LV8741V

Ordering number : ENA0814A Bi-CMOS LSI LV8741V Overview PWM Constant-Current Control Stepping Motor Driver The LV8741V is a PWM current-control stepping motor driver IC. Features • Single-channel PWM current control stepping motor driver (selectable with DC motor driver channel 2) incorporated. • BiCDMOS process IC • On resistance (upper side : 0.5Ω ; lower side : 0.5Ω ; total of upper and lower : 1.0Ω ; Ta = 25°C, IO = 1.5A) • 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 • IO max = 1.5A • Output-stage push-pull structure enabling high-speed operation • Output short-circuit protection circuit (selectable from latch-type or auto reset-type) incorporated • Thermal shutdown circuit and power supply monitor circuit incorporated • Supports control power supply VCC = 3.3V Specifications Absolute Maximum Ratings at Ta = 25°C Parameter Supply voltage 1 Supply voltage 2 Output peak current Output current Logic input voltage EMO input voltage Symbol VM max VCC max IO peak IO max VIN VEMO tw ≤ 10ms, duty 20% Conditions Ratings 38 6 1.75 1.5 -0.3 to VCC+0.3 -0.3 to VCC+0.3 Unit V V A A V V Continued on next page. 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. If you should intend to use our products for applications outside the standard applications of our customer who is considering such use and/or outside the scope of our intended standard applications, please consult with us 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. 90507 MS PC / 61307 MS PC 20070411-S00007 No.A0814-1/24 LV8741V Continued from preceding page. Parameter Allowable power dissipation 1 Allowable power dissipation 2 Operating temperature Storage temperature *1 Specified circuit board : 90×90×1.7mm3 Symbol Pd max1 Pd max2 Topr Tstg : glass epoxy printed circuit board Independent IC * Our recommended two-layer substrate *1, *2 Conditions Ratings 0.55 2.9 -20 to +85 -55 to +150 Unit W W °C °C *2 For mounting to the backside by soldering, refer the precautions. Recommended Operating Conditions at Ta = 25°C Parameter Supply voltage range 1 Supply voltage range 2 VREF input voltage range Symbol VM VCC VREF Conditions Ratings 9.5 to 35 2.7 to 5.5 0 to VCC-1.8 Unit V V V Electrical Characteristics at Ta = 25°C, VM = 24V, VCC = 5V, VREF = 1.5V Parameter Standby mode current drain 1 Current drain 1 Standby mode current drain 2 Current drain 2 VCC low-voltage cutoff voltage Low-voltage hysteresis voltage Thermal shutdown temperature Thermal hysteresis width Symbol IMstn IM ICCstn ICC VthVCC VthHIS TSD ΔTSD Design guarantee Design guarantee ST = ”L” ST = ”H”, OE = ”H”, no load ST = ”L” ST = ”H”, OE = ”H”, no load 2.2 100 Conditions min Ratings typ 150 0.75 110 2.5 2.35 150 180 40 max 200 1 160 3 2.5 200 μA mA μA mA V mV °C °C Ω Ω μA V V μA μA V 0.8 Step 0(When initialized : channel 1 comparator level) Step 1 (Initial state+1) Step 2 (Initial state+2) Step 3 (Initial state+3) 1-2 phase drive Step 0 (When initialized: channel 1 comparator level) Step 2 (Initial state+1) 1-2 phase (full torque) drive Step 0 (Initial state, channel 1 comparator level) Step 2 (Initial state+1) 2 phase drive Chopping frequency Current setting reference voltage Fchop VRF00 VRF01 VRF10 VRF11 VREF pin input current Iref Step 2 RCHOP = 20kΩ ATT1 = L, ATT2 = L ATT1 = H, ATT2 = L ATT1 = L, ATT2 = H ATT1 = H, ATT2 = H VREF = 1.5V 0.485 0.485 45 0.485 0.323 0.237 0.155 -0.5 0.5 0.5 62.5 0.5 0.333 0.25 0.167 0.515 0.515 75 0.515 0.343 0.263 0.179 V V kHz V V V V μA Continued on next page. 0.323 0.485 0.333 0.5 0.343 0.515 V V 0.485 0.323 0.155 0.485 0.5 0.333 0.167 0.5 0.515 0.343 0.179 0.515 V V V V 0.485 0.5 0.515 V V Unit Output on-resistance Ronu Rond IO = 1.5A, Upper-side on resistance IO = 1.5A, Lower-side on resistance 