LV8774Q Bi-CDMOS LSI PWM Constant-Current Control Stepper Motor Driver www.onsemi.com Overview The LV8774 is a 2-channel H-bridge driver IC, and can drive a stepper motor or two brushed DC motors. A stepper motor driver supports micro-step drive with 1/16-step resolution, and two brushed motor drivers support forward, reverse, brake, and standby functions. It is ideally suited for driving brushed DC motors and stepper motors used in office equipment and amusement applications. Feature VQFN44L ( 6x6 ) Single-channel PWM current control stepper motor driver (or two DC motor driver) BiCDMOS process IC Low on resistance (upper side : 0.3 ; lower side : 0.25 ;total of upper and lower : 0.55 ; Ta = 25C, IO = 2A) Micro-step mode can be set to Full-step, Half-step, Quarter-step , or 1/16-step Excitation step proceeds only by step signal input with stepper motor Motor current selectable in four steps Output short-circuit protection circuit (selectable from latch-type or auto-reset-type) Unusual condition warning output pins No control power supply required Typical Applications Stepper/Brush DC Motors , Computing & Peripherals , Industrial Printers , Document Scanner , PoE Security Camera , Slot Machine , Vending Machine ,etc Specifications Absolute Maximum Ratings at Ta = 25C Parameter Symbol Conditions Ratings Unit Supply voltage VM max VM , VM1 , VM2 36 V Output peak current IO peak Tw 10ms , duty 20% , Per 1ch 2.5 A Output current IO max Per 1ch 2 A Logic input voltage VIN ATT1, ATT2, EMM, RST/BLK, STEP/DC22, -0.3 to +6 V FR/DC21, MD2/DC12, MD1/DC11, DM, OE, ST MONI/EMO input voltage Vmoni/Vemo Allowable power dissipation Pd max -0.3 to +6 V 3.60 W Operating temperature Storage temperature Topr -20 to +85 C Tstg -55 to +150 C * *Specified circuit board : 57.0mmx57.0mmx1.6mm, glass epoxy 4-layer board, with backside mounting. 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 those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality should not be assumed, damage may occur and reliability may be affected. ORDERING INFORMATION See detailed ordering and shipping information on page 28 of this data sheet. © Semiconductor Components Industries, LLC, 2015 June 2015 - Rev. 2 1 Publication Order Number : LV8774Q/D LV8774Q Recommended Operating Conditions at Ta = 25C Parameter Symbol Conditions Ratings Unit Supply voltage range VM VM , VM1 , VM2 9 to 32 V Logic input voltage VIN ATT1 , ATT2 , EMM , RST/BLK , STEP/DC22 , 0 to 5.5 V 0 to 3 V FR/DC21 , MD2/DC12 , MD1/DC11 , DM , OE , ST VREF input voltage range VREF Functional operation above the stresses listed in the Recommended Operating Ranges is not implied. Extended exposure to stresses beyond the Recommended Operating Ranges limits may affect device reliability. Electrical Characteristics at Ta = 25°C, VM = 24V, VREF = 1.5V Parameter Symbol Conditions Ratings min typ Unit max Standby mode current drain IMst ST = “L” , I(VM)+I(VM1)+I(VM2) 100 400 A Current drain IM ST = “H”, OE = “L”, with no load 3.2 5 mA 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 TSD Design guarantee I(VM)+I(VM1)+I(VM2) C 40 Motor driver Output on resistance Ronu IO = 2A, Upper-side on resistance 0.3 0.4 Rond IO = 2A, Lower-side on resistance 0.25 0.33 50 A 1.2 1.4 V 4 8 12 A 30 50 70 A Output leakage current IOleak Diode forward voltage VD ID = -2A Logic pin input current IINL ATT1 , ATT2 , EMM , RST/BLK , STEP/DC22 , FR/DC21 , MD2/DC12 , IINH MD1/DC11 , DM , OE , ST , VIN = 0.8V ATT1 , ATT2 , EMM , RST/BLK , STEP/DC22 , FR/DC21 , MD2/DC12 , MD1/DC11 , DM , OE , ST , VIN = 5V Logic input voltage High VINh ATT1 , ATT2 , EMM , RST/BLK , Low VINl STEP/DC22 , FR/DC21 , MD2/DC12 , Current setting 1/16 step Vtdac0_4W Step 0 (When initialized : channel 1 comparator resolution 2.0 5.5 V 0 0.8 V 0.309 V MD1/DC11 , DM , OE , ST 0.291 0.3 comparator level) threshold voltage Vtdac1_4W