LV8773 Bi-CMOS LSI PWM Constant-Current Control Stepper Motor Driver Application Note http://onsemi.com Overview The LV8773 is a 2-channel H-bridge driver IC, which supports forward, reverse, brake, and standby of a motor. It is ideally suited for driving brushed DC motors and stepper motors used in office equipment and amusement applications. Function • BiCDMOS process IC • Low on resistance (upper side: 0.3Ω; lower side: 0.25Ω; total of upper and lower: 0.55Ω; Ta = 25°C, IO = 2A) • Motor current selectable in two steps • Output short-circuit protection circuit (selectable from latch-type or auto-reset-type) incorporated • Unusual condition warning output pins • No control power supply required Typical Applications • Industrial • Cash Machine • Pachinko Game Machine • Slot Machine • Embroidery Machine Semiconductor Components Industries, LLC, 2013 December, 2013 1/30 LV8773 Application Note Package Dimensions unit: mm (typ) 3241A 26.75 (20.0) 28 11.2 12.7 15 (8.4) 1 14 3.6 (4.0) 1.0 0.4 (R1.7) (1.81) 1.78 0.6 SANYO : DIP28HC(500mil) Pin Assignment LV8773 2/30 VREG5 PGND VM GND VREF + 1.5V - 24V + - + - CHOP Oscillation circuit Regulator ST Charge pump ATT Output preamplifier stage RF1 + OUT1A OUT1B VMI VM2 OUT2A DC11 DC12 RF2 + CEM Overcurrent protection circuit TSD OUT2B DC21 DC22 EMM Output control logic Output preamplifier stage VG Output preamplifier stage CP2 Output preamplifier stage CP1 EMO2 EMO1 5V LV8773 Application Note Block Diagram 3/30 LV8773 Application Note Specifications Absolute Maximum Ratings at Ta = 25°C Parameter Symbol Conditions Ratings Unit Supply voltage VM max Output peak current IO peak Output current IO max Logic input voltage VIN EMO1/EMO2 input voltage Vemo/Vemo2 -0.3 to +6 V Allowable power dissipation Pd max1 1 unit 3.0 W Pd max2 * 6.2 W Tw ≤ 10ms, duty 20% 36 V 2.5 A 2 A -0.3 to +6 V Operating temperature Topr -20 to +85 °C Storage temperature Tstg -55 to +150 °C * Specified circuit board: 90.0mm×90.0mm×1.6mm, glass epoxy 2-layer board. Caution 1) Absolute maximum ratings represent the value which cannot be exceeded for any length of time. Caution 2) Even when the device is used within the range of absolute maximum ratings, as a result of continuous usage under high temperature, high current, high voltage, or drastic temperature change, the reliability of the IC may be degraded. Please contact us for the further details. Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. Recommended Operating Conditions at Ta = 25°C Parameter Symbol Conditions Ratings min typ Unit max Supply voltage range VM 9 32 V Logic input voltage VIN 0 5.5 V VREF input voltage range VREF 0 3 V Electrical Characteristics at Ta = 25°C, VM = 24V, VREF = 1.5V Parameter Standby mode current drain Symbol IMst Conditions Ratings min typ ST = “L” Unit max 100 400 μA mA Current drain IM ST = “H”, OE = “L”, with no load 3.2 5 VREG5 output voltage Vreg5 IO = -1mA 4.5 5 5.5 V Thermal shutdown temperature TSD Design guarantee 150 180 200 °C Thermal hysteresis width ΔTSD Design guarantee °C 40 Motor driver Output on resistance Ronu IO = 2A, Upper-side on resistance 0.3 0.4 Ω Rond IO = 2A, Lower-side on resistance 0.25 0.33 Ω 50 μA 1.2 1.4 V 4 8 12 μA 30 50 70 μA 0.8 V Output leakage current IOleak Diode forward voltage VD ID = -2A Logic pin input current IINL VIN = 0.8V IINH VIN = 5V Logic high-level input voltage VINH Logic low-level input voltage VINL Current setting comparator Vtatt0 ATT = L 0.291 0.3 0.309 V threshold voltage Vtatt1 ATT = H 0.143 0.15 0.157 V Chopping frequency Fchop Cchop = 220pF 36.3 45.4 54.5 kHz CHOP pin charge/discharge current Ichop 7 10 13 μA Chopping oscillation circuit Vtup 0.8 1 1.2 V threshold voltage Vtdown 0.4 0.5 0.6 V VREF pin input current Iref 2.0 V (current attenuation rate switching) VREF = 1.5V μA -0.5 Charge pump VG output voltage VG 28 28.7 29.8 V Continued on next