LB1846MC Bi-CMOS integrated circuit 5V Low Saturation Voltage Drive http://onsemi.com Stepper Motor Driver Application Note Overview The LB1846MC is a 1-channel low saturation voltage stepper motor driver IC. It is optimal for motor drive in 5V system products and it can drive a stepping motor in Full-step and Half-step. Also LB1846MC is suitable for use with gas burner for its latch valve drive. The latch valve functions as a safety device to prevent gas leakage. Function BIP output transistor adoption (Upper and lower total Vo(sat)=0.55V(typical) at Io=400mA) For one power supply (The control system power supply is unnecessary.) Our motor driver IC, LB1973JA, and compatible functions It is possible to connect it in parallel (parallel, connected operation of drive ch). The compact package (MFP10SK) is adopted. VCC max = 8v, IO max = 0.8A Current consumption 0 when standing by Built-in Thermal protection function Typical Applications Printer Security camera Label Printer Gas table POS Printer / terminal Document scanner Pin Assignment LB1846MC Semiconductor Components Industries, LLC, 2013 December, 2013 1/14 LB1846MC Application Note Package Dimensions unit : mm (typ) 5.0 0.5 4.4 6.2 10 1 2 1.0 0.15 0.35 0.05 1.55 (1.5) 0.8 MAX SANYO : MFP10SK(225mil) Caution: The package dimension is a reference value, which is not a guaranteed value. Recommended Soldering Footprint (Unit:mm) Reference Symbol MFP10SK(225mil) eE 5.60 e 1.00 b3 0.47 l1 1.00 Block Diagram Figure1 One stepping motor drive 2/14 LB1846MC Application Note Specifications Absolute Maximum Ratings at Ta = 25C Parameter Symbol Conditions Ratings Unit Maximum supply voltage VCC max -0.3 to +8.0 V Output voltage VOUT VCC + VSF V Input voltage VIN Ground pin outflow current IGND Per channel -0.3 to +8.0 800 mA V Allowable power dissipation Pd max When mounted* 870 mW Operating temperature Topr -20 to +75 C Storage temperature Tstg -40 to +150 C *1: When mounted on the specified printed circuit board (114.3mm × 76.2mm × 1.5mm), glass epoxy board Caution 1) Absolute maximum ratings represent the value which cannot be exceeded for any length of time. Caution 2) Even when the device is used within the range of absolute maximum ratings, as a result of continuous usage under high temperature, high current, high voltage, or drastic temperature change, the reliability of the IC may be degraded. Please contact us for the further details. Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. Recommended Operating Conditions at Ta = 25C Parameter Symbol Ratings Conditions min typ Unit max Supply voltage VCC 2.5 7.5 Input high-level voltage VIH 2.5 7.5 V V Input low-level voltage VIL -0.3 +0.7 V Electrical Characteristics at Ta 25C, VCC = 5V Parameter Symbol Current drain Output saturation voltage Input current Ratings Conditions min typ Unit max ICC0 IN1, 2, 3, 4 = 0V 0.1 10 µA ICC1 IN1, 3 = 3V, IN2, 4 = 0V 30 40 mA VOUT1 VIN = 3V or 0V, VCC = 3 to 7.5V, IOUT = 200mA 0.27 0.4 V VOUT2 VIN = 3V or 0V, VCC = 4 to 7.5V, IOUT = 400mA 0.55 0.8 V IIN VIN = 5V 150 200 µA 30 µA 1.7 V Spark Killer Diode Reverse current IS (leak) Forward voltage VSF Pdmax Pd max -- Ta 1000 Allowable power dissipation, Pdmax - mW IOUT = 400mA 870 800 600 522 400 200 0 --20 0 20 40 60 80 100 Ambient temperature, Ta - C board (114.3mm × 76.2mm × 1.5mm), glass epoxy board 3/14 LB1846MC Application Note 4/14 LB1846MC Application Note Pin function Pin No. 1 Pin name VCC Pin function Power-supply voltage pin. VCC voltage is impressed. The permissible operation voltage is from 2.5 to 7.5(V). The capacitor is connected for stabilization for GND pin (6pin). 4 IN1 Motor drive control input pin. Driving control input pin of OUT1 (8pin) and OUT2 (7pin). It combines with IN2 pin (5pin) and it fights desperately. The digital input it, range of the "L" level input is 0 to 0.7(V), range of the "H" level input is from2.5 to 7.5(V). Pull-down resistance 30(kΩ) is built into in the pin. It becomes a standby mode because all IN1, IN2, IN3, and IN4 pins are made "L", and the circuit current can be adjusted to 0. 5 IN2 Motor drive control input pin. Driving control input pin of OUT1 (8pin) and OUT2 (7pin). It combines with IN1 pin (4pin) and it uses it. With built-in pull-down resistance. 3 IN3 Motor drive control input pin. Driving control input pin of OUT3 (9pin) and OUT4 (10pin). It combines with IN4 pin (2pin) and it uses it. With built-in pull-down resistance. 2 IN4 6 10 GND OUT4 Motor drive control input pin. Driving control input pin of OUT3 (9pin) and OUT4 (10pin). It combines with IN3 pin (3pin) and it uses it. With built-in pull-down resistance. Ground pin. Driving output pin. The motor coil is connected between terminal OUT3 (9pin). 