Ordering number : EN7633A Monolithic Digital IC LB1945D PWM Current Control Stepping Motor Driver Overview 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 Symbol Motor supply voltage VBB max Output peak current IO peak Output continuous current Logic system supply voltage Conditions Ratings Unit 30 V 1.0 A IO max 0.8 A VCC max 6.0 V tW ≤ 20μs Logic input voltage range VIN -0.3 to VCC V Emitter output voltage range VE 1.0 V Allowable power dissipation Pd max 2.8 W Operating temperature Topr Independent IC -20 to +90 °C Storage temperature Tstg -55 to +150 °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 Symbol Motor supply voltage Conditions Ratings Unit VBB 10 to 28 V Logic system supply voltage VCC 4.75 to 5.25 V Reference voltage VREF 1.5 to 5.0 V Electrical Characteristics at Ta = 25°C, VBB = 24V, VCC = 5V, VREF = 5V Parameter Symbol Ratings Conditions min typ Unit max Output block IBB ON IBB OFF I1 = 0.8V, I2 = 0.8V, ENABLE = 0.8V Output saturation voltage 1 VO sat1 IO = +0.5A, sink side 0.3 0.5 V Output saturation voltage 2 VO sat2 IO = +0.8A, sink side 0.5 0.7 V Output saturation voltage 3 VO sat3 IO = -0.5A, source side 1.6 1.8 V VO sat4 IO = -0.8A, source side 1.8 2.0 V 50 μA Output stage supply current Output saturation voltage 4 Output leakage current Output sustain voltage 0.5 1.0 2.0 ENABLE = 3.2V mA 0.2 VO1(leak) VO2(leak) VO = VBB, sink side VO = 0V, source side -50 VSUS L = 3.9mH, IO = 1.0A* 30 I1 = 0.8V, I2 = 0.8V, ENABLE = 0.8V 50 70.0 92 7 10.0 13 V Logic block ICC ON ICC OFF Logic supply current ENABLE = 3.2V VIH VIL Input voltage Input current mA 3.2 V 1.8 IIH VIH = 3.2V VIL = 0.8V IIL 35 50 65 7 10 13 Set current control threshold VREF/ I1 = 0.8V, I2 = 0.8V 9.5 10 10.5 value VSEN I1 = 3.2V, I2 = 0.8V 13.5 15 16.5 I1 = 0.8V, I2 = 3.2V 25.5 30 34.5 25 32.5 μA μA Reference current IREF VREF = 5.0V, I1 = 0.8V, I2 = 0.8V 17.5 CR pin current ICR CR = 1.0V -1.0 Thermal shutdown temperature TS 170 °C TSHY 40 °C Thermal shutdown hysteresis μA *: The design specification items are design guarantees and are not measured. Package Dimensions unit:mm (typ) 3147C Pd max – Ta 15 12.7 11.2 R1.7 0.4 8.4 28 1 14 20.0 4.0 4.0 26.75 (1.81) 1.78 0.6 Allowable power dissipation, Pd max – W 3.5 3.0 2.8 2.5 2.0 1.5 1.34 1.0 0.5 0 -20 1.0 Independent IC 0 20 40 60 80 100 Ambient temperature, Ta – °C SANYO : DIP28H(500mil) No.7633-2/9 LB1945D 21 GND 22 VREF1 23 IA1 D-GND 24 IA2 E1 25 ENABLE1 SUBGND 26 PHASE1 NC 27 VCC OUTA 28 VBB OUTA Pin Assignment 20 19 18 17 16 15 9 10 11 12 13 14 S-GND VREF2 IB1 IB2 ENABLE2 8 CR 7 D-GND 6 E2 5 VBB 4 SUBGND 3 NC OUTB 2 OUTB 1 PHASE2 LB1945D Top view ILB01555 Pin Functions Pin No. Pin 22 VBB1 5 VBB2 24 E1 6 E2 27 OUTA 28 OUTA 2 OUTB 1 OUTB Description Output stage power supply voltage High side diode cathode connection The set current is controlled by inserting resistors RE between these pins and ground. Output pins 15 GND 14 S-GND Ground Sense ground 4, 25 SUBGND IC sub-ground 23 D-GND Low side built-in diode ground (anode side) 7 8 CR 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. 16 VREF1 13 VREF2 Output current settings. 20 PHASE1 Output phase switching inputs 9 PHASE2 High-level input: OUTA = high, OUTA = low 19 ENABLE1 Output on/off control inputs 10 ENABLE2 High-level input: Output off 17, 18 IA1, IA2 Output current setting digital inputs. 