page. 4/30 LV8773 Application Note Continued from preceding page. Rise time tONG Oscillator frequency Fosc VG = 0.1μF μS 200 90 125 7 10 0.8 1 150 kHz 400 mV 13 μA 1.2 V Output short-circuit protection EMO1/EMO2 pin saturation voltage Vsatemo Iemo = 1mA CEM pin charge current Icem Vcem = 0V CEM pin threshold voltage Vtcem 5/30 LV8773 Application Note 6/30 LV8773 Application Note Pin Functions Pin No. Pin Name Pin Function 4 ATT2 Motor holding current switching pin. 7 EMM Output short-circuit protection mode 10 DC22 Channel 2 output control input pin 2 11 DC21 Channel 2 output control input pin 1 12 DC12 Channel 1 output control input pin 2 13 DC11 Channel 1 output control input pin 1 Equivalent Circuit VREG5 switching pin. 10kΩ 100kΩ GND 14 ST Chip enable pin. VREG5 20kΩ 10kΩ 80kΩ GND 17 OUT2B Channel 2 OUTB output pin. 18, 25 PGND Power system ground. 19 VM2 Channel 2 motor power supply 20 RF2 21 OUT2A Channel 2 OUTA output pin. 22 OUT1B Channel 1 OUTB output pin. 23 RF1 Channel 1 current-sense resistor 19 24 connection pin. Channel 2 current-sense resistor connection pin. 24 VM1 Channel 1 motor power supply pin. 26 OUT1A Channel 1 OUTA output pin. 17 22 21 26 connection pin. 25 18 20 23 GND 27 VG Charge pump capacitor connection pin. 28 VM Motor power supply connection pin. 1 CP2 Charge pump capacitor connection pin. 2 CP1 Charge pump capacitor connection pin. 2 28 1 27 VREG5 GND 16 GND Ground. Continued on next page. 7/30 LV8773 Application Note Continued from preceding page. Pin No. 15 Pin Name VREF Pin Function Constant current control reference voltage input pin. Equivalent Circuit VREG5 GND 3 VREG5 Internal power supply capacitor connection pin. VM GND 5 EMO1 Channel 1 output short-circuit state VREG5 warning output pin. 9 EMO2 Channel 2 output short-circuit state warning output pin. GND 6 CEM Pin to connect the output short-circuit state detection time setting capacitor VREG5 GND 8 CHOP Copping frequency setting capacitor connection pin. VREG5 GND 8/30 LV8773 Application Note Description of operation (1) Chip enables function This IC is switched between standby and operating mode by setting the ST pin. In standby mode, the IC is set to power-save mode and all logic is reset. In addition, the internal regulator circuit and charge pump circuit do not operate in standby mode. ST Mode Internal regulator Low or Open Standby mode Standby Charge pump Standby High Operating mode Operating Operating (2) Output control logic input output mode DC11(21) DC12(22) OUT1(2)A OUT1(2)B L L OFF OFF H L H L CW ( Forward ) L H L H CCW ( reverse ) H H L L brake Stand-by The following show an output waveform at the time of the above logic setting. Forward⇔Brake No load , VM=24V , DC12=10kHz(DC11=H) 20us/div High High Low High DC11 5V/div DC12 5V/div OUTA 10V/div OUTB 10V/div Forward Brake Figure 12. Forward↔Brake control waveform Forward⇔Standby No load VM=24V, DC11=10 kHz (DC12=L) 20us/div High Low Low Low DC11 5V/div 0.5us/div DC12 5V/div w/out load (no current), even if the counterpart transistor is on, output turns off at a MIN time (≈1us) OUTA 10V/div OUTB 10V/div Forward Standby Counterpart transistor ON Standby mode turns on the counterpart transistor (synchronous rectification). After motor current fades off, output turns off. Synchronous rectification reduces heat generation compared to diode regeneration. Figure 13. Forward↔Standby control waveform 9/30 LV8773 Application Note Forward⇔Brake Stepping load VM=24V , DC12=10kHz(DC11=H) 20us/div Forward⇔Standby Stepping load VM=24V , DC11=10kHz(DC12=L) DC12⇔DC11 5V/div Forward 20us/div Forward Standby Brake Motor Current 2A/div ⇔200mA/div Current=0A OUTB⇔A 10V/div OUTA⇔B 10V/div Counterpart transistor ON Figure 14. Stepping load control waveform (3) Blanking period If, when exercising PWM constant-current chopping control over the motor current, the mode is