LB1945D

Ordering number : EN7633A Monolithic Digital IC LB1945D Overview PWM Current Control Stepping Motor Driver The LB1945D is a PWM current control stepping motor driver that uses a bipolar drive technique. It is optimal for use with the carriage and paper feed stepping motors used in printers. Functions and Features • PWM current control (external clock) • Digital load current selection function (supports 1-2, W1-2, and 2-phase excitation) • Built-in high and low side diodes • Simultaneous on state prevention function (through-current prevention) • Built-in thermal shutdown circuit • Noise canceling function Specifications Absolute Maximum Ratings at Ta = 25°C Parameter Motor supply voltage Output peak current Output continuous current Logic system supply voltage Logic input voltage range Emitter output voltage range Allowable power dissipation Operating temperature Storage temperature Symbol VBB max IO peak IO max VCC max VIN VE Pd max Topr Tstg Independent IC tW ≤ 20μs Conditions Ratings 30 1.0 0.8 6.0 -0.3 to VCC 1.0 2.8 -20 to +90 -55 to +150 Unit V A A V V V W °C °C 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. 41107 TI PC B8-6489, 6394 No.7633-1/9 LB1945D Recommended Operating Range at Ta = 25°C Parameter Motor supply voltage Logic system supply voltage Reference voltage Symbol VBB VCC VREF Conditions Ratings 10 to 28 4.75 to 5.25 1.5 to 5.0 Unit V V V Electrical Characteristics at Ta = 25°C, VBB = 24V, VCC = 5V, VREF = 5V Parameter Output block Output stage supply current Output saturation voltage 1 Output saturation voltage 2 Output saturation voltage 3 Output saturation voltage 4 Output leakage current IBB ON IBB OFF VO sat1 VO sat2 VO sat3 VO sat4 VO1(leak) VO2(leak) VSUS I1 = 0.8V, I2 = 0.8V, ENABLE = 0.8V ENABLE = 3.2V IO = +0.5A, sink side IO = +0.8A, sink side IO = -0.5A, source side IO = -0.8A, source side VO = VBB, sink side VO = 0V, source side L = 3.9mH, IO = 1.0A* -50 30 V 0.3 0.5 1.6 1.8 0.5 1.0 2.0 0.2 0.5 0.7 1.8 2.0 50 V V V V μA mA Symbol Conditions min Ratings typ max Unit Output sustain voltage Logic block Logic supply current ICC ON ICC OFF VIH VIL IIH IIL VREF/ VSEN IREF ICR TS TSHY I1 = 0.8V, I2 = 0.8V, ENABLE = 0.8V ENABLE = 3.2V 50 7 3.2 70.0 10.0 92 13 mA Input voltage 1.8 VIH = 3.2V VIL = 0.8V I1 = 0.8V, I2 = 0.8V I1 = 3.2V, I2 = 0.8V I1 = 0.8V, I2 = 3.2V VREF = 5.0V, I1 = 0.8V, I2 = 0.8V CR = 1.0V 35 7 9.5 13.5 25.5 17.5 -1.0 170 40 50 10 10 15 30 25 65 13 10.5 16.5 34.5 32.5 V μA Input current Set current control threshold value Reference current CR pin current Thermal shutdown temperature Thermal shutdown hysteresis μA μA °C °C *: The design specification items are design guarantees and are not measured. Package Dimensions unit:mm (typ) 3147C 3.5 Pd max – Ta Independent IC 28 15 Allowable power dissipation, Pd max – W 3.0 2.8 2.5 R1.7 12.7 11.2 8.4 1 20.0 26.75 14 0.4 2.0 1.5 1.34 1.0 4.0 0.5 0 -20 4.0 (1.81) 1.78 0.6 1.0 0 20 40 60 80 100 Ambient temperature, Ta – °C SANYO : DIP28H(500mil) No.7633-2/9 LB1945D Pin Assignment ENABLE1 SUBGND D-GND PHASE1 VREF1 16 13 VREF2 OUTA OUTA VBB 28 27 26 25 24 E1 23 22 21 20 19 18 17 15 