is controlled by the gate resistor only. VCC - IC Supply voltage This provides the supply for the device's internal circuitry except Ph1Lo and Ph2Lo output stages, which are supplied from the V+OP pin. For 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 or low drop out regulator. GND - Supply Return This is the device supply ground return pin and will generally be the most negative supply pin to the fan. ZXBM1021 Document number: DS36322 Rev. 2 - 2 9 of 25 www.diodes.com April 2014 (c) Diodes Incorporated ZXBM1021 5.50 100 5.40 90 5.30 80 5.20 70 PhLo Duty Cycle (%) ThRef (V) Typical Operating Characteristics 5.10 5.00 4.90 6V8 4.80 12V 4.70 18V 4.60 60 50 40 30 20 10 4.50 0 -50 -25 0 25 50 75 100 125 0 10 Ambient operating temperature T A ( C) 20 30 40 50 60 70 80 90 100 Speed control PWM signal (PWMSPD) duty cycle (%) PhLo Output Duty Cycle vs. Speed Control PWM Signal (PWMSPD) Duty Cycle ThRef vs Ambient Temperature 100 3.2 90 3.0 2.8 80 2.6 70 CSPD Voltage (V) Duty Cycle (%) 2.4 60 50 40 30 20 2.2 2.0 1.8 1.6 1.4 1.2 10 1.0 0 0.9 1.1 1.2 1.4 1.5 1.7 1.8 2.0 2.1 2.3 2.4 2.6 2.7 2.9 3.0 3.2 PhLo Output Duty Cycle vs Speed control DC Voltage (SPD) Document number: DS36322 Rev. 2 - 2 10 20 30 40 50 60 70 80 90 100 Speed control PWM signal (PWMSPD) Duty Cycle (%) Speed control DC voltage SPD (V) ZXBM1021 0 10 of 25 www.diodes.com CSPD Voltage vs Speed Control PWM Signal (PWMSPD) Duty Cycle April 2014 (c) Diodes Incorporated ZXBM1021 Application Information The ZXBM1021 is primarily controlled by a voltage on the SPD pin or a PWM signal on the PWMSPD pin. A voltage of 1V represents a 100% PWM at the Phase Outputs and in turn represents full speed. 3V on the SPD pin conversely represents 0% PWM. The motor can therefore be controlled simply by applying a control voltage onto the SPD pin with the minimal use of external components. This voltage control method easily lends itself to control by other signal types. For example if a thermistor is applied to the SPD pin a varying voltage can be generated at the SPD pin as the resistance of the thermistor varies with temperature. A common form of control of fans is by a PWM signal derived from a central processor or controller. This speed control PWM signal can be applied to PWMSPD pin. Motor speed is proportional to the duty ratio of the applied PWM speed control signal on PWMSPD pin. Voltage on the SMIN pin sets the minimum speed of the motor. If the speed demand by either DC signal on SPD pin or PWM signal on PWMSPD pin is lower than the minimum speed setting, motor will run at minimum speed. The design of a motor system will be set around the maximum speed, the minimum speed and the current of the motor. The design of the motor coil and the voltage on the output stage will set the maximum speed of the motor. The ZXBM1021 allows easy setting and control of the minimum speed and maximum motor current, as well as for controlling the speed. DC Speed Control The SPD pin will respond to an input DC voltage from 3V to 1V for 0% to 100% of the full speed. To allow internal minimum speed setting (SMIN) and current control (ILIM) circuits to adjust the SPD pin voltage, the speed control DC voltage signal should be driven in via a 10k series resistor. The series resistor allows the SPD pin to vary even when driven externally by a low impedance source. A 0.1F capacitor should be connected from the SPD pin to supply ground. 