Step 1 (Initial state+1) 0.291 0.3 0.309 V (current step Vtdac2_4W Step 2 (Initial state+2) 0.285 0.294 0.303 V Vtdac3_4W Step 3 (Initial state+3) 0.279 0.288 0.297 V Vtdac4_4W Step 4 (Initial state+4) 0.267 0.276 0.285 V Vtdac5_4W Step 5 (Initial state+5) 0.255 0.264 0.273 V Vtdac6_4W Step 6 (Initial state+6) 0.240 0.249 0.258 V Vtdac7_4W Step 7 (Initial state+7) 0.222 0.231 0.240 V Vtdac8_4W Step 8 (Initial state+8) 0.201 0.21 0.219 V Vtdac9_4W Step 9 (Initial state+9) 0.180 0.189 0.198 V Vtdac10_4W Step 10 (Initial state+10) 0.157 0.165 0.173 V Vtdac11_4W Step 11 (Initial state+11) 0.134 0.141 0.148 V Vtdac12_4W Step 12 (Initial state+12) 0.107 0.114 0.121 V Vtdac13_4W Step 13 (Initial state+13) 0.080 0.087 0.094 V Vtdac14_4W Step 14 (Initial state+14) 0.053 0.06 0.067 V switching) Quarter step Vtdac15_4W Step 15 (Initial state+15) 0.023 0.03 0.037 V Vtdac0_W Step 0 (When initialized : channel 1 0.291 0.3 0.309 V 0.276 0.285 V resolution comparator level) Vtdac4_W Step 4 (Initial state+1) 0.267 Vtdac8_W Step 8 (Initial state+2) 0.201 0.21 0.219 V Vtdac12_W Step 12 (Initial state+3) 0.107 0.114 0.121 V Continued on next page www.onsemi.com 2 LV8774Q Continued from preceding page. Parameter Current setting Half step comparator resolution threshold voltage Symbol Vtdac0_H Conditions Step 0 (When initialized : channel 1 Ratings min typ Unit max 0.291 0.3 0.309 V comparator level) Vtdac8_H Step 8 (Initial state+1) 0.201 0.21 0.219 V Vtdac8_F Step 8' (When initialized : channel 1 0.291 0.3 0.309 V Current setting comparator Vtatt00 ATT1 = L, ATT2 = L 0.291 0.3 0.309 V threshold voltage Vtatt01 ATT1 = H, ATT2 = L 0.232 0.24 0.248 V Vtatt10 ATT1 = L, ATT2 = H 0.143 0.15 0.157 V Vtatt11 ATT1 = H, ATT2 = H 0.053 0.06 0.067 V Chopping frequency Fchop Cchop = 200pF 40 50 60 kHz CHOP pin charge/discharge current Ichop 7 10 13 A Chopping oscillation circuit Vtup 0.8 1 1.2 V threshold voltage Vtdown 0.4 0.5 0.6 V 400 mV (current step Full step switching) resolution (current attenuation rate switching) comparator level) VREF pin input current Iref VREF = 1.5V MONI pin saturation voltage Vsatmon Imoni = 1mA A -0.5 Charge pump VG output voltage VG Rise time tONG Oscillator frequency Fosc 28 VG = 0.1F , Between CP1-CP2 0.1uF 28.7 29.8 V 200 500 S 125 150 kHz 400 mV ST=”H” →VG=VM+4V 90 Output short-circuit protection EMO pin saturation voltage Vsatemo Iemo = 1mA CEM pin charge current Icem Vcem = 0V CEM pin threshold voltage Vtcem 7 10 13 A 0.8 1 1.2 V Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product performance may not be indicated by the Electrical Characteristics if operated under different conditions. www.onsemi.com 3 LV8774Q Package Dimensions unit : mm (typ) VQFN44L(6mm x 6mm) Pdmax-Ta www.onsemi.com 4 LV8774Q Substrate Specifications (Substrate recommended for operation of LV8774Q) Size : 57mm × 57mm × 1.6mm (four-layer substrate) Material : Glass epoxy Copper wiring density : L1 = 75% / L4 = 85% L1 : Copper wiring pattern diagram L4 : Copper wiring pattern diagram Cautions 1) The data for the case with the back side mounted shows the values when 90% or more of the Exposed Die-Pad is wet. 2) For the set design, employ the derating design with sufficient margin. Stresses to be derated include the voltage, current, junction temperature, power loss, and mechanical stresses such as vibration, impact, and tension. Accordingly, the design must ensure these stresses to be as low or small as possible. The guideline for ordinary derating is shown below : (1)Maximum value 80% or less for the voltage rating (2)Maximum value 80% or less for the current rating (3)Maximum value 80% or less for the temperature rating 3) After the set design, be sure to verify the design with the actual product. Confirm the solder joint state and verify also the reliability of solder joint for the Exposed Die-Pad, etc. Any void or