LB1945D 1 OUTB 2 OUTB 3 NC 4 SUBGND 5 VBB 6 E2 7 D-GND 8 CR 9 PHASE2 10 ENABLE2 11 IB2 12 IB1 14 S-GND Top view ILB01555 Pin Functions Pin No. 22 5 24 6 27 28 2 1 15 14 4, 25 23 7 8 16 13 20 9 19 10 17, 18 12, 11 21 CR VREF1 VREF2 PHASE1 PHASE2 ENABLE1 ENABLE2 IA1, IA2 IB1, IB2 VCC Chopping is performed at the period of a triangle wave set by the RC circuit connected to this pin. The triangle wave off time is the noise cancellation time. Output current settings. (The output current is determined by providing an input in the range 1.5V to 5V.) Output phase switching inputs High-level input: OUTA = high, OUTA = low Low-level input: OUTA = low, OUTA = high Output on/off control inputs High-level input: Output off Low-level input: Output on Output current setting digital inputs. The output current is set to 1/3, 2/3 or 1 by input high/low levels to these pins. Logic block power supply voltage Pin VBB1 VBB2 E1 E2 OUTA OUTA OUTB OUTB GND S-GND SUBGND D-GND Ground Sense ground IC sub-ground Low side built-in diode ground (anode side) Output pins Output stage power supply voltage High side diode cathode connection The set current is controlled by inserting resistors RE between these pins and ground. Description GND VCC IA2 IA1 NC No.7633-3/9 LB1945D Block Diagram ENABLE2 PHASE2 SUBGND VREF2 VCC IB1 S-GND IB2 Control logic circuit Current selection circuit VBB2 Blanking time OUTB E2 OUTB D-GND VBB1 Thermal shutdown circuit OSC CR D-GND OUTA E1 OUTA Blanking time Control logic circuit Current selection circuit VREF1 ENABLE1 SUBGND PHASE1 GND ILB01559 IA1 IA2 No.7633-4/9 LB1945D Application circuit Motor L 1 2 3 4 5 0.5Ω 6 7 820pF 8 56kΩ 9 10 Logic input 11 12 13 14 IB2 IB1 VREF2 S-GND IA2 18 IA1 17 VREF1 16 GND 15 PHASE2 ENABLE2 PHASE1 20 ENABLE1 19 CR E2 D-GND D-GND 23 VBB 22 OUTB OUTB NC SUBGND VBB OUTA OUTA 28 27 Motor L NC 26 SUBGND 25 0.5Ω E1 24 24V 47 μ F 5V 10 μ F LB1945D VCC 21 Logic input 10 μ F 5V ILB01556 No.7633-5/9 LB1945D Truth Table ENABLE Low Low High PHASE High Low OUTA High Low OFF OUTA Low High OFF I1 Low High Low High I2 Low Low High High Output current Vref/(10 × RE) = IOUT Vref/(15 × RE) = IOUT × 2/3 Vref/(30 × RE) = IOUT × 1/3 0 Note: The output is turned off when ENABLE is high or in the I1 = I2 = high state. Clockwise/counterclockwise Operating Sequence 2-phase excitation drive Clockwise rotation No. 0 1 2 3 PHASE1 0 1 1 0 OUTA 0 1 1 0 OUTA 1 0 0 1 PHASE2 0 0 1 1 0 0 1 1 IA1 = IA2 = IB1 = IB2 = 0 OUTB OUTB 1 1 0 0 Counterclockwise rotation No. 0 1 2 3 PHASE1 0 1 1 0 OUTA 0 1 1 0 OUTA 1 0 0 1 PHASE2 1 1 0 0 1 1 0 0 IA1 = IA2 = IB1 = IB2 = 0 OUTB OUTB 0 0 1 1 Control Sequence 2-phase excitation Table 1 Phase A NO 0 1 2 3 PH1 0 1 1 0 IA2 0 0 0 0 IA1 0 0 0 0 Current value 1 1 1 1 PH2 0 0 1 1 IB2 0 0 0 0 Phase B IB1 0 0 0 0 Current value 1 1 1 1 ENABLE1 = ENABLE2 = 0 1-2 phase excitation - 1/2 step Table 2 Phase A No. 0 1 2 3 4 5 6 7 PH1 0 0 * 1 1 1 * 0 IA2 0 0 1 0 0 0 1 0 IA1 0 1 1 1 0 1 1 1 Current value 1 2/3 0 2/3 1 2/3 0 2/3 PH2 * 0 0 0 * 1 1 1 IB2 1 0 0 0 1 0 0 0 ENABLE1 = ENABLE2 = 0 Phase B IB1 1 1 0 1 1 1 0 1 Current value 0 2/3 1 2/3 0 2/3 1 2/3 No.7633-6/9 