4 5 Ph2Hi V+OP VCC Ph2Lo PWMSPD ZXBM1021 Ph1Hi SPD SetThRef CSPD Sense SMIN C 0.1F 6 7 8 9 15 14 13 12 11 SetTh 3 ThRef CLCK DC Speed Control (3V to 1V) R 10k 16 Ph1Lo FG 2 17 HBIAS GND 1 18 H+ 19 H- 20 10 When used in DC speed control mode, PWMSPD and CSPD pins should be left floating. ZXBM1021 Document number: DS36322 Rev. 2 - 2 11 of 25 www.diodes.com April 2014 (c) Diodes Incorporated ZXBM1021 Application Information (cont.) This input also allows the fan to be driven by a thermistor, to allow the speed to be controlled according to temperature. An example circuit is shown below. 4 5 R13 9.1k C4 0.1F PWMSPD Ph2Hi V+OP VCC ZXBM1021 SetThRef CSPD Sense 6 7 8 14 13 Ph1Hi SPD SMIN NTC 10k Ph2Lo 15 12 11 SetTh 3 R11 10k ThRef FG R12 4.7k 16 Ph1Lo GND 2 17 HBIAS CLCK 1 18 H+ 19 H- 20 10 9 o With the values shown, and a Beta value of 4000 for the NTC, the above circuit drives the ZXBM1021 with 3V (minimum speed) at 0 C, changing o to 1V (maximum speed) at 82 C, subject to tolerances. To minimize additional circuitry, the 5V ThRef output from the ZXBM1021 IC can supply the current required for the thermistor network circuit as long as the total current from ThRef does not exceed 10mA. PWM Speed Control An additional input allows for the use of PWM to control the fan speed. The ZXBM1021's output speed is proportional to the duty cycle of the PWM input. PWMSPD Ph2Hi V+OP VCC ZXBM1021 Ph1Hi SPD SetThRef CSPD Sense 6 7 8 9 15 14 13 12 11 SetTh 5 C4 0.1F Ph2Lo FG 4 ThRef GND 3 PWM Speed Control (TTL level, Duty ratio 0% to 100%) 16 Ph1Lo CLCK 2 17 HBIAS SMIN 1 18 H+ 19 H- 20 10 When using PWMSPD speed input, the SPD pin should be connected to C SPD with a 0.1F capacitor connected to ground. PWMSPD can be driven from a microcontroller with either 0-5V or 0-3.3V logic levels signal. The recommended frequency of the input PWM control signal is 25kHz. ZXBM1021 Document number: DS36322 Rev. 2 - 2 12 of 25 www.diodes.com April 2014 (c) Diodes Incorporated ZXBM1021 Application Information (cont.) SMIN Minimum Speed Setting Minimum speed setting prevents the motor from running below a set speed regardless of whether the control applied is for a slower speed (either DC or PWM input). The minimum motor speed is chosen based on a speed below which the motor may or fail to start. The SMIN pin voltage sets a maximum voltage clamp for the SPD pin. For a DC voltage input into SPD pin, the voltage range 3V to 1V represents 0% to 100% of full speed. In order to set a minimum speed of 20%, SMIN should be set 20% into this range below 3V, i.e 2.6V. 100% 90% 80% Motor speed (%) 70% 60% 50% 40% 30% SMIN = 2.6V 20% 10% SMIN = 3V 0% 3 2.8 2.6 2.4 2.2 2 1.8 1.6 1.4 1.2 1 DC speed control voltage at SPD pin (V) SPD and SMIN Voltages vs Motor Speed Minimum speed is set by the voltage on the SMIN pin, using a potential divider from the ThRef voltage output as shown below. 