LV8772

Ordering number : ENA1975 LV8772 Overview Bi-CMOS LSI PWM Constant-Current Control Stepping Motor Driver The LV8772 is a stepping motor driver, which is capable of micro-step drive and supports 4W 1-2 phase excitation. It is stepping motors used in office equipment and amusement applications. Features • Low on resistance (upper side : 0.3Ω ; lower side : 0.25Ω ; total of upper and lower : 0.55Ω ; Ta = 25°C, IO = 2.5A) • Excitation mode can be set to 2-phase, 1-2 phase, W1-2 phase , or 4W1-2 phase • BiCDMOS process IC • Excitation step proceeds only by step signal input • Output short-circuit protection circuit incorporated • Motor current selectable in four steps • Unusual condition warning output pins • No control power supply required Specifications Absolute Maximum Ratings at Ta = 25°C Parameter Supply voltage Output peak current Output current Logic input voltage MONI/EMO input voltage Allowable power dissipation Symbol VM max IO peak IO max VIN Vmoni/Vemo Pd max1 Pd max2 Operating temperature Storage temperature Topr Tstg 1 unit * tw ≤ 10ms, duty 20% Conditions Ratings 36 3.0 2.5 -0.3 to +6 -0.3 to +6 3.0 5.4 -20 to +85 -55 to +150 Unit V A A V V W W °C °C * Specified circuit board : 90.0mm×90.0mm×1.6mm, glass epoxy 2-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. Any and all SANYO Semiconductor Co.,Ltd. products described or contained herein are, with regard to "standard application", intended for the use as general electronics equipment. The products mentioned herein shall not be intended for use for any "special application" (medical equipment whose purpose is to sustain life, aerospace instrument, nuclear control device, burning appliances, transportation machine, traffic signal system, safety equipment etc.) that shall require extremely high level of reliability and can directly threaten human lives in case of failure or malfunction of the product or may cause harm to human bodies, nor shall they grant any guarantee thereof. If you should intend to use our products for new introduction or other application different from current conditions on the usage of automotive device, communication device, office equipment, industrial equipment etc. , please consult with us about usage condition (temperature, operation time etc.) prior to the intended use. If there is no consultation or inquiry before the intended use, our customer shall be solely responsible for the use. Specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer's products or equipment. To verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer ' s products or equipment. 90711 SY 20110902-S00001 No.A1975-1/17 LV8772 Allowable Operating Ratings at Ta = 25°C Parameter Supply voltage range Logic input voltage VREF input voltage range Symbol VM VIN VREF Conditions Ratings 9 to 32 0 to 5.5 0 to 3 Unit V V V Electrical Characteristics at Ta = 25°C, VM = 24V, VREF = 1.5V Parameter Standby mode current drain Current drain VREG5 output voltage Thermal shutdown temperature Thermal hysteresis width Motor driver Output on resistance Ronu Rond Output leakage current Diode forward voltage Logic pin input current IOleak VD IINL IINH Logic high-level input voltage Logic low-level input voltage Current setting comparator threshold voltage (current step switching) 4W1-2-phase drive Vtdac1_4W Vtdac2_4W Vtdac3_4W Vtdac4_4W Vtdac5_4W Vtdac6_4W Vtdac7_4W Vtdac8_4W Vtdac9_4W Vtdac10_4W Vtdac11_4W Vtdac12_4W Vtdac13_4W Vtdac14_4W Vtdac15_4W W1-2-phase drive Vtdac4_W Vtdac8_W Vtdac12_W 1-2 phase drive Vtdac0_H Vtdac8_H 2 phase drive Current setting comparator threshold voltage (current attenuation rate switching) Vtdac8_F Vtatt00 Vtatt01 Vtatt10 Vtatt11 Chopping frequency CHOP pin charge/discharge current Fchop Ichop Vtdac0_W VINH VINL Vtdac0_4W Step 0 (When initialized : channel 1 comparator level) Step 1 (Initial state+1) Step 2 (Initial state+2) Step 3 (Initial state+3) Step 4 (Initial state+4) Step 5 (Initial state+5) Step 6 (Initial state+6) Step 7 (Initial state+7) Step 8 (Initial state+8) Step 9 (Initial state+9) Step 10 (Initial state+10) Step 11 (Initial state+11) Step 12 (Initial state+12) Step 13 (Initial state+13) Step 14 (Initial state+14) Step 15 (Initial state+15) Step 0 (When initialized : channel 1 comparator level) Step 4 (Initial state+1) Step 8 (Initial state+2) Step 12 (Initial state+3) Step 0 (When initialized : channel 1 comparator level) Step 8 (Initial state+1) Step 8' (When initialized : channel 1 comparator level) ATT1 = L, ATT2 = L ATT1 = H, ATT2 = L ATT1 = L, ATT2 = H ATT1 = H, ATT2 = H Cchop = 180pF 0.291 0.232 0.143 0.053 45 7 0.3 0.24 0.15 0.06 55 10 0.309 0.248 0.157 0.067 65 13 V V V V kHz μA 0.201 0.291 0.21 0.3 0.219 0.309 V V 0.267 0.201 0.107 0.291 0.276 0.21 0.114 0.3 0.285 0.219 0.121 0.309 V V V V 0.291 0.285 0.279 0.267 0.255 0.240 0.222 0.201 0.180 0.157 0.134 0.107 0.080 0.053 0.023 0.291 0.3 0.294 0.288 0.276 0.264 0.249 0.231 0.210 0.189 0.165 0.141 0.114 0.087 0.060 0.030 0.3 0.309 0.303 0.297 0.285 0.273 0.258 0.240 0.219 0.198 0.173 0.148 0.121 0.094 0.067 0.037 0.309 V V V V V V V V V V V V V V V V 0.291 0.3 ID = -2.5A VIN = 0.8V VIN = 5V 4 30 2.0 0.8 0.309 1.2 8 50 IO = 2.5A, Upper-side on resistance IO = 2.5A, Lower-side on resistance 0.3 0.25 0.4 0.33 50 1.4 12 70 Ω Ω μA V μA μA V V V Symbol IMst IM Vreg5 TSD ΔTSD ST = “L” ST = “H”, with no load IO = -1mA Design guarantee Design guarantee 4.5 150 Conditions Ratings min typ 100 3.2 5 180 40 max 400 5 5.5 200 Unit μA mA V °C °C Continued on next page. No.A1975-2/17 LV8772 Continued from preceding page. Parameter Chopping oscillation circuit threshold voltage VREF pin input current MONI pin saturation voltage Charge pump VG output voltage Rise time Oscillator frequency Output short-circuit protection EMO pin saturation voltage Vsatemo Iemo = 1mA 400 mV VG tONG Fosc VG = 0.1μF, CP1-CP2 = 0.1μF, ST = “H” →VG = VM+4V 90 125 150 kHz 28 28.7 200 29.8 500 V μS Symbol Vtup Vtdown Iref Vsatmon VREF = 1.5V Imoni = 1mA Conditions Ratings min 0.8 0.4 -0.5 400 typ 1 0.5 max 1.2 0.6 Unit V V μA mV Package Dimensions unit : mm (typ) 3147C 28 15 R1.7 12.7 11.2 8.4 1 20.0 26.75 14 (1.81) 1.78 0.6 1.0 SANYO : DIP28H(500mil) 7.0 Pd max - Ta Allowable power dissipation, Pd max - W 6.0 5.4 5.0 With substrate 2.20 3.0 1 unit 2.8 2.0 1.5 1.0 0 —0 2 0 20 40 60 4.0 4.0 80 100 Ambient temperature, Ta - C 0.4 No.A1975-3/17 Block Diagram CP2 Charge pump CP1 VG RF1 OUT A OUT B VM VM2 OUT2A OUT2B RF2 VM + PGND MONI Output preamplifier stage Output preamplifier stage Output preamplifier stage Output preamplifier stage LV8772 EMO VREG5 Regulator + VREF + Oscillation circuit TSD LVS CHOP ST ATT1 ATT2 Attenuator (4 levels selectable) Current selection (4W1-2/ W1-2/1-2/2) Output control logic + Current selection (4W1-2/ W1-2/1-2/2) SGND MD1 MD2 FR STEP RST No.A1975-4/17 LV8772 Pin Assignment VM VG OUT1A PGND VM1 RF1 OUT1B OUT2A RF2 VM2 PGND OUT2B GND VREF 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Top view 28 27 26 25 24 23 22 CP2 CP1 VREG5 ATT2 ATT1 EMO CHOP MONI LV8772 21 20 RST 19 STEP 18 FR 17 MD2 16 MD1 15 ST Pin Functions Pin No. 25 24 20 19 18 17 16 Pin Name ATT2 ATT1 RST STEP FR MD2 MD1 Pin Functtion Motor holding current switching pin. Motor holding current switching pin. RESET input pin STEP signal input pin CW / CCW signal input pin Excitation mode switching pin 2 Excitation mode switching pin 1 Equivalent Circuit VREG5 GND 15 ST Chip enable pin. VREG5 GND Continued on next page. No.A1975-5/17 LV8772 Continued from preceding page. Pin No. 12 4/11 10 9 8 7 6 5 3 Pin Name OUT2B PGND VM2 RF2 OUT2A OUT1B RF1 VM1 OUT1A