switched from decay to charge, the recovery current of the parasitic diode may flow to the current sensing resistance, causing noise to be carried on the current sensing resistance pin, and this may result in erroneous detection. To prevent this erroneous detection, a blanking period is provided to prevent the noise occurring during mode switching from being received. During this period, the mode is not switched from charge to decay even if noise is carried on the current sensing resistance pin. This IC is the blanking time is fixed at approximately 2μs. (4) Chopping frequency setting For constant-current control, this IC performs chopping operations at the frequency determined by the capacitor (Cchop) connected between the CHOP pin and GND. The chopping frequency is set as shown below by the capacitor (Cchop) connected between the CHOP pin and GND. Fchop = Ichop/ (Cchop × Vtchop × 2) (Hz) Ichop: Capacitor charge/discharge current, typ 10μA Vtchop: Charge/discharge hysteresis voltage (Vtup-Vtdown), typ 0.5V For instance, when Cchop is 220pF, the chopping frequency will be as follows: Fchop = 10μA/ (220pF × 0.5V × 2) = 45.4 kHz The higher the chopping frequency is, the greater the output switching loss becomes. As a result, heat generation issue arises. The lower the chopping frequency is, the lesser the heat generation becomes. However, current ripple occurs. Since noise increases when switching of chopping takes place, you need to adjust frequency with the influence to the other devices into consideration. The frequency range should be between 40 kHz and 125 kHz. 10/30 LV8773 Application Note (5) Setting constant-current control When the current of the motor reaches up to a set current by setting the output current, this IC does the short brake control by the automatic operation so that the current should not increase more than it. Set current BLANKING time Coil current Chopping cycle Current mode CHARGE SLOW Based on the voltage input to the VREF pin and the resistance connected between RF and GND, the output current that is subject to the constant-current control is set using the calculation formula below: IOUT = (VREF/5)/RF resistance * The above setting is the output current at 100% of each excitation mode. Make sure to avoid using LV8773 with setting VREF open or out of the recommendation operating range. Such usage causes increased output current; therefore, you cannot set optimum constant current. If you do not perform current control (i.e. using LV8773 without setting saturation drive or current limit), set the voltages as follows: VREF=5V or VREF=VREG5 Since power dissipation of RF resistor is Pd=Iout2 x RF, make sure to take allowable power dissipation into consideration. The voltage input to the VREF pin can be switched to two-step settings depending on the statuses of the ATT. Attenuation function for VREF input voltage ATT Current setting reference voltage attenuation ratio Low 100% High 50% The formula used to calculate the output current when using the function for attenuating the VREF input voltage is given below. IOUT = (VREF/5) × (attenuation ratio)/RF resistance Example: At VREF of 1.5V, a reference voltage setting of 100% (ATT = L) and an RF resistance of 0.3Ω, the output current is set as shown below. IOUT = 1.5V/5 × 100%/0.3Ω = 1.0A If, in this state, ATT = H will be as follows: IOUT = 1.0A × 50% = 500mA In this way, the output current is attenuated when the motor holding current is supplied so that power can be conserved. 