5 R10 13k PWMSPD Ph2Hi V+OP SetThRef CSPD Sense 7 8 The SMIN voltage is given by MI Document number: DS36322 Rev. 2 - 2 Ph1Hi SPD 6 ZXBM1021 VCC ZXBM1021 Th ef 9 9 15 14 13 12 11 SetTh 4 Ph2Lo FG 3 ThRef GND R9 12k 16 Ph1Lo CLCK 2 17 HBIAS SMIN 1 18 H+ 19 H- 20 10 10 10 13 of 25 www.diodes.com April 2014 (c) Diodes Incorporated ZXBM1021 Application Information (cont.) ThRef is capable of driving 10mA, but it is not necessary to draw much current for S MIN. et 10 9 in the range 5k-50k (1mA - 100A). ThRef may also be used to drive a thermistor circuit, so care must be taken to keep the total current drawn from ThRef to the correct level. Example: Required SMIN of 20% = 2.6V MI Th ef 2. 5 9 9 10 10 10 10 Solve for R9 9 2. 10 Choose R10 = 13k and solve for R9 which gives R9 = 12k. The current in R10+R9 string = 5/25000 = 200A If SMIN is not required, the SMIN pin should be pulled up externally to Th ef by 1k Motor Current Limit The motor current limit on ZXBM1021 compares the voltage on the Sense pin against the threshold voltage on the SetTh pin. The current limit is triggered when the voltage at the Sense pin exceeds the threshold at SetTh. The device lowers the output PWM drive duty ratio if the voltage on the Sense pin rises above the threshold voltage on the SetTh pin. The threshold value at SetTh pin is set using R7 and R8 between SetThRef, SetTh and GND. The Sense voltage is generated by the motor current flowing through the sense resistor. It is recommended to use 100m for the sense resistor on the ense pin, and vary the current limit by changing R7 and R8. PWMSPD Ph2Hi V+OP VCC ZXBM1021 Ph1Hi SPD SetThRef CSPD Sense SMIN 5 Ph2Lo 6 7 8 9 15 Motor coil 14 13 12 11 SetTh 4 ThRef FG 3 16 Ph1Lo GND 2 17 HBIAS CLCK 1 18 H+ 19 H- 20 R7 10 Rsense R8 The current limit, ILIM, is given by IM ote that etTh ef has a maximum output current of 200A, therefore 7 ZXBM1021 Document number: DS36322 Rev. 2 - 2 8 must be larger than 25k. 14 of 25 www.diodes.com April 2014 (c) Diodes Incorporated ZXBM1021 Application Information (cont.) Example: Required ILIM = 2A IM where SetThRef = (ThRef -0.1V) = 4.9V typical Solve for R7 7 .9 8 Choose R8 = 2k and solve for R7 which gives R7 = 47k. The current in R7+R8 string = 4.9/49000 = 100A which is within maximum output current capability of the SetThRef pin. It is important that the current limit be set above the intended average current of the motor. In practice, due to the variable nature of the motor current through a commutation cycle, it is usually necessary for the current limit to be set higher than the peak current drawn at the beginning of each commutation cycle. The top trace shows the motor coil current, while the lower trace shows the Sense pin voltage. As the current flow direction in the motor coil changes at each commutation cycle, the motor current in the top trace is shown as positive and negative current. The current flowing in the Rsense is always in the same direction and therefore the sense pin reads the magnitude of the motor coil current. Current limiting may prevent the motor from reaching full speed, despite the average current being significantly lower than the current limit. The system will limit the tail-end current according to the current limit set. Current limit setting can also be used to remove the tail-end current. Example of using current limit to reduce tail-end current at