LV8740V

Ordering number : ENA1864 Bi-CMOS LSI LV8740V Overview PWM Current Control Stepping Motor Driver The LV8740V is a 2-channel H-bridge driver IC that can switch a stepping motor driver, which is capable of micro-step drive and supports W 1-2 phase excitation, and two channels of a brushed motor driver, 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 • Single-channel PWM current control stepping motor driver (selectable with DC motor driver channel 2) incorporated. • On resistance (upper side : 0.3Ω ; lower side : 0.2Ω ; total of upper and lower : 0.5Ω ; Ta = 25°C, IO = 2.5A) • Excitation mode can be set to 2-phase, 1-2 phase full torque, 1-2 phase or W1-2 phase • Excitation step proceeds only by step signal input • Motor holding current selectable in four steps • BiCDMOS process IC • Output short-circuit protection circuit (selectable from latch-type or auto reset-type) incorporated • Unusual condition warning output pins • Supports control power supply Specifications Absolute Maximum Ratings at Ta = 25°C Parameter Supply voltage 1 Output peak current Output current Logic input voltage MONI/EMO input voltage Allowable power dissipation Operating temperature Storage temperature Symbol VM max IO peak IO max VIN VMONI/VEMO Pd max Topr Tstg * tw ≤ 10ms, duty 20%, Each 1ch Each 1ch Conditions Ratings 38 3.0 2.5 -0.3 to +6.0 -0.3 to +6.0 3.45 -30 to +85 -55 to +150 Unit V A A V V W °C °C * Specified circuit board : 90×90×1.6mm3 : 2-Layer glass epoxy printed circuit board with back mounting. 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 (home appliances, AV equipment, communication device, office equipment, industrial equipment etc.). 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. 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N1010 SY 20101015-S00001 No.A1864-1/23 LV8740V Recommended Operating Conditions at Ta = 25°C Parameter Supply voltage range Logic input voltage VREF input voltage range Symbol VM VIN VREF Conditions Ratings 9 to 35 0 to 5.5 0 to 3.0 Unit V V V Electrical Characteristics at Ta = 25°C, VM = 24V, VREF = 1.5V Parameter Standby mode current drain 1 Current drain VREG5 output voltage Thermal shutdown temperature Thermal hysteresis width Motor Driver Output on-resistance Ronu Rond Output leakage current Diode forward voltage ST pin input current IOleak VD ISTL ISTH Logic pin input current (other ST pin) Logic high-level input voltage Logic low-level input voltage Current selection comparator threshold voltage (Current step switch) 1-2 phase drive W1-2-phase drive Vtdac1_W Vtdac2_W Vtdac3_W Vtdac0_H Vtdac2_H 1-2 phase (full torque) drive Vtdac2_HF 2 phase drive Current selection comparator threshold voltage (Current attenuation rate switch) Vtdac2_F Vtatt00 Vtatt01 Vtatt10 Vtatt11 Chopping frequency 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 CEM pin charge current CEM pin threshold voltage Vsatemo Icem Vtcem Iemo = 1mA Vcem=0V 7 0.8 50 10 1.0 100 13 1.2 mV μA V VG tONG Fosc VG = 0.1μF RCHOP = 20kΩ 90 125 28 28.7 29.8 0.5 150 V ms kHz Fchop Iref Vsatmon Vtdac0_HF IINL IINH VINH VINL Vtdac0_W Step 0(When initialized : channel 1 comparator level) Step 1 (Initial state+1) Step 2 (Initial state+2) Step 3 (Initial state+3) Step 0 (When initialized: channel 1 comparator level) Step 2 (Initial state+1) Step 0 (Initial state, channel 1 comparator level) Step 2 (Initial state+1) Step 2 ATT1=L, ATT2=L ATT1=H, ATT2=L ATT1=L, ATT2=H ATT1=H, ATT2=H RCHOP = 20kΩ VREF = 1.5V IMONI=1mA 0.290 0.290 0.290 0.190 0.140 0.090 45 -0.5 50 100 0.300 0.300 0.300 0.200 0.150 0.100 62.5 0.310 0.310 0.310 0.210 0.160 0.110 75 V V V V V V kHz μA mV 0.200 0.290 0.210 0.300 0.220 0.310 V V 0.260 0.200 0.095 0.290 0.270 0.210 0.105 0.300 0.280 0.220 0.115 0.310 V V V V 0.290 0.300 ID = -2.5A VIN = 0.8V VIN = 5V VIN = 0.8V VIN = 5V 3 48 3 30 2.0 0.8 0.310 1.1 8 80 8 50 IO = 2.5A, Upper-side on resistance IO = 2.5A, Lower-side on resistance 0.3 0.2 0.4 0.25 50 1.3 15 112 15 70 Ω Ω μA V μA μA μA μA V V V Symbol IMstn IM Vreg5 TSD ΔTSD ST = ”L” ST = ”H”, OE = ”L”, no load IO=-1mA Design guarantee Design guarantee 4.7 150 Conditions min Ratings typ 180 3 5.0 180 40 max 250 5 5.3 210 μA mA V °C °C Unit No.A1864-2/23 LV8740V Package Dimensions unit : mm (typ) 3285A TOP VIEW 15.0 44 SIDE VIEW BOTTOM VIEW (7.8) 5.6 7.6 1 (0.68) 2 0.65 0.22 0.2 SIDE VIEW 0.1 (1.5) 1.7 MAX 0.5 SANYO : SSOP44J(275mil) Pin Assignment VG 1 VM 