11/30 LV8773 Application Note (6) Output transistor operation mode Charge increases current. Switch from Charge to Slow Decay Current regeneration by Slow Decay Figure 15. Switching operation This IC controls constant current by performing chopping to output transistor. As shown above, by repeating the process from 1 to 3, setting current is maintained. Chopping consists of 2 modes: Charge/ Slow decay. In this IC, for switching mode (No.2), there are “off period” in upper and lower transistor to prevent crossover current between the transistors. This off period is set to be constant (≈ 0.375μs) which is controlled by the internal logic. The diagrams show parasitic diode generated due to structure of MOS transistor. When the transistor is off, output current is regenerated through this parasitic diode. Output Transistor Operation Function OUTA→OUTB (CHARGE) Output Tr U1 U2 L1 L2 CHARGE ON OFF OFF ON SLOW OFF OFF ON ON OUTB→OUTA (CHARGE) Output Tr U1 U2 L1 L2 CHARGE OFF ON ON OFF SLOW OFF OFF ON ON 12/30 LV8773 Application Note (7) Typical current waveform in each excitation mode when stepping motor parallel input control Full step (CW mode) DC11 DC12 DC21 DC22 （％） I1 100 0 （％）－100 100 I2 0 －100 Half step (CW mode) DC11 DC12 DC21 DC22 (%) 100 I1 0 －100 (%) 100 I2 0 －100 13/30 LV8773 Application Note (8)PWM control You can perform H-Bridge direct PWM control to DC11, DC12, DC21, and DC22 by inputting PWM signal. The maximum frequency of PWM signal is 200 kHz. However, dead zone is generated when On-Duty is around 0%. Make sure to select optimum PWM frequency according to the target control range. Input-Output Characteristics of H-Bridge(Reference data) VM=24V,VREF=1.5V Forward/Reverse<-->Brake Figure 16. PWM control characteristic 14/30 LV8773 Application Note The following show a waveform when it connected a motor. (DC Motor) VM=24V VREF=0.4V RF=0.22Ω ATT=L DC Motor 500us/div 5us/div DC11 5V/div High High DC12 5V/div Low Low Brush noise Brake Motor Current 0.5A/div Current limit Chopping cycle Forward Figure 17. Setting constant-current control waveform (DC motor) (Stepping Motor) VM=24V VREF=0.8V RF=0.22Ω ATT=L Stepping Motor (Full step) 10ms/div Low High DC11 5V/div DC21 5V/div Motor Current 0.5A/div 20us/div DC11 5V/div Low High Low DC21 5V/div Motor Current 0.2A/div Chopping cycle Figure 18. Setting constant-current control faveform (Stepping motor) 15/30 LV8773 Application Note (9) Output short-circuit protection function This IC incorporates an output short-circuit protection circuit that, when the output has been shorted by an event such as shorting to power or shorting to ground, sets the output to the standby mode and turns on the warning output in order to prevent the IC from being damaged. In the channels 1 and 2 operate independently. (Even if the output of channel 1 has been short-circuited, channel 2 will operate normally.) (9-1) Output short-circuit detection operation 1. High current flows if Tr3 and Tr4 are ON. 2. If RF voltage> setting voltage, then the mode switches to SLOW decay. 3.If the voltage between D and S of Tr4 exceeds the reference voltage for 2μs, short status is detected. VM short VM VM Tr1 Tr1 Tr3 ON OUTA OFF OUTA OFF OUTB M Tr2 OFF Tr3 Tr4 Tr2 ON ON OFF OUTB M Tr4 ON RF RF Short-circuit Detection (left schematic) 1.High current flows if Tr3 and Tr4 are ON 2. If the voltage between D and S of Tr1 exceeds the reference voltage for 2μs, short status is detected. GND short Short-circuit Detection VM Tr1 ON OUTA Tr3 M Tr2 OFF RF Load short Short-circuit Detection OFF OUTB VM Tr1 ON OUTA Tr4 Tr2 ON OFF Tr3 M OFF OUTB Tr4 ON RF (right schematic) 1. Without going through RF resistor, current control does not operate and current will continue to increase in CHARGE mode. 2. If the voltage between D and S of Tr1 exceeds the reference voltage for 2μs, short status is detected. 1. Without L load, high current flows. 2. If RF voltage> setting voltage, then the mode switches to SLOW decay. 3. During load short stay in SLOW decay mode, current does not flow and over current state is not detected. Then the mode is switched to FAST decay according to chopping cycle. 4. Since FAST state is short (≈1μs), switches to CHARGE mode before short is detected. 