full speed is shown in fibelow Current limit set much higher than the peak tail-end current (Peak tail-end current = 180mA typ, Current limit set at 0.485mA ) ZXBM1021 Document number: DS36322 Rev. 2 - 2 15 of 25 www.diodes.com April 2014 (c) Diodes Incorporated ZXBM1021 Application Information (cont.) Current limit set lower than the peak tail-end current (Tail-end current = 145mA typ, Current limit set at 0.166mA) CLCK Value The value of CLCK affects three important timings for the ZXBM1021: Soft Start, Lock Detect and Off-time. Soft Start When the system is initially powered on, it will go through the soft-start period, during which the motor is gradually ramped to full speed. The soft start operation relies on the current control feature being implemented and generally the current limit is set slightly above the normal running current. In the soft start process, at power-on the voltage at CLCK will rapidly increase to the low threshold, VCLCKTHL (0.6V). Then, CLCK will be charged from 0.6V up to the high threshold, VCLCKTHH (5V) at a constant current, ILCKCL, which is typically 0.7A. The the time taken to charge the capacitor form VCLCKTHL to VCLCKTHH level depends on the value of CLCK capacitor. The soft-start time tss is given by: Since VCLCKTHH, VCLCKTHL and ILCKCL are fixed, this becomes simply: For the default value of CLCK, 0.47F, soft-start time is: This is the 3s stated in the datasheet electrical parameter section. Lock Detect When the motor is running, the hall sensor will follow the rotor magnetic flux density to detect the commutation point. Should the rotor lock, the signal from the hall sensor will cease. The value of CLCK defines the lock detect time period before the ZXBM1021 shuts down the outputs in order to prevent damage to the coil. The ZXBM1021 internal system returns CLCK voltage to the low threshold, VCLCKTHL (0.6V), each time the hall sensor provides a commutation signal. CLCK then charges at the run current, ILCKCR, which is typically 5.5A. If the voltage on CLCK reaches the high threshold, VCLCKTHH (5V), before the hall sensor provides the next commutation signal then the system will shut down by entering the lock condition. The thresholds voltage and charge current are fixed, therefore the time depends only on the value of CLCK: For the default value of CLCK, 0.47F, tLCKDET is as follows: This should not interfere with normal operation of a fan as the time period for lock detection is many times longer than the expected time for one revolution. As the hall sensor will detect 4 transitions in a single revolution, 0.376s between transitions would equate to a rotational speed of 40rpm. For use in systems where extremely low rotation speeds are required, the lock detect time can be increased by making the CLCK capacitor value larger. ZXBM1021 Document number: DS36322 Rev. 2 - 2 16 of 25 www.diodes.com April 2014 (c) Diodes Incorporated ZXBM1021 Application Information (cont.) Off Time If the above lock detection causes a device shutdown, CLCK is used again to provide the time period, tOFF. This is the time for which the device will remain shut down after rotor lock is detected. The output shutdown period, tOFF, depends CLCK being discharged from the