0.5 0.5 0.8 0.8 50 Output leakage current Diode forward voltage 1 Diode forward voltage 2 Logic pin input current IOleak VD1 VD2 IINL IINH ID = -1.0A ID = -1.5A VIN = 0.8V VIN = 5V 3 30 2.0 1 1.1 8 50 1.3 1.5 15 70 Logic high-level input voltage Logic low-level input voltage Current selection reference voltage level W1-2-phase drive VINH VINL No.A0814-2/24 LV8741V Continued from preceding page. Parameter Charge pump VREG5 output voltage VG output voltage Rise time Oscillator frequency Output short-circuit protection EMO pin saturation voltage Iemo = 1mA 50 100 mV Vreg5 VG tONG Fosc VG = 1μF RCHOP = 20kΩ 90 IO = -1mA 4.5 28 5 28.7 5 125 5.5 29.8 10 150 V V ms kHz Symbol Conditions min Ratings typ max Unit Package Dimensions unit : mm (typ) 3333 TOP VIEW 15.0 44 23 SIDE VIEW BOTTOM VIEW (4.7) 5.6 7.6 (3.5) 1 (0.68) 0.65 0.22 22 0.2 1.7MAX SIDE VIEW 0.1 (1.5) 0.5 SANYO : SSOP44K(275mil) No.A0814-3/24 LV8741V 4.0 Pd max – Ta *1 With components mounted on the exposed die-pad board *2 With no components mounted on the exposed die-pad board Allowable power dissipation, Pd max – W 3.0 Two-layer circuit board 1 *1 2.90 Two-layer circuit board 2 *2 2.0 2.05 1.51 1.0 1.07 0 – 20 0 20 40 60 80 100 Ambient temperature, Ta – °C Substrate Specifications (Substrate recommended for operation of LV8741V) Size : 90mm × 90mm × 1.7mm (two-layer substrate [2S0P]) Material : Glass epoxy Copper wiring density : L1 = 90% / L2 = 95% 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 95% 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.A0814-4/24 LV8741V Pin Assignment CP2 1 CP1 2 VCC 3 VREG5 4 ATT2 5 ATT1 6 NC 7 EMO 8 CEM 9 EMM 10 RCHOP 11 44 VM 43 VG 42 PGND 41 NC 40 GND 39 NC 38 NC 37 OUT1A 36 VM1 35 RF1 34 OUT1B LV8741V MONI 12 RST 13 STP/DC22 14 FR/DC21 15 MD2/DC12 16 NC 17 MD1/DC11 18 DM 19 OE 20 ST 21 VREF 22 Top view 33 OUT2A 32 VM2 31 RF2 30 OUT2B 29 NC 28 NC 27 GND 26 NC 25 NC 24 NC 23 SGND No.A0814-5/24 Block Diagram CP2 OUT1A VM2 OUT2A OUT2B CP1 VG RF1 OUT1B VM1 RF2 VM Charge pump + - PGND Output preamplifier stage Output preamplifier stage Output preamplifier stage MONI Regulator VREG5 LV8741V Output control logic + Attenuator (4 levels selectable) Oscillation circuit Current selection (W1-2/1-2/ 1-2Full/2) + Current selection (W1-2/1-2/ 1-2Full/2) Output preamplifier stage EMO CEM VREF + - VCC + - SGND RCHOP ST ATT1 TSD LVS ATT2 MD1/ MD2/ FR/ STP/ RST OE DC11 DC12 DC21 DC22 DM EMM No.A0814-6/24 LV8741V Pin Functions Pin No. 36 37 34 35 32 33 30 31 42 12 14 22 18 16 13 20 15 6 5 21 44 3 23 11 19 4 2 1 43 8 10 9 27,40 7, 17, 24, 25, 26, 28, 29, 38, 39, 41 Pin name VM1 OUT1A OUT1B RF1 VM2 OUT2A OUT2B RF2 PGND MONI STP/DC22 VREF MD1/DC11 MD2/DC12 RST OE FR/DC21 ATT1 ATT2 ST VM VCC SGND RCHOP DM VREG5 CP1 CP2 VG EMO EMM CEM GND NC Channel 1 motor power supply pin Channel 1 OUTA output pin Channel 1 OUTB output pin Channel 1 current-sense resistor connection pin Channel 2 motor power supply connection pin Channel 2 OUTA output pin Channel 2 OUTB output pin Channel 2 current-sense resistor connection pin Power system ground Position detection monitor pin STM STEP signal input pin/DCM2 output control input pin Constant current control reference voltage input pin STM excitation mode switching pin/DCM1 output control input pin STM excitation mode switching pin/DCM1 output control input pin Reset signal input pin Output enable signal input pin STM forward/reverse rotation signal input pin/DCM2 output control input pin Motor holding current switching pin Motor holding current switching pin Chip enable pin Motor power supply connection pin Logic power supply connection pin Signal system ground Chopping frequency setting resistor connection pin Drive mode (STM/DCM) switching pin Internal power