5. If voltage between D and S exceeds the reference voltage continuously during blanking time at the start of CHARGE mode (Tr1), CHARGE state is fixed (even if RF voltage exceeds the setting voltage, the mode is not switched to SLOW decay). After 2us or so, short is detected. 16/30 LV8773 Application Note (9-2) Output short-circuit protection detect current (Reference value) Short protection function operates when the following abnormal current flows into the output transistor. Ta = 25°C (typ) Output Transistor Io Upper-side Transistor 4.0A Lower-side Transistor 3.6A *RF=GND Figure 19. Detect current waveform (9-3) Output short-circuits protection operation changeover function Changeover to the output short-circuit protection of IC is made by the setting of EMM pin. EMM State Low or Open Latch method High Auto reset method 17/30 LV8773 Application Note (9-4) Latch type In the latch mode, when the output current exceeds the detection current level, the output is turned OFF, and this state is held. The detection of the output short-circuited state by the IC causes the output short-circuits protection circuit to be activated. When the short-circuited state continues for the period of time set using the internal timer (approximately 2μs), the output in which the short-circuiting has been detected is first set to OFF. After this, the output is set to ON again as soon as the timer latch time (Tcem) described later has been exceeded, and if the short-circuited state is still detected, all the outputs of the channel concerned are switched to the standby mode, and this state is held. This state is released by setting ST to low. Output ON Output ON H-bridge output state Output OFF Standby state Threshold voltage CEM voltage Short-circuit detection state Short- Release circuit Short-circuit Internal counter 1st counter start 1st counter stop 1st counter start 1st counter end 2nd counter start 2nd counter end (9-5) Auto reset type In the automatic reset mode, when the output current exceeds the detection current level, the output waveform changes to the switching waveform. As with the latch system, when the output short-circuited state is detected, the short-circuit protection circuit is activated. When the operation of the short-circuit detection circuit exceeds the timer latch time (Tcem) described later, the output is changed over to the standby mode and is reset to the ON mode again in 2ms (typ). In this event, if the over current mode still continues, the switching mode described above is repeated until the over current mode is canceled. 18/30 LV8773 Application Note (9-6) Timer latch time (Tcem) The time taken for the output to be set to OFF when the output has been short-circuited can be set using capacitor Ccem, connected between the CEM pin and GND. The value of capacitor Ccem is determined by the formula given below. Tcem ≈ Ccem × Vtcem/Icem [sec] Vtcem: Comparator threshold voltage, typ 1V Icem: CEM pin charge current, typ 10μA Timer latch: Tcem When you do not connect CEM capacitor (CEM=open) and short state continues for 2us, output turns OFF. Standby mode is set if short state continues even after the output is turn ON again. Latch type Auto reset type 1ms/div 5us/div OUT 10V/div OUT-GND short st 1 counter 2us 1V nd 2 counter CEM 0.5V/div 2ms CEM charge EMO1 5V/div Figure 20. CEM operation waveform (9-7) Unusual condition warning output pins (EMO1, EMO2) The LV8773 is provided with the EMO pin which notifies the CPU of an unusual condition if the protection circuit operates by detecting an unusual condition of the IC. This pin is of the open-drain output type and when an unusual condition is detected, the EMO output is placed in the ON (EMO = Low) state. The EMO1 pin and the EMO2 pin output unusual condition on 2ch side/ 1ch side respectively. Furthermore, the EMO (EMO2) pin is placed in the ON state when one of the following conditions occurs. 