high threshold to the low threshold at the discharge current ILCKDL, typically 0.7A. As above, the threshold voltages and discharge current are fixed, therefore the time depends only on the value of CLCK: For the default value of CLCK, 0.47F, tOFF is as follows: FF A note on probing CLCK Due to the very small charge and discharge currents involved with C LCK, putting an oscilloscope probe onto that node can have a significant impact on the charge time. The above graph shows simulation for the impact on soft-start tSS. A typical 10X voltage probe will have 10M resistance, which is enough to increase soft-start time from 3 seconds to over 5 seconds. Probing this point can be useful in understanding the operation of the system but it is important to be aware of the impact that the scope probe will have on the operation of the circuit. ZXBM1021 Document number: DS36322 Rev. 2 - 2 17 of 25 www.diodes.com April 2014 (c) Diodes Incorporated ZXBM1021 Application Information (cont.) Output Device Driving In order to drive the output stage efficiently, it is important to minimise shoot-through currents. The ZXBM1021 has a built-in delay (commutation dead-time) to allow time for re-circulating currents to be absorbed however parasitic shoot-through can still occur. This is when the rapid switchon of the low-side MOSFET causes a low-going pulse through the high-side MOSFET to the gate, causing it to switch on momentarily. Slowing the switch-on of the low-side MOSFET can eliminate this effect. D2 System supply (12V) D1 Optional V+OP VCC H+ Ph1Lo ThRef Ph2Lo PWMSPD ZXBM1021 Ph1Hi SPD SetThRef CSPD Sense SMIN 5 Motor coil R1 6 7 8 9 R2 15 14 13 12 11 SetTh 4 16 HBIAS FG 3 17 GND 2 18 CLCK 1 R12 19 H- 20 R4 R3 R6 R5 Ph2Hi Optional, system dependent 10 Rsense The resistors R1 to R6 and R12 in the diagram allow for control of switch-on and switch-off times for the top and bottom MOSFETs separately. High-side MOSFETs switching speed: R3 and R5 control the discharge of the gates of the high-side P-channel MOSFETSs, limiting the switch-on speed. R4 and R6 control the charging of the gates of the P-channel MOSFETs, limiting the switch-off speed. Low-side MOSFETs switching speed: R1 and R2 are series gate resistors for the N-channel FETs, affecting both switch-on and switch-off times. R12 is the series resistor for the V+OP pin of the ZXBM1021. This resistor is effectively in series with R1 or R2 when that low-side N-channel device is switched on, limiting the switch-on time. R12 allows to vary the switch-on time relative to the switch-off time to prevent parasitic shoot-through at turn-on. When using bipolar output devices the resistors serve similar functions in limiting the base currents of the transistors. ZXBM1021 Document number: DS36322 Rev. 2 - 2 18 of 25 www.diodes.com April 2014 (c) Diodes Incorporated ZXBM1021 Application Information (cont.) External Drive Transistors Diodes offers a range of devices that are ideally suited to interface between the ZXBM1021 pre-driver and the motor. The following tables show a selection of products. For more comprehensive listings or the latest information please refer to the Diodes website: www.diodes.com. MOSFETs BVDSS ID RDS(ON) @ VGS = 10V (V) (A) (4.5V