deterioration, if observed in the solder joint of these parts, causes deteriorated thermal conduction, possibly resulting in thermal destruction of IC. www.onsemi.com 5 MONI CHOP EMM CEM EMO ATT1 OUT1B OUT1B RF1 RF1 NC NC OUT2A FR/DC21 STEP/DC22 RF2 RST/BLK MD2/DC12 RF2 OUT2A MD1/DC11 NC LV8774Q Pin Assignment VQFN44L(6mm×6mm ) www.onsemi.com 6 MONI PGND VM www.onsemi.com 7 GND VREF VREG5 + - LVS TSD + - CHOP Oscillation circuit Regulator ATT2 Attenuator (4 levels selectable) ST ATT1 Charge pump Output preamplifier stage RF OUT B VM VM2 OUT2A RF2 DM EMM Current selection (4W1-2/ W1-2/1-2/2) Current selection (4W1-2/ W1-2/1-2/2) MD1/ MD2/ FR/ STEP/ RST/ OE DC11 DC12 DC21 DC22 BLK + Output control logic OUT2B + OUT A Output preamplifier stage VG Output preamplifier stage CF Output preamplifier stage CP2 CEM EMO LV8774Q Block Diagram LV8774Q Pin Functions Pin No. Pin Name Pin Function 22 ATT2 Motor holding current switching pin. 23 ATT1 Motor holding current switching pin. 26 EMM Output short-circuit protection mode 29 RST/BLK 30 STEP/DC22 31 FR/DC21 Equivalent Circuit VREG5 switching pin. RESET input pin (STM) / Blanking time switching pin (DCM). STEP signal input pin (STM) / Channel 2 output control input pin 2 (DCM). CW / CCW signal input pin (STM) / 10kΩ Channel 2 output control input pin 1 (DCM). 32 MD2/DC12 Excitation mode switching pin 2 (STM) / 100kΩ Channel 1 output control input pin 2 (DCM). 33 MD1/DC11 Excitation mode switching pin 1 (STM) / Channel 1 output control input pin 1 GND (DCM). 35 DM Drive mode (STM/DCM) switching pin. 36 OE Output enable signal input pin. 37 ST Chip enable pin. VREG5 20kΩ 10kΩ 80kΩ GND 40, 41 OUT2B Channel 2 OUTB output pin. 14, 42 PGND Power system ground. 43, 44 VM2 Channel 2 motor power supply 2, 3 RF2 5, 6 OUT2A Channel 2 OUTA output pin. 7, 8 OUT1B Channel 1 OUTB output pin. 9, 10 RF1 Channel 1 current-sense resistor 12 13 43 44 connection pin. Channel 2 current-sense resistor connection pin. 15 16 5 connection pin. 12, 13 VM1 Channel 1 motor power supply pin. 15, 16 OUT1A Channel 1 OUTA output pin. 7 8 6 40 41 14 42 9 10 2 3 Continued on next page. www.onsemi.com 8 LV8774Q Continued from preceding page. Pin No. Pin Name Pin Function 17 VG Charge pump capacitor connection pin. 18 VM Motor power supply connection pin. 19 CP2 Charge pump capacitor connection pin. 20 CP1 Charge pump capacitor connection pin. 38 VREF Equivalent Circuit 20 Constant current control reference 18 19 17 VREG5 voltage input pin. 500Ω GND 21 VREG5 Internal power supply capacitor VM connection pin. 2kΩ 78kΩ 26kΩ GND 24 EMO Output short-circuit state warning output VREG5 pin. 28 MONI Position detection monitor pin. GND Continued on next page. www.onsemi.com 9 LV8774Q Continued from preceding page. Pin No. 25 Pin Name CEM Pin Function Equivalent Circuit Pin to connect the output short-circuit VREG5 state detection time setting capacitor. GND 27 CHOP Chopping frequency setting capacitor VREG5 connection pin. 500Ω GND 39 1,4,11, 34 ExposedPad GND NC Ground. No Connection (No internal connection to the IC) Exposed-Pad connects signal GND or floating.* *Recommendation is to connect Exposed-pad to signal GND. Since IC may generate heat when using it by floating, be careful of a thermal design enough. www.onsemi.com 10 500Ω LV8774Q Description of operation 1. Input Pin Function Each input terminal has the function to prevent the flow of the current from an input to a power supply. Therefore, Even if a power supply (VM) is turned off in the state that applied voltage to an input terminal, the electric current does not flow into the power supply. 