1. Shorting-to-power, shorting-to-ground, or shorting-to-load occurs at the output pin and the output short-circuit protection circuit is activated. 2. The IC junction temperature rises and the thermal protection circuit is activated. Unusual condition Channel 1 short-circuit detected EMO1 EMO2 ON - Channel 2 short-circuit detected - ON Overheating condition detected ON ON 19/30 LV8773 Application Note (10) Charge Pump Circuit When the ST pin is set high, the charge pump circuit operates and the VG pin voltage is boosted from the VM voltage to the VM + VREG5 voltage. Begin the drive of the motor after the time of tONG or more because it doesn't turn on the output if the voltage of the VG pin is not pressured to VM+4V or more. ST VG pin voltage VM+VREG5 VM+4V VM tONG VG Pin Voltage Schematic View VG voltage is used to drive upper output FET and VREG5 voltage is used to drive lower output FET. Since VGvoltage is equivalent to the addition of VM and VREG5 voltage, VG capacitor should allow higher voltage. The capacitor between CP1 and CP2 is used to boost charge pump. Since CP1 oscillates with 0V↔VREG5 and CP2 with VM↔VM + VREG5, make sure to allow enough capacitance between CP1 and CP2. Since the capacitance is variable depends on motor types and driving methods, please check with your application before you define constant to avoid ripple on VGvoltage. (Recommended value) VG: 0.1uF CP1-CP2: 0.1uF VM=24V CP1-CP2=0.1uF VG=0.1uF/0.22uF/1uF VM=24V CP1-CP2=0.1uF VG=0.1uF tONG Startup time with different VG capacitor 50μs/div ST 5V/div VM+4V 500μs/div VG 5V/div Vout 10V/div 0.1uF/300us 0.22uF/620us 1uF/2.9ms tONG Figure 21. VG voltage pressure waveform 20/30 LV8773 Application Note (11) Thermal shutdown function The thermal shutdown circuit is incorporated and the output is turned off when junction temperature Tj exceeds 180°C and the abnormal state warning output is turned on. As the temperature falls by hysteresis, the output turned on again (automatic restoration). The thermal shutdown circuit does not guarantee the protection of the final product because it operates when the temperature exceed the junction temperature of Tjmax=150°C. TSD = 180°C (typ) ΔTSD = 40°C (typ) 21/30 LV8773 Application Note Application Circuit Example • Stepping motor driver circuit The formulae for setting the constants in the examples of the application circuits above are as follows: Constant current (100%) setting When VREF = 1.5V IOUT = VREF/5/RF resistance = 1.5V/5/0.3Ω = 1.0A Chopping frequency setting Fchop = Ichop/ (Cchop × Vtchop × 2) = 10μA/ (220pF × 0.5V × 2) = 45.4 kHz Timer latch time when the output is short-circuited Tcem = Ccem × Vtcem/Icem = 100pF × 1V/10μA = 10μs 22/30 LV8773 Application Note • DC motor driver circuit (Constant current control function is used.) The formulae for setting the constants in the examples of the application circuits above are as follows: Constant current limit (100%) setting When VREF = 1.5V Ilimit = VREF/5/RF resistance = 1.5V/5/0.3Ω = 1.0A Chopping frequency setting Fchop = Ichop/ (Cchop × Vtchop × 2) = 10μA/ (220pF × 0.5V × 2) = 45.4 kHz Timer latch time when the output is short-circuited Tcem = Ccem × Vtcem/Icem = 100pF × 1V/10μA = 10μs 23/30 LV8773 Application Note • DC motor parallel connection By connecting OUT1A and OUT2A as well as OUT2A and OUT2B, you can double the current capability. However, you cannot use current limit function. (RF=GND) The formulae for setting the constants in the examples of the application circuits above are as follows: Constant current limit (100%) setting When VREF = 1.5V Ilimit = VREF/5 = 1.5V/5 = 0.3A Chopping frequency setting Fchop = Ichop/ (Cchop × Vtchop × 2) = 10μA/ (220pF × 0.5V × 2) = 45.4 kHz Timer latch time when the output is short-circuited Tcem = Ccem × Vtcem/Icem = 100pF × 