2 CP2 3 CP1 4 VREG5 5 ATT2 6 ATT1 7 EMO 8 CEM 9 EMM 10 RCHOP 11 44 OUT1A 43 OUT1A 42 PGND1 41 NC 40 NC 39 VM1 38 VM1 37 RF1 36 RF1 35 OUT1B 34 OUT1B LV8740V MONI 12 RST 13 STP/DC22 14 FR/DC21 15 MD2/DC12 16 MD1/DC11 17 DM 18 OE 19 ST 20 VREF 21 GND 22 Top view 33 OUT2A 32 OUT2A 31 RF2 30 RF2 29 VM2 28 VM2 27 NC 26 NC 25 PGND2 24 OUT2B 23 OUT2B (3.6) No.A1864-3/23 LV8740V Pd max - Ta Four-layer circuit board 1 *1 6.0 Allowable power dissipation, Pd max - W 5.50 5.0 4.0 Four-layer circuit board 2 *2 3.80 3.45 Two-layer circuit board 1 *1 3.0 Two-layer circuit board 2 *2 2.65 2.86 1.98 1.79 1.38 2.0 1.0 *1 With components mounted on the exposed die-pad board *2 With no components mounted on the exposed die-pad board 0 —0 2 0 20 40 60 80 100 Ambient temperature, Ta - C Substrate Specifications (Substrate recommended for operation of LV8740V) Size : 90mm × 90mm × 1.6mm Material : Glass epoxy Copper wiring density : L1 = 85% / L2 = 90% L1 : Copper wiring pattern diagram L2 : Copper wiring pattern diagram Cautions 1) The data for the case with the Exposed Die-Pad substrate 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. No.A1864-4/23 Block Diagram CP2 OUT1A VM2 OUT2A OUT2B RF2 CP1 VG RF1 OUT1B VM1 VM Charge pump + - PGND Output preamplifier stage Output preamplifier stage MONI Output control logic Regulator + Attenuator (4 levels selectable) Oscillation circuit TSD LVS RCHOP ST ATT1 ATT2 MD1/ DC11 MD2/ FR/ STP/ RST OE DC12 DC21 DC22 DM EMM Current selection (W1-2/1-2/ 1-2Full/2) + Current selection (W1-2/1-2/ 1-2Full/2) Output preamplifier stage Output preamplifier stage EMO LV8740V VREG5 CEM VREF + - SGND No.A1864-5/23 LV8740V Pin Functions Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23, 24 25 28, 29 30, 31 32, 33 34, 35 36, 37 38, 39 42 43, 44 26, 27 40, 41 Pin name VG VM CP2 CP1 VREG5 ATT2 ATT1 EMO CEM EMM RCHOP MONI RST STP/DC22 FR/DC21 MD2/DC12 MD1/DC11 DM OE ST VREF SGND OUT2B PGND2 VM2 RF2 OUT2A OUT1B RF1 VM1 PGND1 OUT1A NC Charge pump capacitor connection pin Motor power supply connection pin Charge pump capacitor connection pin Charge pump capacitor connection pin Internal power supply capacitor connection pin Motor holding current switching pin Motor holding current switching pin Output short-circuit state warning output pin Pin to connect the output short-circuit state detection time setting capacitor Overcurrent mode switching pin Chopping frequency setting resistor connection pin Position detection monitor pin Reset signal input pin STM STEP signal input pin/DCM2 output control input pin STM forward/reverse rotation signal input pin/DCM2 output control input pin STM excitation mode switching pin/DCM1 output control input pin STM excitation mode switching pin/DCM1 output control input pin Drive mode (STM/DCM) switching pin Output enable signal input pin Chip enable pin Constant current control reference voltage input pin Signal system ground Channel 2 OUTB output pin Channel 2 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 Power system ground Channel 1 OUTA output pin No Connection (No internal connection to the IC) Description No.A1864-6/23 LV8740V Equivalent Circuits Pin No. 6 7 10 13 14 15 16 17 18 19 ATT2 ATT1 EMM RST STP/DC22 FR/DC21 MD2/DC12 MD1/DC11 DM OE Pin Equivalent Circuit VREG5 GND 20 ST VREG5 GND 23, 24 25 28, 29 30, 31 32, 33 34, 35 36, 37 38, 39 42 43, 44 OUT2B PGND2 VM2 RF2 OUT2A OUT1B RF1 VM1 PGND1 OUT1A 38 39 28 29 43 44 32 33 34 35 23 24 25 42 36 37 30 31 GND Continued on next page. No.A1864-7/23 LV8740V Continued from preceding page. Pin No. 1 2 3 4 VG VM CP2 CP1 Pin Equivalent Circuit VREG5 4 2 3 1 GND 21 VREF VREG5 GND 5 VREG5 VM GND 8 12 EMO MONI VREG5 GND Continued on next page. No.A1864-8/23 LV8740V Continued from preceding page. Pin No. 9 CEM Pin Equivalent Circuit VREG5 GND 11 RCHOP VREG5 GND No.A1864-9/23 LV8740V 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 (2) Drive mode switching pin function The IC drive mode is switched by setting the DM pin. In STM mode, stepping motor channel 1 can be controlled by the CLK-IN input. In DCM mode, DC motor channel 2 or stepping motor channel 1 can be controlled by parallel input. Stepping motor control using parallel input is 2-phase or 1-2 phase full torque. DM Low or Open High Drive mode STM mode DCM mode Application Stepping motor channel 1 (CLK-IN) DC motor channel 2 or stepping motor channel 1 (parallel) STM mode (DM = Low