12, 11 IB1, IB2 The output current is set to 1/3, 2/3 or 1 by input high/low levels to these pins. 21 VCC (The output current is determined by providing an input in the range 1.5V to 5V.) Low-level input: OUTA = low, OUTA = high Low-level input: Output on Logic block power supply voltage No.7633-3/9 LB1945D S-GND SUBGND VREF2 IB2 IB1 ENABLE2 PHASE2 VCC Block Diagram Current selection circuit Control logic circuit VBB2 Blanking time OUTB E2 OUTB D-GND Thermal shutdown circuit VBB1 OSC CR D-GND OUTA E1 OUTA Blanking time GND SUBGND IA2 IA1 ENABLE1 PHASE1 VREF1 Current selection circuit Control logic circuit ILB01559 No.7633-4/9 LB1945D Application circuit Motor L Motor L 1 OUTB OUTA 28 2 OUTB OUTA 27 3 NC 4 SUBGND 5 VBB 6 E2 7 D-GND NC 26 SUBGND 25 0.5Ω E1 24 0.5Ω 820pF 8 CR D-GND 23 24V VBB 22 LB1945D 47μF 5V VCC 21 10μF 56kΩ 9 PHASE2 PHASE1 20 10 ENABLE2 ENABLE1 19 11 IB2 IA2 18 12 IB1 IA1 17 13 VREF2 VREF1 16 14 S-GND GND 15 Logic input Logic input 10μF 5V ILB01556 No.7633-5/9 LB1945D Truth Table ENABLE PHASE OUTA Low High High OUTA Low Low Low Low High High - OFF OFF I1 I2 Output current Low Low Vref/(10 × RE) = IOUT High Low Vref/(15 × RE) = IOUT × 2/3 Low High Vref/(30 × RE) = IOUT × 1/3 High High 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 IA1 = IA2 = IB1 = IB2 = 0 No. PHASE1 OUTA OUTA PHASE2 OUTB OUTB 0 0 0 1 0 0 1 1 1 1 0 0 0 1 2 1 1 0 1 1 0 3 0 0 1 1 1 0 No. PHASE1 OUTA OUTA PHASE2 OUTB OUTB 0 0 0 1 1 1 0 1 1 1 0 1 1 0 2 1 1 0 0 0 1 3 0 0 1 0 0 1 Counterclockwise rotation IA1 = IA2 = IB1 = IB2 = 0 Control Sequence 2-phase excitation Table 1 ENABLE1 = ENABLE2 = 0 Phase A NO Phase B PH1 IA2 IA1 Current value PH2 IB2 IB1 Current value 0 0 0 0 1 0 0 0 1 1 1 0 0 1 0 0 0 1 2 1 0 0 1 1 0 0 1 3 0 0 0 1 1 0 0 1 1-2 phase excitation - 1/2 step Table 2 ENABLE1 = ENABLE2 = 0 Phase A No. Phase B PH1 IA2 IA1 Current value PH2 IB2 IB1 Current value 0 0 0 0 1 * 1 1 0 1 0 0 1 2/3 0 0 1 2/3 2 * 1 1 0 0 0 0 1 3 1 0 1 2/3 0 0 1 2/3 4 1 0 0 1 * 1 1 0 5 1 0 1 2/3 1 0 1 2/3 6 * 1 1 0 1 0 0 1 7 0 0 1 2/3 1 0 1 2/3 No.7633-6/9 LB1945D 1-2 phase Excitation Timing Chart PH1 IA2 IA1 PH2 IB2 IB1 IOUT1 VOUT1 0 1 2 3 4 5 6 7 IOUT2 VOUT2 1 cycle = T ILB01558 No.7633-7/9 LB1945D W1-2 phase excitation - about 1/4 step Table 3 ENABLE1 = ENABLE2 = 0 Phase A NO PH1 IA2 Phase B IA1 Current value PH2 IB2 IB1 Current value 0 0 0 0 1 * 1 1 0 1 0 0 0 1 0 1 0 1/3 2 0 0 1 2/3 0 0 1 2/3 3 0 1 0 1/3 0 0 0 1 4 * 1 1 0 0 0 0 1 5 1 1 0 1/3 0 0 0 1 6 1 0 1 2/3 0 0 1 2/3 7 1 0 0 1 0 1 0 1/3 8 1 0 0 1 * 1 1 0 9 1 0 0 1 1 1 0 1/3 10 1 0 1 2/3 1 0 1 2/3 11 1 1 0 1/3 1 0 0 1 12 * 1 1 0 1 0 0 1 13 0 1 0 1/3 1 0 0 1 14 0 0 1 2/3 1 0 1 2/3 15 0 0 0 1 1 1 0 1/3 W1-2 phase Excitation Timing Chart PH IA IA PH IB IB IOUT VOU 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 IOUT VOU 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. Such measures include but are not limited to protective circuits and error prevention circuits for safe design, redundant design, and structural design. In the event that any or all SANYO Semiconductor Co.,Ltd. products described or contained herein are controlled under any of applicable local export control laws and regulations, such products may require the export license from the authorities concerned in accordance with the above law. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, or any information storage or retrieval system, or otherwise, without the prior written consent of SANYO Semiconductor Co.,Ltd. Any and all information described or contained herein are subject to change without notice due to product/technology improvement, etc. When designing equipment, refer to the "Delivery Specification" for the SANYO Semiconductor Co.,Ltd. product that you intend to use. 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