1-1) Chip enable 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 Charge pump Low or Open Standby mode Standby Standby High Operating mode Operating Operating 1-2) Drive mode switching pin function The IC drive mode is switched by setting the DM pin. In STM mode, stepper motor channel 1 can be controlled by the CLK-IN input. In DCM mode, DC motor channel 2 or stepper motor channel 1 can be controlled by parallel input. Stepper motor control using parallel input is Full-step or Half-step full torque. DM Drive mode Application Low or Open STM mode Stepper motor channel 1 (CLK-IN) High DCM mode DC motor channel 2 or stepper motor channel 1 (parallel) 2. STM mode (DM = Low or Open) 2-1) STEP pin function Input Operating mode ST STP Low * Standby mode High Excitation step proceeds High Excitation step is kept 2-2) Excitation mode setting function MD1 MD2 Micro-step resolution (Excitation mode) Initial position Channel 1 Channel 2 Low Low Full step(2 phase excitation) 100% -100% High Low Half step(1-2 phase excitation) 100% 0% Low High Quarter step 100% 0% 100% 0% (W1-2 phase excitation) High High 1/16 step(4W1-2 phase excitation) This is the initial position of each excitation mode in the initial state after power-on and when the counter is reset. 2-3) Position detection monitoring function The MONI position detection monitoring pin is of an open drain type. When the excitation position is in the initial position, the MONI output is placed in the ON state. (Refer to "2-12.Examples of current waveforms in each micro-step mode.") www.onsemi.com 11 LV8774Q 2-4) Setting constant-current control reference current This IC is designed to automatically exercise PWM constant-current chopping control for the motor current by setting the output current. 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. The voltage input to the VREF pin can be switched to four-step settings depending on the statuses of the two inputs, ATT1 and ATT2. This is effective for reducing power consumption when motor holding current is supplied. Attenuation function for VREF input voltage ATT1 ATT2 Current setting reference voltage attenuation ratio Low Low 100% High Low 80% Low High 50% High High 20% 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% [(ATT1, ATT2) = (L, L)] and an RF resistance of 0.3, the output current is set as shown below. IOUT = 1.5V/5 × 100%/0.3 = 1.0A If, in this state, (ATT1, ATT2) is set to (H, H), IOUT will be as follows : IOUT = 1.0A × 20% = 200mA In this way, the output current is attenuated when the motor holding current is supplied so that power can be conserved. 2-5) Input Timing TstepH TstepL STEP Tdh Tds (md1 step) (step md1) MD1 Tdh Tds (md2 step) (step md2) MD2 Tdh Tds (fr step) (step fr) FR TstepH/TstepL : Clock H/L pulse width (min 500ns) Tds : Data set-up time (min 500ns) Tdh : Data hold time (min 500ns) 2-6) Blanking period During normal operation switching transient noise from the parasitic diode may flow to the current sensing resistance, resulting in erroneous detection. To prevent this erroneous detection, a blanking period is provided to prevent the noise from being received. In the stepper motor driver mode (DM = Low or Open) of this IC, the blanking time is fixed at approximately 1s. In the DC motor driver mode (DM = High), the blanking time can be switched to one of two levels using the RST/BLK pin. (Refer to "Blanking time switching function.") www.onsemi.com 12 LV8774Q 2-7) Reset function RST Operating mode Low Normal operation High Reset state RST RESET STEP MONI 1ch output 0% 2ch output Initial state When the RST pin is set to High, the excitation position of the output is forcibly set to the initial state, and the MONI output is placed in the ON state. When RST is then set to Low, the excitation position is advanced by the next STEP input. 