LV8711T

Ordering number : ENA1685 LV8711T Overview Bi-CMOS LSI PWM Constant-Current Control Stepping Motor Driver The LV8711T is a PWM constant-current control stepping motor driver. Features • Two circuits of PWM constant-current control H-bridge drivers incorporated • Control of the stepping motor to 1-2 phase excitations possible • Reference voltage output: 1.0V • Short circuit protection circuit incorporated • Abnormal condition warning output pin incorporated • Upper and lower regenerative diodes incorporated •Thermal shutdown circuit incorporated Specifications Absolute Maximum Ratings at Ta = 25°C Parameter Motor supply voltage Logic supply voltage Logic input voltage Output peak current Output continuous current Allowable power dissipation Operating temperature Storage temperature Symbol VM max VCC max VIN IO peak IO max Pd max Topr Tstg Per ch, tw ≤ 10ms, duty 20% Per ch * Conditions Ratings 18 6 6 1.0 800 1.45 -20 to +85 -55 to +150 Unit V V V A mA W °C °C * Specified circuit board : 57.0mm×57.0mm×1.7mm, glass epoxy printed circuit 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. 33110 SY 20100310-S00001 No.A1685-1/12 LV8711T Recommended Operating Ratings at Ta = 25°C Parameter Motor supply voltage range Logic supply voltage range Logic input voltage range VREF input voltage range Symbol VM VCC VIN VREF Conditions Ratings 4 to 16 2.7 to 5.5 -0.3 to VCC+0.3 0 to VCC-1.8 Unit V V V V Electrical Characteristics at Ta = 25°C, VM = 12V, VCC = 3.3, VREF = 1.0V Parameter General Standby mode current drain IMstn ICCstn Current drain IM ICC Thermal shutdown temperature Thermal hysteresis width VCC low voltage cutting voltage Low voltage hysteresis voltage Reference voltage REG5 output voltage Output Output on resistance RonU RonD Output leakage current Diode forward voltage Logic input Logic pin input current IINL IINH Logic high-level input voltage Logic low-level input voltage Constant-current control REG1 output voltage VREF input current Current setting reference voltage VREG1 IREF Vtatt00 Vtatt01 Vtatt10 Vtatt11 Chopping frequency CHOP pin threshold voltage Fchop VCHOPH VCHOPL CHOP pin charge/discharge current Output short-circuit protection EMO pin saturation voltage VsatEMO IEMO = 1mA 250 400 mV Ichop VREF = 1.0V VREF = 1.0V VREF = 1.0V VREF = 1.0V VREF = 1.0V Cchop = 220pF 0.95 -0.5 0.192 0.152 0.092 0.032 36 0.6 0.17 7 0.200 0.160 0.100 0.040 45 0.7 0.2 10 0.208 0.168 0.108 0.048 54 0.8 0.23 13 1.0 1.05 V μA V V V V kHz V V μA VINH VINL VIN = 0.8V VIN = 3.3V 4 22 2.0 0.8 8 33 12 45 μA μA V V IOleak VD IO = -800mA, Source-side IO = 800mA, Sink-side VO = 15V ID = -800mA 1.0 0.78 0.32 1.0 0.43 10 1.2 Ω Ω μA V VREG5 4.5 5 5.5 V TSD ΔTSD VthVCC VthHYS PS = “L”, no load PS = “L”, no load PS = “H”, no load PS = “H”, no load Design guarantee Design guarantee 2.1 100 150 1.0 1.7 180 40 2.4 130 2.7 160 1 1 1.5 3.0 μA μA mA mA °C °C V mV Symbol Conditions Ratings min typ max Unit No.A1685-2/12 LV8711T Package Dimensions unit : mm (typ) 3260A 6.5 24 13 2.0 Pd max - Ta Allowable power dissipation, Pd max - W 1.5 1.45 4.4 6.4 0.5 1.0 0.754 0.5 1 0.5 (0.5) 0.22 12 0.15 1.2max Specified circuit board : 57.0 × 57.0 × 1.7mm3 glass epoxy board 0 - 20 0 20 40 60 80 100 0.08 (1.0) SANYO : TSSOP24(225mil) Ambient temperature, Ta - C Pin Assignment OUT1B OUT1A OUT2A OUT2B RNF1 PGND RNF2 VMM IN1A IN1B 24 23 22 21 20 19 IN2A 14 11 18 17 16 15 LV8711T 1 2 3 4 5 6 7 8 9 10 REG1 CHOP VCC REG5 VREF EMO ATT1 ATT2 GND NC VM PS IN2B 13 12 No.A1685-3/12 Block Diagram REG5 RNF1 VMM OUT2A OUT2B RNF2 OUT1A OUT1B VM standard voltage circuit + gate for upside output voltage circuit PGND Output preamplifier stage Output preamplifier stage Output preamplifier stage Output preamplifier stage VCC + Standard voltage REG1 constant current control Output control logic Start circuit EMO Output control logic LV8711T VREF + current switch function constant current