or Open) (1) STEP pin function The excitation step progresses by inputting the step signal to the STP pin. Input ST Low High High STP * Standby mode Excitation step proceeds Excitation step is kept Operating mode (2) Excitation mode setting function The excitation mode of the stepping motor can be set as follows by setting the MD1 pin and the MD2 pin. MD1 MD2 Excitation mode Channel 1 Low High Low High Low Low High High 2 phase excitation 1-2 phase excitation (full torque) 1-2 phase excitation W1-2 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) Positional detection monitor function Positional detection monitor MONI pin is an open drain output. When the excitation position is an initial position, the MONI output becomes ON. Please refer to (example of current wave type in each excitation mode). (4)Constant-current control reference voltage setting function This IC does the PWM fixed current chopping control of the current of the motor by the automatic operation in setting the output current. The output current in which a fixed current is controlled by the following calculation type is set by the resistance connected between the voltage and RF-GND being input to the VREF pin. IOUT=(VREF/5)/RF resistance *The above-mentioned, set value is an output current of each excitation mode at 100% time. VREF input voltage attenuation function ATT1 Low High Low High ATT2 Low Low High High Current setting reference voltage attenuation ratio 100% 66.7% 50% 33.3% No.A1864-10/23 LV8740V The output ammeter calculation type when the attenuation function of the VREF input voltage is used is as follows. IOUT=(VREF/5)×(Attenuation ratio)/RF resistance (Example) When VREF = 1.5V, setting current ratio = 100% [(ATT1, ATT2) = (Low, Low)] and RF resistor = 0.2Ω, the following output current flows : IOUT = 1.5V/5×100%/0.2Ω=1.5A Under such a condition, when assuming (ATT1, ATT2) = (High, High). IOUT = 1.5A×33.3%=500mA The power saving can be done, and attenuating the output current when the motor energizes maintenance. (5) 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 High, the output excitation position is forced to the initial state, and the MONI output enters ON a state. When RST is set Low after that, the excitation position proceeds to the next STEP input. (6) Output enable function OE High Low Operating mode Output OFF Output ON OE STEP MONI Power save mode 1ch output 0% 2ch output Output is high-impedance No.A1864-11/23 LV8740V When the OE pin is set High, the output is forced OFF and goes to high impedance. However, the internal logic circuits are operating, so the excitation position proceeds when the STEP signal is input to the STP pin. Therefore, when OE is returned to Low, the output level conforms to the excitation position proceeded by the STEP input. (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) Setting the chopping frequency For constant-current control, chopping operation is made with the frequency determined by the external resistor (connected to the RCHOP pin). The chopping frequency to be set with the resistance connected to the RCHOP pin (pin 11) is as shown below. 100 Chopping frequency settings (reference data) 80 Fchop – kHz 60 40 20 0 0 10 20 30 40 50 60 RCHOP – kΩ PCA01883 No.A1864-12/23 LV8740V (9) Output current vector locus (one step is normalized to 90 degrees) 100 80 Channel 1 phase current ratio (%) 60 40 20 0.0 0.0 20 40 60 80 100 Channel 2 current ratio (%) Setting current ration in each excitation mode STEP W1-2 phase (%) Channel 1 θ0 θ1 θ2 θ3 θ4 0 35 70 90 100 Channel 2 100 90 70 35 0 100 0 100 0 70 70 100 100 100 100 1-2 phase (%) Channel 1 0 Channel 2 100 1-2 phase full torque (%) Channel 1 0 Channel 2 100 2-phase (%) Channel 1 Channel 2 No.A1864-13/23 LV8740V (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 full torque (CW mode) STEP MONI (%) 100 I1 0 -100 (%) 100 I2 0 -100 No.A1864-14/23 LV8740V 1-2 phase excitation (CW mode) STEP MONI (%) 100 I1 0 -100 (%) 100 I2 0 -100 W1-2 phase excitation (CW mode) STEP MONI (%) 100 I1 0 -100 (%) 100 I2 0 -100 No.A1864-15/23 LV8740V (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.(The section in which the CHARGE mode is forced regardless of the magnitude of the coil current (ICOIL) and set current (IREF) exists for 1/16 of one chopping cycle.) • The coil current (ICOIL) and set current (IREF) are compared in this forced CHARGE section. When (ICOIL