supply capacitor connection pin Charge pump capacitor connection pin Charge pump capacitor connection pin Charge pump capacitor connection pin Output short-circuit state warning output pin Overcurrent mode switching pin Pin to connect the output short-circuit state detection time setting capacitor Ground No Connection (No internal connection to the IC) Description No.A0814-7/24 LV8741V Equivalent Circuits Pin No. 5 6 10 13 14 15 16 18 19 20 21 ATT2 ATT1 EMM RST STP/DC22 FR/DC21 MD2/DC12 MD1/DC11 DM OE ST Pin Equivalent Circuit VCC 5kΩ 100kΩ GND 30 31 32 33 34 35 36 37 42 OUT2B RF2 VM2 OUT2A OUT1B RF1 VM1 OUT1A PGND 36 32 VCC 37 33 34 30 GND 42 1 2 43 44 CP2 CP1 VG VM 35 31 2 44 1 43 VCC 100Ω GND Continued on next page. No.A0814-8/24 LV8741V Continued from preceding page. Pin No. 22 Pin VREF Equivalent Circuit VCC 500Ω GND 4 VREG5 VM 2kΩ 78kΩ 26kΩ GND 12 MONI VCC 500Ω GND Continued on next page. No.A0814-9/24 LV8741V Continued from preceding page. Pin No. 8 EMO Pin Equivalent Circuit VCC GND 9 CEM VCC 500Ω GND 11 RCHOP VCC GND 1kΩ No.A0814-10/24 LV8741V 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 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 (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) Constant-current control reference voltage setting function ATT1 Low High Low High ATT2 Low Low High High Current setting reference voltage VREF/3×100% VREF/3×67% VREF/3×50% VREF/3×33% The voltage input to the VREF pin can be switched to four-step settings as the reference voltage for setting the output current. This is effective for reducing power consumption when motor holding current is supplied. Set current value calculation method The reference voltage is set by the voltage applied to the VREF pin and the two inputs ATT1 and ATT2. The output current (output current at a constant-current drive current ratio of 100%) can be set from this reference voltage and the RF resistance value. IOUT = (VREF/3 × Voltage setting ratio)/RF resistor (Example) When VREF = 1.5V, setting current ratio = 100% [(ATT1, ATT2) = (Low, Low)] and RF resistor = 0.5Ω, the following output current flows : IOUT = 1.5V/3 × 100%/0.5Ω = 1A No.A0814-11/24 LV8741V (4) Reset function RST High Low Operating mode Normal operation Reset state RST STEP MONI RESET 1ch output 0% 2ch output Initial state When the RST pin is set Low, the output excitation position is forced to the initial state, and the MONI output also goes Low. When RST is set High after that, the excitation position proceeds to the next STEP input. (5) Output enable function OE Low High Operating mode Output OFF Output ON OE STEP MONI Power save mode 1ch output 0% 2ch output Output is high-impedance When the OE pin is set Low, 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. Therefore, when OE is returned to High, the output level conforms to the excitation position proceeded by the STEP input. No.A0814-12/24 LV8741V (6) 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. (7) 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.A0814-13/24 LV8741V (8) Output current vector locus (one step is normalized to 90 degrees) 100.0 θ4 θ3 θ2 (2-phase/ 1-2 phase full torque) Channel 1 phase current ratio (%) 66.7 θ2 33.3 θ1 θ0 0.0 0.0 33.3 66.7 Channel 2 current ratio (%) 100.0 Setting current ration in each excitation mode STEP W1-2 phase (%) Channel 1 θ0 θ1 θ2 θ3 θ4 0 33.3 66.7 100 100 Channel 2 100 100 66.7 33.3 0 100 0 100 0 66.7 66.7 100 100 100 100 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.A0814-14/24 LV8741V (9) 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.A0814-15/24 LV8741V 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.A0814-16/24 LV8741V (10) 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