Ordering number : ENA1961 Bi-CMOS LSI LV8773 PWM Constant-Current Control Stepping Motor Driver 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 stepping motors used in office equipment and amusement applications. Features • 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 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. 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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. 62211 SY 20110609-S00001 No.A1961-1/26 LV8773 Allowable Operating Ratings at Ta = 25°C Parameter Symbol Conditions Ratings Unit Supply voltage range VM 9 to 32 V Logic input voltage VIN 0 to 5.5 V VREF input voltage range VREF 0 to 3 V Electrical Characteristics at Ta = 25°C, VM = 24V, VREF = 1.5V Ratings Parameter Symbol Conditions Unit min Standby mode current drain IMst typ ST = “L” 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 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 °C 40 Motor driver Output on resistance 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 Rise time tONG 28 Oscillator frequency Fosc VG = 0.1μF 28.7 29.8 90 125 7 10 0.8 1 V μS 200 150 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 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 1 unit 3.2 3.0 2.0 1.5 0 —20 0 20 40 60 80 100 Ambient temperature, Ta - C No.A1961-2/26 LV8773 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 CP2 1 28 VM CP1 2 27 VG VREG5 3 26 OUT1A ATT 4 25 PGND EMO1 5 24 VM1 CEM 6 23 RF1 EMM 7 22 OUT1B LV8773 CHOP 8 21 OUT2A EMO2 9 20 RF2 VM2 DC22 10 19 DC21 11 18 PGND DC12 12 17 OUT2B DC11 13 16 GND 15 VREF ST 14 Top view No.A1961-3/26 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 Block Diagram No.A1961-4/26 LV8773 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. No.A1961-5/26 LV8773 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 VREG5 state detection time setting capacitor GND 8 CHOP Copping frequency setting capacitor connection pin. VREG5 GND No.A1961-6/26 LV8773 Description of operation (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 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 (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) = 45.4kHz No.A1961-7/26 LV8773 (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. 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 No.A1961-8/26 LV8773 (6) Typical current waveform in each excitation mode when stepping motor parallel input control 2-phase excitation (CW mode) DC11 DC12 DC21 DC22 (%) 100 0 I1 -100 (%) 100 0 I2 -100 1-2 phase excitation full torque (CW mode) DC11 DC21 DC12 DC22 (%) 100 l1 0 -100 (%) 100 l2 0 -100 No.A1961-9/26 LV8773 (7) 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.) (7-1) Output short-circuit 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 (7-2) 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 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 H-bridge output state Output ON Output OFF Standby state Threshold voltage CEM voltage Short-circuit detection state Short- Release circuit Short-circuit Internal counter 1st counter start 1st counter 1st counter stop start 1st counter end 2nd counter start 2nd counter end No.A1961-10/26 LV8773 (7-3) 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 overcurrent mode still continues, the switching mode described above is repeated until the overcurrent mode is canceled. (7-4) 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 EMO1 EMO2 Channel 1 short-circuit detected ON - Channel 2 short-circuit detected - ON Overheating condition detected ON ON (7-5) 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 Tcem ≈ Ccem × Vtcem/Icem [sec] Vtcem : Comparator threshold voltage, typ 1V Icem : CEM pin charge current, typ 10μA (8) 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 No.A1961-11/26 LV8773 Application Circuit Example • Stepping motor driver circuit 24V + 1 CP2 VM 28 2 CP1 VG 27 3 VREG5 4 ATT 5 EMO1 VM1 24 6 CEM RF1 23 7 EMM 8 CHOP PGND 25 LV8773 100pF OUT1A 26 OUT1B 22 OUT2A 21 200pF M 9 Position detection monitor Logic input EMO2 RF2 20 10 DC22 VM2 19 11 DC21 PGND 18 12 DC12 OUT2B 17 13 DC11 GND 16 14 ST VREF 15 + 1.5V 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) = 45.4kHz Timer latch time when the output is short-circuited Tcem = Ccem × Vtcem/Icem = 100pF × 1V/10μA = 10μs No.A1961-12/26 LV8773 • DC motor driver circuit (Constant current control function is used.) 24V + - Channel 1 short-circuit state detection monitor 1 CP2 VM 28 2 CP1 VG 27 3 VREG5 4 ATT 5 EMO1 VM1 24 6 CEM RF1 23 7 EMM 8 CHOP 9 EMO2 PGND 25 LV8773 100pF OUT1A 26 M OUT1B 22 OUT2A 21 200pF Channel 2 short-circuit state detection monitor Logic input RF2 20 10 DC22 VM2 19 11 DC21 PGND 18 12 DC12 OUT2B 17 13 DC11 GND 16 14 ST VREF 15 M + 1.5V 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) = 45.4kHz Timer latch time when the output is short-circuited Tcem = Ccem × Vtcem/Icem = 100pF × 1V/10μA = 10μs No.A1961-13/26 LV8773 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 June, 2011. Specifications and information herein are subject to change without notice. PS No.A1961-14/14