1V/10μA = 10μs 24/30 LV8773 Application Note Allowable power dissipation The pad on the backside of the IC functions as heatsink by soldering with the board. Since the heat-sink characteristics vary depends on board type, wiring and soldering, please perform evaluation with your board for confirmation. Pd max - Ta Allowable power dissipation, Pd max - W 8.0 6.2 6.0 Specified bord:90.0mm × 90.0mm × 1.6mm3 2 Layer glass epoxy with substrate 4.0 3.0 1 unit 3.2 2.0 1.5 0 —20 0 20 40 60 80 100 Ambient temperature, Ta - C Substrate Specifications (Substrate recommended for operation of LV8773) Size : 90mm × 90mm × 1.6mm (two-layer substrate [2S0P]) Material : Glass epoxy 25/30 LV8773 Application Note Evaluation board LV8773 (90.0mm×90.0mm×1.6mm, glass epoxy 2-layer board) C2 C4 C5 R2 R1 C1 C3 R3 R4 Front side Back side Bill of Materials for LV8773 Evaluation Board Manufacturer Manufacturer Part Number Substitution Allowed Lead Free ±10% Murata GRM188R72A104KA35* Yes Yes 0.1µF, 100V ±10% Murata GRM188R72A104KA35* Yes Yes 0.1µF, 100V ±10% Murata GRM188R72A104KA35* Yes Yes 100pF, 50V ±5% Murata GRM1882C1H101JA01* Yes Yes 180pF, 50V ±5% Murata GRM1882C1H181JA01* Yes Yes 10µF, 50V ±20% SUN Electronic Industries 50ME10HC Yes Yes 47kΩ, 1/10W ±5% KOA RK73B1JT**473J Yes Yes 47kΩ, 1/10W ±5% KOA RK73B1JT**473J Yes Yes 0.22Ω, 1W ±5% ROHM MCR100JZHJLR22 Yes Yes 0.22Ω, 1W ±5% ROHM MCR100JZHJLR22 Yes Yes ON Semiconductor LV8773 No Yes MS-621 C-A01 MIYAMA MS-621C-A01 Yes Yes ST-1-3 MAC8 ST-1-3 Yes Yes Designator Quantity Description Value Tolerance C1 1 Capacitor for Charge pump 0.1µF, 100V C2 1 C3 1 Capacitor for Charge pump 5VREG stabilization Capacitor C4 1 C5 1 Capacitor to set CEM timer Capacitor to set chopping frequency C6 1 R1 1 R2 1 R3 1 R4 1 VM Bypass Capacitor Pull-up Resistor for terminal EMO1 Pull-up Resistor for terminal EMO2 Channel 1 output current detective Resistor Channel 2 output current detective Resistor IC1 1 Motor Driver SW1-SW7 7 Switch TP1-TP20 20 Test Point Footprint DIP28HC (500mil) 26/30 LV8773 Application Note Evaluation board circuit 0.1uF 10uF 1 CP2 VM 28 2 CP1 VG 27 C1 0.1uF C6 0.1uF R2 47kΩ R2 47kΩ SW1 100pF 5 EMO1 VM1 24 6 CEM RF1 23 SW2 7 EMM 8 CHOP C4 9 EMO2 SW3 SW4 SW5 SW6 * VDD Power supply input terminal for Switch SW7 LV8773 180pF PGND 25 4 ATT C3 *VM Power supply input terminal OUT1A 26 3 VREG5 C2 C7 0.22Ω R3 OUT1B 22 OUT2A 21 0.22Ω RF2 20 10 DC22 VM2 19 11 DC21 PGND 18 12 DC12 OUT2B 17 13 DC11 GND 16 14 ST Motor connection terminal R4 Motor connection terminal VREF 15 * VREF Constant Current Control for Reference Voltage 2us/div DC12 5V/div OUT1A 10V/div OUT1B 10V/div 【DC Motor(OUT1A-OUT1B)】 VM=24V,VDD=5V,VREF=1.5V ST=H,EMM=L,ATT=L DC21=DC22=L DC11=H DC12=100 kHz (Duty50%) Iout1 1A/div 20ms/div 20ms/div DC11 5V/div DC21 5V/div Iout1B 0.5A/div Iout1A 0.5A/div 【Stepping Motor (Full step)】 VM=24V,VDD=5V,VREF=0.8V,ST=H,EMM=L,ATT=L DC11=DC21=100Hz (Duty50%) DC12=the reverse pulse of DC11 DC22=the reverse pulse of DC21 【Stepping Motor (half step)】 VM=24V,VDD=5V,VREF=0.8V,ST=H,EMM=L,ATT=L DC11=DC21=200Hz (Duty37.5%) DC12=the reverse pulse of DC11 DC22=the reverse pulse of DC21 27/30 LV8773 Application Note Evaluation Board Manual [Supply Voltage] VM (9 to 32V): Power Supply for LSI VREF (0 to 3V): Const. Current Control for Reference Voltage VDD (2 to 5V): Logic “High” voltage for toggle switch [Toggle Switch State] Upper Side: High (VDD) Middle: Open, enable to external logic input Lower Side: Low (GND) [Operation Guide] For stepping motor control 1. Initial Condition Setting: Set “Open or Low” the switches. 2. Motor Connection: Connect the Motors between OUT1A and OUT1B, between OUT2A and OUT2B. 3. Power Supply: Supply DC voltage to VM, VREF and VDD. 4. Ready for Operation from Standby State: Turn “High” the ST terminal toggle switch. Channel 1 and 2 are into 2-phase excitement initial position (100%, -100%). 