for 20V parts) () Power Switch: N-Channel MOSFETs Part Number Type DMC2020USD N P 20 -20 7.4 -5.9 0.020 0.033 SO8 DMC2038LVT N P 20 -20 4.5 -3.2 0.035 0.074 TSOT26 DMC3028LSD N P 30 -30 7.1 -7.4 0.028 0.025 SO8 DMC4040SSD N P 40 -40 7.5 -7.3 0.025 0.025 SO8 N P N P N P 40 -40 7.2 -5.2 0.028 0.050 SO8 60 -60 4.7 -3.9 0.055 0.085 SO8 60 -60 5.1 -4.8 0.045 0.055 SO8 DMC4028SSD ZXMC4559DN8 ZXMC6A09DN8 BVDSS ID RDS(ON) @ VGS = 10V (V) (A) () Power Switch: N-Channel MOSFETs 100 7.7 0.085 100 4.0 0.125 Package Part Number Type ZXMN10A09K ZXMN10A25K N N ZXMN10A11G ZXMN10A08DN8 ZXMN10B08E6 ZXMN10A07Z ZXMN6A09K ZXMN6A25K N 2xN N N N N 100 100 100 100 60 60 2.4 2.1 1.9 1.4 11.2 10.7 0.35 0.25 0.230 0.7 0.04 0.05 SOT223 SO8 SOT23-6 SOT89 TO252-3L TO252-3L DMN6068LK3 ZXMN6A09G ZXMN6A25G ZXMN7A11K ZXMN6A09DN8 DMN6068SE ZXMN6A08G N N N N 2xN N N 60 60 60 60 60 60 60 8.5 7.5 6.7 6.1 5.6 5.6 5.3 0.068 0.04 0.05 0.120 0.04 0.068 0.08 TO252-3L SOT223 SOT223 TO252-3L SO8 SOT223 SOT223 ZXMN6A25DN8 ZXMN6A11Z ZXMN6A07Z ZXMN6A07F 2xN N N N 60 60 60 60 4.7 3.6 2.2 1.4 0.055 0.120 0.250 0.250 SO8 SOT89 SOT89 SOT23 ZXBM1021 Document number: DS36322 Rev. 2 - 2 19 of 25 www.diodes.com Package TO252-3L TO252-3L April 2014 (c) Diodes Incorporated ZXBM1021 Application Information (cont.) Part Number Type Power Switch: P-Channel MOSFETS ZXMP10A18K P ZXMP10A18G P BVDSS (V) ID (A) RDS(ON) @ VGS = 10V () Package -100 -100 -5.9 -3.7 0.150 0.150 TO252 SOT223 0.350 0.125 0.055 0.025 0.011 0.060 0.017 SOT26 SO8 TO252 SO8 POWERDI5060-8 SOT223 POWERDI3333-8 ZXMP10A17E6 ZXPM6A17DN8 ZXMP6A18K DMP4025LSD DMP4015SPS ZXMP4A16G DMP3008SFG P 2xP P 2xP P P P -100 -60 -60 -40 -40 -40 -30 -1.6 -3.2 -10.4 -7.6 -13 -6.4 -11.7 Part Number Type VCEO (V) IC (A) FZT855 FMMT624 ZX5T853G ZXTN19100CZ NPN NPN NPN NPN ZXTN25100BFH ZXTN25100DFH FCX493 FCX1053A ZXTN19060CG ZX5T851G DXT2010P5 BJTs VCE(sat) @IC/IB ( mV@A/mA ) Package Power switch: NPN BJT 150 4 125 1 100 6 100 5.25 65 @ 0.5/50 150 @ 0.5/50 125 @ 2/100 65 @ 1/100 SOT223 SOT23 SOT223 SOT89 NPN NPN NPN NPN NPN NPN NPN 100 100 100 75 60 60 60 3 2.5 1 3 7 6 5 135 @ 0.5/10 170 @ 0.5/10 300 @ 0.5/50 200 @ 1/10 155 @ 1/10 135 @ 2/50 70 @ 1/10 SOT23 SOT23 SOT89 SOT89 SOT223 SOT223 PowerDI5 FCX493A NPN FCX619 NPN FMMT619 NPN FCX619 NPN Drive Buffer and Level Shift FMMT493 NPN 60 50 50 50 1 3 2 3 500 @ 1/50 260 @ 2/50 220 @ 2/50 260 @ 2/50 SOT89 SOT89 SOT23 SOT89 100 1 300 @ 0.5/50 SOT89 60 60 60 1 1 1 250 @ 0.5/50 250 @ 0.5/50 140 @ 0.5/50 SOT23 SOT23 SOT563 FMMT493A ZXTN2038F DSS41604 ZXBM1021 Document number: DS36322 Rev. 2 - 2 NPN NPN NPN 20 of 25 www.diodes.com April 2014 (c) Diodes Incorporated ZXBM1021 Thermal Performance (1) Package type: QFN4040-20 0.9 0.8 Maximum Power (W) 0.7 0.6 0.5 0.4 0.3 0.2 0.1 Rthja = 45C/W 0.0 -50 -25 0 25 50 75 100 125 150 o Ambient Operating Temperature ( C) U-QFN4040-20 Derating Curve Note: 11. The power dissipation de-rating curve for ZXBM1021 in U-QFN4040-20 package is based on 2"x2" F substrate, 2oz copper, 1. mm thick PCB with minimum recommended pad layout on the top layer with thermal vias to all copper bottom layer and the `junction to ambient' thermal resistance (Rthja) of 45C/W. (2) Package type: QSOP-20 0.9 Maximum Power (W) 