2-8) Output enable function OE Operating mode Low Output ON High Output OFF OE Power save mode STEP MONI 1ch output 0% 2ch output Output is high-impedance When the OE pin is set High, the output is forced OFF and goes to high impedance. The internal logic circuits remain operating, and the excitation position proceeds when the STEP signal is inputted. www.onsemi.com 13 LV8774Q 2-9) Forward/reverse switching function FR Operating mode Low Clockwise (CW) High Counter-clockwise (CCW) FR CW mode CCW mode CW mode STEP Excitation position (1) (2) (3) (4) (5) (6) (5) (4) (3) (4) (5) 1ch output 2ch output The internal D/A converter proceeds by one bit at the rising edge of the input STEP pulse. In addition, CW and CCW mode are switched by setting the FR pin. In CW mode, the channel 2 current phase is delayed by 90° relative to the channel 1 current. In CCW mode, the channel 2 current phase is advanced by 90° relative to the channel 1 current. 2-10) 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 10A Vtchop : Charge/discharge hysteresis voltage (Vtup-Vtdown), typ 0.5V For instance, when Cchop is 200pF, the chopping frequency will be as follows : Fchop = 10A/ (200pF × 0.5V × 2) = 50kHz www.onsemi.com 14 LV8774Q 2-11) Output current vector locus (one step is normalized to 90 degrees) 100.0 θ0 θ1 θ2 θ8' (2-phase) θ3 θ4 θ5 θ6 Channel 1 phase current ratio (%) θ7 θ8 66.7 θ9 θ 10 θ 11 θ 12 33.3 θ 13 θ 14 θ 15 θ 16 0.0 0.0 33.3 66.7 100.0 Channel 2 current ratio (%) Setting current ration in each micro-step mode STEP 1/16 step (%) Channel 1 Quarter step (%) Channel 2 Channel 1 0 100 0 1 100 10 2 98 20 3 96 29 4 92 38 5 88 47 6 83 55 7 77 63 8 70 70 9 63 77 10 55 83 11 47 88 12 38 92 13 29 96 14 20 98 15 10 100 16 0 100 Half step (%) Channel 2 Channel 1 100 0 92 38 70 70 38 92 0 100 www.onsemi.com 15 Full step (%) Channel 2 Channel 1 100 0 70 70 0 100 100 Channel 2 100 LV8774Q 2-12) Examples of current waveforms in each micro-step mode Full step (CW mode) STEP MONI (%) 100 l1 0 -100 (%) 100 I2 0 -100 Half step (CW mode) STEP MONI (%) 100 I1 0 -100 (%) 100 I2 0 -100 www.onsemi.com 16 LV8774Q Quarter step (CW mode) STEP MONI (%) 100 I1 0 -100 (%) 100 I2 0 -100 1/16 step (CW mode) STEP MONI (%) 100 50 I1 0 -50 -100 (%) 100 50 I2 0 -50 -100 www.onsemi.com 17 LV8774Q 2-13) Current control operation specification (Sine wave increasing direction) STEP Set current Set current Coil current Forced CHARGE section fchop Current mode CHARGE SLOW FAST CHARGE SLOW FAST (Sine wave decreasing direction) STEP Set current Coil current Forced CHARGE section Set current fchop Current mode CHARGE SLOW Forced CHARGE section FAST FAST CHARGE SLOW For current mode control, the operation sequence is as described below : At rise of chopping frequency, the CHARGE mode begins. (During blanking time the CHARGE mode is forced regardless of the magnitude of the coil current (ICOIL) and set current (IREF).) The coil current (ICOIL) and set current (IREF) are compared in this blanking time. When (ICOIL < IREF) the winding is charged until ICOIL IREF, then changed to the SLOW DECAY mode, and finally to the FAST DECAY mode for approximately 1s. When (ICOIL IREF) the FAST DECAY mode begins immediately. The coil current is attenuated in the FAST DECAY for one cycle. Above operations are repeated. Normally, the SLOW (+FAST) DECAY mode continues in the sine wave increasing direction, then entering the FAST DECAY mode till the current is attenuated to the set level, followed by the SLOW DECAY mode. www.onsemi.com 18 LV8774Q 3. DCM Mode (DM=High) 3-1) DCM mode output control logic Parallel input Output Mode DC11 (21) DC12 (22) OUT1 (2) A OUT1 (2) B Low Low OFF OFF Standby High Low High Low CW (Forward) Low High Low High CCW (Reverse) High High Low Low Brake 3-2) Blanking time switching function BLK Blanking time Low 2s High 3s 3-3) Output enable function OE Operating mode Low Output ON High Output OFF When the OE pin is set High, the output is forced OFF and goes to high impedance. When the OE pin is set Low, output conforms to the control logic. www.onsemi.com 19 LV8774Q 3-4) Current limit reference voltage setting function By setting a