LB1945D 1-2 phase Excitation Timing Chart PH1 IA2 IA1 PH2 IB2 IB1 IOUT1 VOUT1 0 IOUT2 1 2 3 4 5 6 7 VOUT2 1 cycle = T ILB01558 No.7633-7/9 LB1945D W1-2 phase excitation - about 1/4 step Table 3 Phase A NO 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 PH1 0 0 0 0 * 1 1 1 1 1 1 1 * 0 0 0 IA2 0 0 0 1 1 1 0 0 0 0 0 1 1 1 0 0 IA1 0 0 1 0 1 0 1 0 0 0 1 0 1 0 1 0 Current value 1 1 2/3 1/3 0 1/3 2/3 1 1 1 2/3 1/3 0 1/3 2/3 1 PH2 * 0 0 0 0 0 0 0 * 1 1 1 1 1 1 1 IB2 1 1 0 0 0 0 0 1 1 1 0 0 0 0 0 1 ENABLE1 = ENABLE2 = 0 Phase B IB1 1 0 1 0 0 0 1 0 1 0 1 0 0 0 1 0 Current value 0 1/3 2/3 1 1 1 2/3 1/3 0 1/3 2/3 1 1 1 2/3 1/3 W1-2 phase Excitation Timing Chart PH IA IA PH IB IB IOUT VOU 0 IOUT VOU 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 cycle = ILB01557 No.7633-8/9 LB1945D Simplified Equations for Determining RC Component Values The equations for setting the RC oscillator circuit rise time (T1) and fall time (T2) are shown below. T1 ≈ 0.44C × R (s) T2 ≈ 0.72 × ( C × R × 1000 )/( R + 1000 ) (s) (C:220 to 4700pF, R = 10 to 150kΩ) The oscillator frequency must be set using the simplified equations shown above. Note that the triangle wave fall time (T2) is also used as the noise canceller time. Motor CR T2 T1 T2 Usage Notes 1. VREF Since the VREF pin is the input pin for the reference voltage that sets the current, applications must be designed so that noise does not appear on this pin. 2. Ground pins Since this IC switches high currents, the following points concerning grounding must be observed. • The fins on the package rear surface, pins 7 and 8, and pins 21 and 22 must all be grounded. • Sections of the circuit that carry large currents must be implemented with wide lines in the printed circuit pattern, and must be physically separated from the small signal system. • The E pin sense resistor (RE) must be position as close as possible to the IC ground (pin 14). • The capacitors between VCC and ground and between VBB and ground must be positioned as close as possible to the VCC and VBB pins on the printed circuit pattern. 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. SANYO Semiconductor Co.,Ltd. strives to supply high-quality high-reliability products, however, any and all semiconductor products fail or malfunction with some probability. It is possible that these probabilistic failures or malfunction could give rise to accidents or events that could endanger human lives, trouble that could give rise to smoke or fire, or accidents that could cause damage to other property. When designing equipment, adopt safety measures so that these kinds of accidents or events cannot occur. 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Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. Upon using the technical information or products described herein, neither warranty nor license shall be granted with regard to intellectual property rights or any other rights of SANYO Semiconductor Co.,Ltd. or any third party. 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 April, 2007. Specifications and information herein are subject to change without notice. PS No.7633-9/9