LV8773

Ordering number : ENA1961 LV8773 Overview Bi-CMOS LSI PWM Constant-Current Control Stepping Motor Driver 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 Supply voltage Output peak current Output current Logic input voltage EMO1/EMO2 input voltage Allowable power dissipation Symbol VM max IO peak IO max VIN Vemo/Vemo2 Pd max1 Pd max2 Operating temperature Storage temperature Topr Tstg 1 unit * tw ≤ 10ms, duty 20% Conditions Ratings 36 2.5 2 -0.3 to +6 -0.3 to +6 3.0 6.2 -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. 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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 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 Ratings 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 attenuation rate switching) Chopping frequency CHOP pin charge/discharge current Chopping oscillation circuit threshold voltage VREF pin input current Charge pump VG output voltage Rise time Oscillator frequency Output short-circuit protection EMO1/EMO2 pin saturation voltage CEM pin charge current CEM pin threshold voltage Vsatemo Icem Vtcem Iemo = 1mA Vcem = 0V 7 0.8 10 1 400 13 1.2 mV μA V VG tONG Fosc VG = 0.1μF 90 28 28.7 200 125 150 29.8 V μS kHz Fchop Ichop Vtup Vtdown Iref VREF = 1.5V Cchop = 220pF 36.3 7 0.8 0.4 -0.5 45.4 10 1 0.5 54.5 13 1.2 0.6 kHz μA V V μA VINH VINL Vtatt0 Vtatt1 ATT = L ATT = H 0.291 0.143 0.3 0.15 ID = -2A VIN = 0.8V VIN = 5V 4 30 2.0 0.8 0.309 0.157 1.2 8 50 IO = 2A, Upper-side on resistance IO = 2A, 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 V Symbol IMst IM Vreg5 TSD ΔTSD ST = “L” ST = “H”, OE = “L”, with no load IO = -1mA Design guarantee Design guarantee 4.5 150 Conditions min typ 100 3.2 5 180 40 max 400 5 5.5 200 μA mA V °C °C Unit 8.0 Pd max - Ta Specified bord:90.0mm × 90.0mm × 1.6mm3 2 Layer glass epoxy with substrate Allowable power dissipation, Pd max - W 6.2 6.0 4.0 1 unit 3.0 2.0 3.2 1.5 0 —0 2 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) (R1.7) 28 15 (8.4) 1.0 (1.81) 3.6 (4.0) 1.78 0.6 SANYO : DIP28HC(500mil) Pin Assignment CP2 1 CP1 2 VREG5 3 ATT 4 EMO1 5 CEM 6 EMM 7 0.4 1 14 11.2 12.7 28 27 26 25 24 23 VM VG OUT1A PGND VM1 RF1 22 OUT1B LV8773 CHOP 8 EMO2 9 DC22 10 DC21 11 DC12 12 DC11 13 ST 14 Top view 21 OUT2A 20 RF2 19 VM2 18 PGND 17 OUT2B 16 GND 15 VREF No.A1961-3/26 Block Diagram CP1 OUT1A VM2 OUT2A OUT2B RF2 CP2 VG RF1 OUT1B VMI VM Charge pump 24V + - Output preamplifier stage Output preamplifier stage Output preamplifier stage LV8773 VREG5 Regulator + + Oscillation circuit Output control logic + EMO1 TSD 5V VREF + 1.5V - Output preamplifier stage PGND GND Overcurrent protection circuit EMO2 CHOP ST ATT DC11 DC12 DC21 DC22 EMM CEM No.A1961-4/26 LV8773 Pin Functions Pin No. 4 7 10 11 12 13 Pin Name ATT2 EMM DC22 DC21 DC12 DC11 Pin Function Motor holding current switching pin. Output short-circuit protection mode switching pin. Channel 2 output control input pin 2 Channel 2 output control input pin 1 Channel 1 output control input pin 2 Channel 1 output control input pin 1 Equivalent Circuit VREG5 10kΩ 100kΩ GND 14 ST Chip enable pin. VREG5 20kΩ 10kΩ 80kΩ GND 17 18, 25 19 20 21 22 23 24 26 OUT2B PGND VM2 RF2 OUT2A OUT1B RF1 VM1 OUT1A 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. 19 24 21 26 17 22 25 18 20 23 GND 27 28 1 2 VG VM CP2 CP1 Charge pump capacitor connection pin. Motor power supply connection pin. Charge pump capacitor connection pin. Charge pump capacitor connection pin. 2 VREG5 28 1 27 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 9 EMO1 EMO2 Channel 1 output short-circuit state warning output pin. Channel 2 output short-circuit state warning output pin. VREG5 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 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 Low or Open High Mode Standby mode Operating mode Internal regulator Standby Operating Charge pump Standby Operating (2) Output control logic input DC11(21) L H L H DC12(22) L L H H OUT1(2)A OFF H L L output OUT1(2)B OFF L H L mode Stand-by CW ( Forward ) CCW ( reverse ) brake (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 Coil current BLANKING time 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 Low High Current setting reference voltage attenuation ratio 100% 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 I1 0 -100 (%) 100 I2 0 -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 Low or Open High State Latch method 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 Channel 1 short-circuit detected Channel 2 short-circuit detected Overheating condition detected EMO1 ON ON EMO2 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 • Stepping motor driver circuit Application Circuit Example 24V +1 2 3 4 5 6 100pF 7 8 200pF 9 Position detection monitor EMO2 RF2 20 VM2 19 PGND 18 OUT2B 17 GND 16 VREF 15 +1.5V EMM CHOP CP2 CP1 VREG5 ATT EMO1 CEM VM 28 VG 27 OUT1A 26 PGND 25 VM1 24 RF1 23 OUT1B 22 OUT2A 21 M LV8773 10 DC22 11 DC21 Logic input 12 DC12 13 DC11 14 ST 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 +1 2 3 4 5 6 100pF 7 8 200pF 9 Channel 2 short-circuit state detection monitor EMO2 RF2 20 VM2 19 PGND 18 OUT2B 17 GND 16 VREF 15 +1.5V M EMM CHOP CP2 CP1 VREG5 ATT EMO1 CEM VM 28 VG 27 OUT1A 26 PGND 25 VM1 24 RF1 23 OUT1B 22 OUT2A 21 M Channel 1 short-circuit state detection monitor LV8773 10 DC22 11 DC21 Logic input 12 DC12 13 DC11 14 ST 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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