current limit, this IC automatically exercises shorted braking control to ensure that the motor current cannot exceed this limit. (Current limit control time chart) Set current Current mode Coil current Forced CHARGE section fchop Current mode CHARGE SLOW The limit current is set as calculated on the basis of the voltage input to the VREF pin and the resistance between the RF pin and GND using the formula given below. Ilimit = (VREF/5) /RF resistance The voltage applied to the VREF pin can be switched to any of the four setting levels depending on the statuses of the two inputs, ATT1 and ATT2. Function for attenuating VREF input voltage ATT1 ATT2 Current setting reference voltage attenuation ratio Low Low 100% High Low 80% Low High 50% High High 20% The formula used to calculate the output current when using the function for attenuating the VREF input voltage is given below. Ilimit = (VREF/5) × (attenuation ratio) /RF resistance Example : At VREF of 1.5V, a reference voltage setting of 100% [(ATT1, ATT2) = (L, L)] and an RF resistance of 0.3, the output current is set as shown below. Ilimit = 1.5V/5 × 100%/0.3 = 1.0A If, in this state, (ATT1, ATT2) has been set to (H, H), Ilimit will be as follows : Ilimit = 1.0A × 20% = 200mA www.onsemi.com 20 LV8774Q 3-5) Examples of current waveform in each micro-step mode with stepper motor parallel input control Full step (CW mode) DC11 DC12 DC21 DC22 (%) 100 I1 0 -100 (%) 100 I2 0 -100 Half step full torque (CW mode) DC11 DC12 DC21 DC22 (%) 100 l1 0 -100 (%) 100 l2 0 -100 www.onsemi.com 21 LV8774Q 4. 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 stepper motor driver (STM) mode (DM = Low), this function sets the output to the standby mode for both channels by detecting the short-circuiting in one of the channels. In the DC motor driver mode (DM = High), channels 1 and 2 operate independently. (Even if the output of channel 1 has been short-circuited, channel 2 will operate normally.) 4-1) Output short-circuit protection mode switching function Output short-circuit protection mode of IC can be switched by the setting of EMM pin. EMM State Low or Open Latch method High Auto reset method 4-2) 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-circuit protection circuit to be activated. When the short-circuited state continues for the period of time set using the internal timer (approximately 2s), 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. www.onsemi.com 22 LV8774Q 4-3) 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. 4-4) Unusual condition warning output pins (EMO, MONI) The LV8774 is provided with the EMO pin which notifies the CPU if the protection circuit detects 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. In the DC motor driver mode (DM = High), the MONI pin also functions as a warning output pin. The functions of the EMO pin and MONI pin change function as shown below depending on the state of the DM pin. When the DM is low (STM mode) : EMO : Unusual condition warning output pin MONI : Excitation initial position detection monitoring When the DM is high (DCM) mode) : EMO : Channel 1 warning output pin MONI : Channel 2 warning output pin The EMO (MONI) pin is also 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 DM = L (STM mode) DM = H (DCM mode) EMO MONI EMO Channel 1 short-circuit detected ON - ON MONI - Channel 2 short-circuit detected ON - - ON Overheating condition detected ON - ON ON 4-5) 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. Timer latch : Tcem 5. Tcem Ccem Vtcem/Icem [sec] Vtcem : Comparator threshold voltage, typ 1V Icem : CEM pin charge current, typ 10A Thermal shutdown function The thermal shutdown circuit is included, and the output is turned off when junction temperature Tj exceeds 180°C and the abnormal state warning output is turned on at the same time. When the temperature falls below the hysteresis level, output is driven again (automatic restoration) The thermal shutdown circuit doesn’t guarantee protection of the set and the destruction prevention of IC, as it operates at a temperature that is higher than the rating (Tjmax=150°C) of the junction temperature TTSD = 180°C (typ) ΔTSD = 40°C (typ) www.onsemi.com 23 LV8774Q 6. 