5. Motor Operation: Input the pulse signal into the terminal DC11, DC12, DC21, and DC22. 6. Other Setting (See Application Note for detail) i. ATT: Motor current attenuation. ii. EMM: Short circuit protection mode change. For DC motor control 1. Initial Condition Setting: Set “Open or Low” the switches 2. Motor Connection: Connect the Motor(s) between OUT1A and OUT1B, between OUT2A and OUT2B. 3. Power Supply: Supply DC voltage to VM, VREF and VDD. 4. Ready for Operation from Standby State: Turn “High” the ST terminal toggle switch. 5. Motor Operation: Set DC11, DC12 and DC22 terminals according to the purpose. 6. Other Setting (See Application Note for detail) i. ATT: Motor current attenuation. ii. EMM: Short circuit protection mode change. [Setting for External Component Value] 1. Constant Current (100%) At VREF=1.5V Iout =VREF [V] / 5 / RF [ohm] =1.5 [V] / 5 / 0.22 [ohm] =1.36 [A] 2. Chopping Frequency Fchop =Ichop [uA] / (Cchop x Vt x 2) =10 [uA] / (180 [pF] x 0.5 [V] x 2) =55 [kHz] 3. Short Protection Latch Time Tscp =CEM [pF] x VT [V] / Ichg [uA] =100 [pF] x 1 [V] / 10 [uA] =10 [uS] 28/30 LV8773 Application Note Warning: ●Power supply connection terminal [VM, VM1, VM2] 9 Make sure to short-circuit VM, VM1 and VM2.For controller supply voltage, the internal regulator voltage of VREG5 (typ 5V) is used. 9 Make sure that supply voltage does not exceed the absolute MAX ratings under no circumstance. Noncompliance can be the cause of IC destruction and degradation. 9 Caution is required for supply voltage because this IC performs switching. 9 The bypass capacitor of the power supply should be close to the IC as much as possible to stabilize voltage. Also if you intend to use high current or back EMF is high, please augment enough capacitance. ●GND terminal [GND, PGND] 9 Since GND is the reference of the IC internal operation, make sure to connect to stable and the lowest possible potential. Since high current flows into PGND, connect it to one-point GND. ●Internal power supply regulator terminal [VREG5] 9 VREG5 is the power supply for logic (typ 5V). 9 When VM supply is powered and ST is”H”, VREG5 operates. 9 Please connect capacitor for stabilize VREG5. The recommendation value is 0.1uF. 9 Since the voltage of VREG5 fluctuates, do not use it as reference voltage that requires accuracy. ●Input terminal 9 The logic input pin incorporates pull-down resistor (100kΩ). 9 When you set input pin to low voltage, please short it to GND because the input pin is vulnerable to noise. 9 The input is TTL level (H: 2V or higher, L: 0.8V or lower). 9 VREF pin is high impedance. ●OUT terminal [OUT1A, OUT1B, OUT2A, OUT2B] 9 During chopping operation, the output voltage becomes equivalent to VM voltage, which can be the cause of noise. Caution is required for the pattern layout of output pin. 9 The layout should be low impedance because driving current of motor flows into the output pin. 9 Output voltage may boost due to back EMF. Make sure that the voltage does not exceed the absolute MAX ratings under no circumstance. Noncompliance can be the cause of IC destruction and degradation. ●Current sense resistor connection terminal [RF1, RF2] 9 To perform constant current control, please connect resistor to RF pin. 9 To perform saturation drive (without constant current control), please connect RF pin to GND. 9 If RF pin is open, then short protector circuit operates. Therefore, please connect it to resistor or GND. 9 The motor current flows into RF – GND line. Therefore, please connect it to common GND line and low impedance line. 29/30 LV8773 Application Note ON Semiconductor and the ON logo are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of SCILLC’s product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent-Marking.pdf. SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner. 30/30