Pin Functtion Channel 2 OUTB output pin. Power system ground. Channel 2 motor power supply connection pin. Channel 2 current-sense resistor connection pin. Channel 2 OUTA output pin. Channel 1 OUTB output pin. Channel 1 current-sense resistor connection pin. Channel 1 motor power supply pin. Channel 1 OUTA output pin Equivalent Circuit 5 10 38 7 12 4 11 6 9 GND 2 1 28 27 VG VM CP2 CP1 Charge pump capacitor connection pin. Motor power supply connection pin. Charge pump capacitor connection pin. Charge pump capacitor connection pin 27 VREG5 1 28 2 GND 14 VREF Constant current control reference voltage input pin VREG5 GND 26 VREG5 Internal power supply capacitor connection pin VM GND Continued on next page. No.A1975-6/17 LV8772 Continued from preceding page. Pin No. 23 21 Pin Name EMO MONI pin. Position detection monitor pin. Pin Functtion Output short-circuit state warning output Equivalent Circuit VREG5 GND 22 CHOP Chopping frequency setting capacitor connection pin VREG5 GND No.A1975-7/17 LV8772 Description of operation Input Pin Function (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 Low or Open High Mode Standby mode Operating mode Internal regulator Standby Operating Charge pump Standby Operating Stepping mode drive method (1) STEP pin function Input ST Low High High STP * Standby mode Excitation step proceeds Excitation step is kept Operating mode (2) Excitation mode setting function MD1 MD2 Excitation mode Channel 1 Low High Low High Low Low High High 2 phase excitation 1-2 phase excitation W1-2 phase excitation 4W1-2 phase excitation 100% 100% 100% 100% Initial position Channel 2 -100% 0% 0% 0% This is the initial position of each excitation mode in the initial state after power-on and when the counter is reset. (3) Position detection monitoring function The MONI position detection monitoring pin is of an open drian type. When the excitation position is in the initial position, the MONI output is placed in the ON state. (Refer to "Examples of current waveforms in each of the excitation modes.") (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 Low High Low High ATT2 Low Low High High Current setting reference voltage attenuation ratio 100% 80% 50% 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 No.A1975-8/17 LV8772 Example : At VREF of 1.5V, a reference voltage setting of 100% [(ATT1, ATT2) = (L, L)] and an RF resistance of 0.22Ω, the output current is set as shown below. IOUT = 1.5V/5 × 100%/0.22Ω = 1.36A If, in this state, (ATT1, ATT2) is set to (H, H), IOUT will be as follows : IOUT = 1.36A × 20% = 272mA In this way, the output current is attenuated when the motor holding current is supplied so that power can be conserved. (5) 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 1μs. (6) Reset function RST Low High Operating mode Normal operation Reset state RST STEP MONI RESET 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. No.A1975-9/17 LV8772 (7) Forward/reverse switching function FR Low High Operating mode Clockwise (CW) 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. (8) 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 180pF, the chopping frequency will be as follows : Fchop = 10μA/ (180pF × 0.5V × 2) = 55kHz No.A1975-10/17 LV8772 (9) Output current vector locus (one step is normalized to 90 degrees) 100.0 Channeel 1 Phase vurrent ratio(%) 66.7 33.3 0.0 0.0 33.3 66.7 100.0 Channeel 2 Phase vurrent ratio(%) Setting current ration in each excitation mode STEP 4W1-2 phase (%) Channel 1 θ0 θ1 θ2 θ3 θ4 θ5 θ6 θ7 θ8 θ9 θ10 θ11 θ12 θ13 θ14 θ15 θ16 100 100 98 96 92 88 83 77 70 63 55 47 38 29 20 10 0 Channel 2 0 10 20 29 38 47 55 63 70 77 83 88 92 96 98 100 100 0 100 0 100 38 92 70 70 70 70 100 100 92 38 W1-2 phase (%) Channel 1 100 Channel 2 0 1-2 phase (%) Channel 1 100 Channel 2 0 2-phase (%) Channel 1 Channel 2 No.A1975-11/17 LV8772 (10) Typical current waveform in each excitation mode 2-phase excitation (CW mode) STEP MONI (%) 100 l1 0 -100 (%) 100 I2 0 -100 1-2 phase excitation (CW mode) STEP MONI (%) 100 I1 0 -100 (%) 100 I2 0 -100 No.A1975-12/17 LV8772 W1-2 phase excitation (CW mode) STEP MONI (%) 100 I1 0 -100 (%) 100 I2 0 -100 4W1-2 phase excitation (CW mode) STEP MONI [%] 100 50 I1 0 -50 -100 [%] 100 50 I2 0 -50 -100 No.A1975-13/17 LV8772 (11) 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 FAST Forced CHARGE section FAST CHARGE SLOW In each current mode, the operation sequence is as described below : • At rise of chopping frequency, the CHARGE mode begins. (In the time defined as the “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) state exists ; The CHARGE mode up to ICOIL ≥ IREF, then followed by changeover to the SLOW DECAY mode, and finally by the FAST DECAY mode for approximately 1μs. When (ICOIL < IREF) state does not exist ; The FAST DECAY mode begins. The coil current is attenuated in the FAST DECAY mode till one cycle of chopping is over. 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 and followed by the SLOW DECAY mode. No.A1975-14/17 LV8772 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. This function sets the output to the standby mode for both channels by detecting the short-circuiting in one of the channels. (1) Output short-circuit protection method The output short-circuit protection method of LV8772 is a latch method to turn off the output when the output current exceeds the detection current, and to maintain the state. The detection of the output short-circuited state by the IC causes the output short-circuit protection circuit to be activated. All the outputs of correspondence ch side where the short-circuit was first detected are switched to the standby mode when the short-circuit is the consecutive between internal timers (approximately 4μs), and the state is maintained. This state is released by setting ST to low. H-bridge output state Output ON Standby state Short-circuit detection state Short- Release circuit Short-circuit Internal counter 1st counter start 1st counter 1st counter stop start 1st counter end (2) Unusual condition warning output pins (EMO) The LV8772 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. Furthermore, the EMO 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. No.A1975-15/17 LV8772 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 sufficiently, the output cannot be controlled, so be sure to provide a wait time of tONG or more after setting the ST pin High before starting to drive the motor. ST VG pin voltage VM+VREG5 VM+4V VM tONG VG Pin Voltage Schematic View No.A1975-16/17 LV8772 • Stepping motor driver circuit 24V -+ 1 VM 2 3 4 5 6 VG OUT1A PGND VM1 RF1 CP2 28 CP1 27 VREG5 26 ATT2 25 ATT1 24 EMO 23 Short-circuit state detection monitor 180pF Application Circuit Example LV8772 7 OUT1B 8 M 9 OUT2A RF2 CHOP 22 MONI 21 RST 20 STEP 19 FR 18 MD2 17 MD1 16 ST 15 Logic input Clock input Position detection monitor 10 VM2 11 PGND 12 OUT2B 13 GND -+ 1.5V 14 VREF 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/5/0.22Ω = 1.36A Chopping frequency setting Fchop = Ichop/ (Cchop × Vtchop × 2) = 10μA/ (180pF × 0.5V × 2) = 55kHz SANYO Semiconductor Co.,Ltd. assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein. 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SANYO Semiconductor Co.,Ltd. shall not be liable for any claim or suits with regard to a third party's intellctual property rights which has resulted from the use of the technical information and products mentioned above. This catalog provides information as of September, 2011. Specifications and information herein are subject to change without notice. PS No.A1975-17/17