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. If the VG pin voltage is not boosted to VM+4V or more, the output pin cannot be turned on. Therefore it is recommended that the drive of motor is started after the time has passed tONG or more. ST VG pin voltage VM+VREG5 VM+4V VM tONG VG Pin Voltage Schematic View www.onsemi.com 24 LV8774Q Application Circuit Example Short-circuit state detection monitor Logic input Clock input Position detection monitor Stepper motor driver circuit (DM = Low) 200pF 100pF 47kΩ 1.5V 28 27 26 FR/DC21 RST/BLK MONI CHOP EMM 25 24 23 ATT1 29 CEM 30 EMO 31 STEP/DC22 32 MD2/DC12 34 NC 33 MD1/DC11 47kΩ ATT2 22 35 DM VREG5 21 36 OE CP1 20 37 ST CP2 19 VM 18 38 VREF LV8774 39 GND 0.1uF 0.1uF 0.1uF VG 17 40 OUT2B OUT1A 16 41 OUT2B OUT1A 15 42 PGND PGND 14 RF2 NC OUT2A OUT2A OUT1B OUT1B RF1 RF1 NC VM1 12 RF2 VM1 13 44 VM2 NC 43 VM2 1 2 3 4 5 6 7 8 9 10 11 0.22Ω 24V 10uF 0.22Ω M The formulae for setting the constants in the example of the application circuit above are as follows : Constant current (100%) setting When VREF = 1.5V IOUT = VREF/5/RF resistance = 1.5V/5/0.22 = 1.36A Chopping frequency setting Fchop = Ichop/ (Cchop × Vtchop × 2) = 10A/ (200pF × 0.5V × 2) = 50kHz Timer latch time when the output is short-circuited Tcem = Ccem × Vtcem/Icem = 100pF × 1V/10A = 10s www.onsemi.com 25 LV8774Q Channel 1 short-circuit state detection monitor Logic input Channel 2 short-circuit state detection monitor DC motor driver circuit (DM = High, and the current limit function is in use.) 200pF 100pF 47kΩ 28 27 26 FR/DC21 STEP/DC22 RST/BLK MONI CHOP EMM 25 24 23 ATT1 29 CEM 30 EMO 31 ATT2 22 35 DM VREG5 21 36 OE CP1 20 37 ST CP2 19 38 VREF VM 18 39 GND VG 17 40 OUT2B OUT1A 16 41 OUT2B OUT1A 15 42 PGND PGND 14 OUT2A OUT2A OUT1B OUT1B RF1 RF1 NC VM1 12 NC 44 VM2 RF2 VM1 13 RF2 43 VM2 NC 1.5V 32 MD2/DC12 34 NC 33 MD1/DC11 47kΩ 1 2 3 4 5 6 7 8 9 10 11 0.22Ω 0.1uF 0.1uF 0.1uF 0.22Ω M M The formulae for setting the constants in the example of the application circuit above are as follows : Constant current limit (100%) setting When VREF = 1.5V Ilimit = VREF/5/RF resistance = 1.5V/5/0.22 = 1.36A Chopping frequency setting Fchop = Ichop/ (Cchop × Vtchop × 2) = 10A/ (200pF × 0.5V × 2) = 50kHz Timer latch time when the output is short-circuited Tcem = Ccem × Vtcem/Icem = 100pF × 1V/10A = 10s www.onsemi.com 26 24V 10uF LV8774Q EMM CEM EMO ATT1 OUT1B RF1 RF1 NC Short-circuit state detection monitor CHOP OUT1B MONI NC OUT2A FR/DC21 STEP/DC22 RF2 RST/BLK MD2/DC12 RF2 OUT2A MD1/DC11 NC Logic input Short-circuit state detection monitor High current DC motor driver circuit (DM = High, and the current limit function cannot be used.) LV8774Q can drive a large current DC motor by connecting two H-bridges to parallel. Iomax = 4A Iopeak = 5A (tw 10ms, duty 20%) When it connects two H-bridges to parallel, LV8774Q cannot use the internal PWM constant current control function. Please connect the RF1 pin and RF2 pin to GND. www.onsemi.com 27 LV8774Q ORDERING INFORMATION Device LV8774Q-AH Package VQFN44L (6mm 6mm) (Pb-Free / Halogen Free) Shipping (Qty / Packing) 1000 / Tape & Reel † For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. http://www.onsemi.com/pub_link/Collateral/BRD8011-D.PDF ON Semiconductor and the ON logo are registered trademarks of Semiconductor Components Industries, LLC (SCILLC) or its subsidiaries in the United States and/or other countries. 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. 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