control current switch function + TSD LVS GND Oscillator ATT1 ATT2 IN1A IN1B PS CHOP IN2A IN2B No.A1685-4/12 LV8711T Pin Functions Pin No. 8 9 13 14 23 24 Pin Name ATT1 ATT2 IN2B IN2A IN1B IN1A Pin Function Energization current switching pin 1. Energization current switching pin 2 Channel 2 driver output control input pin. Channel 2 driver output control input pin. Channel 1 driver output control input pin. Channel 1 driver output control input pin. Equivalent Circuit VREG5 VCC GND 4 PS Enable input pin. VCC 4 GND 16 17 18 20 21 22 OUT2B RNF2 OUT2A OUT1B RNF1 OUT1A Channel 2 OUTB output pin. Channel 2 current sensing resistor connection pin. Channel 2 OUTA output pin. Channel 1 OUTB output pin. Channel 1 current sensing resistor connection pin. Channel 1 OUTA output pin. VM 22 18 20 16 GND 3 REG5 Internal reference voltage output pin. 21 17 VCC 3 GND Continued on next page. No.A1685-5/12 LV8711T Continued from preceding page. Pin No. 5 Pin Name EMO Pin Function Abnormal condition warning output pin. Equivalent Circuit VCC 5 SGND 6 VREF Channel 1 and 2 current setting reference voltage input pin. VCC 6 GND 7 REG1 Current setting reference voltage output pin. VREG5 7 GND 10 CHOP Chopping frequency setting capacitor connection pin. VCC GND 10 No.A1685-6/12 LV8711T Input pin function (1) Chip enable function Standby mode / operating mode of the IC are switched by setting the PS pin. In the standby-state, the IC enters a power saving mode and all logic is reset. In the standby-state, internal regulator circuit is not operative. PS Low or Open High Condition Standby mode Operating mode Internal regulator Standby Operating (2) STM output control logic Parallel input IN1A(2A) Low High Low High IN1B(2B) Low Low High High OUT1A(2A) OFF High Low Low Output OUT1B(2B) OFF Low High Low Current direction Output OFF OUTA to OUTB OUTB to OUTA Brake(DCM mode) (3) Constant-current setting The constant-current control setting consist of the VREF voltage setting and resistor (RNF) connected between RNF and ground. The current is set according to the following equation. IOUT [A] = VREF [V] / 5 / RNF [Ω] Also, the voltage applied to the VREF pin can be switched to four stages settings by the state of two inputs of the ATT1 and ATT2 pins. This function is effective for power saving when the motor holding current is applied. Attenuation function of the VREF input voltage ATT1 Low High Low High ATT2 Low Low High High Current setting reference voltage attenuation ratio 100% 80% 50% 20% The output current calculation method for using of attenuation function of the VREF input voltage is as below. IOUT = (VREF / 5) х Attenuation ratio / RNF resistance e.g. When the VREF is 1.0V and the set reference voltage is 100% [(ATT1, ATT2) = (Low, Low)] and the RNF resistance is 0.47Ω, the following output current is set. IOUT = 1.0V / 5 х 100% / 0.47Ω = 425mA In this conditions, when (ATT1, ATT2) is set to (High, High), IOUT = 425mA х 20% = 85mA Therefore, the power saving is executable by attenuation of the output current when motor holding current is supplied. (4) Setting the chopping frequency For constant-current control, chopping operation is made with the frequency determined by the external capacitor (connected to the CHOP pin). The chopping frequency to be set with the capacitor connected to the CHOP pin (pin 10) is as shown below. Chopping period: Tchop Tchop ≈ C х V х 2 / I [s] V: Threshold voltage Typ, 0.5V I : Charge / discharge current Typ. 10μA Chopping frequency: Fchop Fchop ≈ 1 / Tchop [Hz] No.A1685-7/12 LV8711T (5) Constant-current control time chart (chopping operate) In each current mode, the operation sequence is as described below: · At first of chopping cycle, the IC goes to CHARGE mode. (The Blanking section in which the CHARGE mode is forced regardless of the magnitudes of the coil current (ICOIL) and the set current (IREF) exists for 1μs.) · In