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 Rthja = 108C/W 0.0 -50 -25 0 25 50 75 100 125 150 o Ambient Operating Temperature ( C) QSOP-20 Derating Curve Note: 12. The power dissipation de-rating curve for ZXBM1021 in QSOP-20 package is based on 2"x2" F substrate, 2oz copper, 1. mm thick PCB all copper top layer (pad layout included) without any vias or the bottom layer copper and the `junction to ambient' thermal resistance (Rthja) of 108C/W. ZXBM1021 Document number: DS36322 Rev. 2 - 2 21 of 25 www.diodes.com April 2014 (c) Diodes Incorporated ZXBM1021 Ordering Information ZXBM1021 - XXX - XX Package Packing JB20 : U-QFN4040-20 Q20 : QSOP-20 TC : Tape & Reel Part Number Package Code Packaging ZXBM1021JB20TC ZXBM1021Q20TC JB20 Q20 U-QFN4040-20 QSOP-20 13" Tape and Reel Quantity Part Number Suffix 3000/Tape & Reel TC 2500/Tape & Reel TC Marking Information (1) Package type: U-QFN4040-20 ( Top View ) ZXBM 1021 YY WW (2) YY : Year : 00 ~ 99; WW : Week: 01 ~ 52 week; 52 Represents 52 and 53 week Part Number Package ZXBM1021JB20TC QFN4040-20 Identification Code ZXBM 1021 Package type: QSOP-20 20 (Top View) ZXBM1021 WW 1 YY YY : Year: 00 ~ 99; WW : Week: 01 ~ 52 week; 52 represents 52 and 53 week Part Number ZXBM1021Q20TC ZXBM1021 Document number: DS36322 Rev. 2 - 2 Package QSOP-20 22 of 25 www.diodes.com Identification Code ZXBM1021 April 2014 (c) Diodes Incorporated ZXBM1021 Package Outline Dimensions (All dimensions in mm.) Please see AP02002 at http://www.diodes.com/datasheets/ap02002.pdf for latest version. (1) Package type: U-QFN4040-20 A1 A3 A Seating Plane U-QFN4040-20 Dim Min Max Typ A 0.55 0.65 0.60 A1 0 0.05 0.02 A3 0.15 b 0.20 0.30 0.25 D 3.95 4.05 4.00 D2 2.40 2.60 2.50 E 3.95 4.05 4.00 E2 2.40 2.60 2.50 e 0.50 BSC L 0.35 0.45 0.40 Z 0.875 All Dimensions in mm D (Pin #1 ID) e E2 E D2 L b Z (8x) (2) Package Type: QSOP-20 D ZD E/2 E1/2 SEE DETAIL 'A' E1 h E h c PIN 1 e 1 b 20x 2 A A2 1 L L1 R1 R GAUGE PLANE SEATING PLANE L2 A1 ZXBM1021 Document number: DS36322 Rev. 2 - 2 23 of 25 www.diodes.com QSOP-20 Dim Min Max Typ A 1.55 1.73 A1 0.10 0.25 A2 1.40 1.50 b 0.20 0.30 c 0.18 0.25 D 8.56 8.74 E 5.79 6.20 E1 3.81 3.99 e 0.635 BSC h 0.254 0.508 L 0.41 1.27 L1 1.03 REF L2 0.254 BSC R 0.0762 R1 0.0762 ZD 1.47 REF 0 8 1 5 15 2 0 All Dimensions in mm April 2014 (c) Diodes Incorporated ZXBM1021 Suggested Pad Layout Please see AP02001 at http://www.diodes.com/datasheets/ap02001.pdf for the latest version. (1) Package Type: U-QFN4040-20 X3 X1(10x) Dimensions Y1(10x) C X X1 X2 X3 Y Y1 Y2 Y3 Y2 Y3 X2 Y(10x) Value (in mm) 0.500 0.350 0.600 2.500 4.300 0.600 0.350 2.500 4.300 1 C X(10x) (2) Package Type: QSOP-20 X1 Y 20x Dimensions C X X1 Y Y1 Y1 C 1 ZXBM1021 Document number: DS36322 Rev. 2 - 2 Value (in mm) 0.635 0.350 6.065 1.450 6.400 X 20x 24 of 25 www.diodes.com April 2014 (c) Diodes Incorporated ZXBM1021 IMPORTANT NOTICE DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein. 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Copyright (c) 2014, Diodes Incorporated www.diodes.com ZXBM1021 Document number: DS36322 Rev. 2 - 2 25 of 25 www.diodes.com April 2014 (c) Diodes Incorporated Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Diodes Incorporated: ZXBM1021JB20TC ZXBM1021Q20TC