Blanking section, the IC compares the coil current (ICOIL) and the set current (IREF). If the ICOIL < IREF state is existent in Blanking section. Set current Coil current Forced CHARGE section Chopping cycle Current mode CHARGE SLOW FAST Charge mode continues until ICOIL ≥ IREF. After that the IC switches to SLOW DECAY mode and then switches to FAST DECAY mode for the last about 1μs. If the ICOIL < IREF state is non-existent in Blanking section. Set current Coil current Forced CHARGE section Chopping cycle Current mode CHARGE SLOW FAST The IC switches to SLOW DECAY after Blanking section, and then switches to FAST DECAY mode for the last about 1μs. The IC repeats the above operation. No.A1685-8/12 LV8711T (6) Typical current waveform in each excitation mode 6-1) STM Drive mode Two-phase excitation (CW mode) IN1A IN1B IN2A IN2B (%) 100 IOUT1 0 -100 (%) 100 IOUT2 0 -100 1-2 phase excitation (CW mode) IN1A IN1B IN2A IN2B (%) 100 lOUT1 0 -100 (%) 100 lOUT2 0 -100 No.A1685-9/12 LV8711T 6-2) DCM Drive mode IN1A(2A) IN1B(2B) (%) 100 lOUT1(2) 0 -100 (%) CW BRAKE CCW BRAKE OFF (7) Output short-circuit protection To protect IC from damage due to short-circuit of the output caused by lightening or ground fault, the output short-circuit protection circuit to put the output in the OFF mode is incorporated. 7-1) Protective function operation (Latch method) When detecting the output short-circuit state, the short-circuit protection circuit is activated. When short-circuit state is detected ≈ 4μs (count by the internal timer), detected output is OFF at the time. Then, when the output exceeds the timer latch time counted by the internal counter, the output is ON. Still, the short circuit state is detected, the IC switches all output to stand-by mode and keep the state. This state is released by setting PS = Low (8) Abnormal condition warning output pin EMO, warning output pin of thermal shutdown circuit and the output short-circuit protection circuit, is an open-drain output. EMO outputs ON when output short-circuit is detected. When detecting the output overdrive, the EMO outputs ON. If the junction temperature goes down at the time, EMO outputs OFF automatically. (9) Recommended power-on sequence Provide a wait time of 10μs or more after VCC power supply rises before supplying VM power supply. Provide a wait time of 10μs or more after VM power supply raises before setting the PS pin High. VCC VM PS The above power-on sequence is only a recommendation, and there are no risks of damage or over current to the IC even if this sequence is not followed. No.A1685-10/12 LV8711T Application Circuit Example 1 2 3 Logic input Abnomal condition sensing monitor It is a pull-up resistor for Abnomal condition sensing monitor. The setting range is 10k‰ to 100k‰ The REG1 voltage (1V) can be used to set output current. It can connect to VREF directly or after divided with resistors. The setting range (total) is 10k‰ to 100k‰ Please refer to P.7 for details. It sets the PWM frequency. The setting range is 100pF to 500pF Please refer to P.8 for details. VM NC REG5 PS EMO VREF REG1 ATT1 ATT2 CHOP VCC GND IN1A 24 Logic input IN1B 23 OUT1A 22 RNF1 OUT1B 21 20 It is a resistor to detect output current The setting range is 0.1‰ to 1‰ Please refer to P.7 for details. 4 5 6 7 8 9 220pF 10 11 12 Each constant setting method for the above circuit diagram example is as follows : Current LIMIT (100%) set VREF = 1.0V (when internal regulator output is connected) ILIMIT = VREF / 5 / RNF resistance = 1.0V / 5 / 0.47Ω = 425mA Chopping frequency setting Fchop = Ichop / (Cchop × Vt × 2) = 10μA/ (220pF × 0.5V × 2) = 45 kHz LV8711T VMM 19 OUT2A 18 RNF2 OUT2B PGND M 17 16 15 IN2A 14 IN2B Logic input 13 No.A1685-11/12 LV8711T 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 March, 2010. Specifications and information herein are subject t o change without notice. PS No.A1685-12/12