9 OUT3 Driving output pin. The motor coil is connected between terminal OUT4 (10pin). 7 OUT2 Driving output pin. The motor coil is connected between terminal OUT1 (8pin). 8 OUT1 Driving output pin. The motor coil is connected between terminal OUT2 (7pin). Equivalent Circuit 5/14 LB1846MC Application Note Operation explanation 1. Output control logic IN1 IN2 IN3 IN4 OUT1 OUT2 OUT3 OUT4 Note L L L L OFF OFF H L L L H L OFF OFF Standby OFF OFF L H L H L H L H L L H L OFF OFF H L L H H L L H H L L H L L L H OFF OFF L H L H L H L H L L L H OFF OFF L H H L L H H L L H 1-2 phase excitation H H The logic output for the first high-level input is produced. *2 H H Note: *1 "-" indicates a "don‛t care" input. *2 If two high levels (H/H) are input to the IN1/IN2 pins with the timing shown in (1) in the figure below, then the IN2 input that arrived later will be ignored and the IC will function as though an H/L combination is applied to the IN1/IN2 pins. Similarly, the timing shown in (2) results in a L/H combination on the IN1/IN2 pins. 2. Thermal shutdown function The thermal shutdown circuit is incorporated and the output is turned off when junction temperature Tj exceeds 200C. As the temperature falls by hysteresis, the output turned on again (automatic restoration). The thermal shutdown circuit does not guarantee the protection of the final product because it operates when the temperature exceed the junction temperature of Tjmax=150C. TSD = 180C (typ) TSD = 20C (typ) (1) Thermal shutdown temperature The thermal shutdown temperature Ttsd is 180±20C with fluctuations. (2) Thermal shutdown operation The operation of the thermal shutdown circuit is shown in the figure below. When the chip temperature Tj is in the direction of increasing (solid line), the output turns off at approximately 180C. When the chip temperature Tj is in the direction of decreasing (dotted line), the output turns on (returns) at approximately 160C. (Thermal shutdown circuit block diagram) The thermal shutdown circuit compares the voltage of the heat sensitive element (diode) with the reference voltage and shuts off the drive circuit at a certain temperature to protect the IC chip from overheating. Note: The above is an example of thermal shutdown circuits although ther are same differences from the actual internal circuit. 6/14 LB1846MC Application Note Design Documentation (1) Voltage magnitude relationship There are no restrictions on the magnitude relationships between the voltage applied to Vcc and IN1 to IN4. 6 GND 7 OUT2 8 OUT1 9 OUT3 OUT4 10 Latch valve (2) Parallel connection The LB1846MC can be used as a single-channel H-bridge power supply by connecting IN1 to IN3, IN2 to IN4, OUT1 to OUT3, and OUT2 to OUT4 as shown in the figure. (Iomax=1.6A, Vo(sat)=0.6V(typical) at Io=800mA) Motor voltage supply (3) + VCC IN4 IN3 IN1 IN2 1 2 3 4 5 LB1846MC 10uF Observe the following points when designing the printed circuit board pattern layout. Make the Vcc and ground lines as wide and as short as possible to lower the wiring inductance. Insert bypass capacitors between Vcc and ground mounted as close as possible to the IC. Resistors of about 10KΩ must be inserted between the CPU output ports and the IN1 to IN4 pins if the microcontroller and the LB1846MC are mounted on different printed circuit boards and the ground potentials differ significantly. 7/14 LB1846MC Application Note Operation principal Full-Step Drive Motor advances 90 degree by inputting 1 step. Phase A + Phase B + (1) Phase A + Phase B – (4) 90deg (3) (2) Phase A – Phase B – Figure 2. Motor electric angle (Full Step Drive) Figure 1. Full-Step Timing Phase A – Phase B + Half-Step Drive Motor advances 45 degree by inputting 1 step. Phase A + Phase B – Phase A + Phase B OFF Phase A + Phase B + (1) (2) (8) Phase A OFF Phase B – 45deg Phase A OFF Phase B + (7) (3) (6) Phase A – Phase B – Figure 3. Half-Step Timing (5) Phase A – Phase B OFF (4) Phase A – Phase B + Figure 4. Motor electric angle (Half Step Drive) 8/14 LB1846MC Application Note Latch valve operation sequence The following diagram shows the example of latch valve sequence from Standby, Forward, Reverse, Forward, and Reverse. When IN1, IN2, IN3, IN4 are "L", the operation of LB1973JA is stopped. Please put standby mode for 10usec between Forward and Reverse. 9/14 LB1846MC Application Note Application Circuit Example 1. Example of applied circuit when two Latch valve driving 2. Example of applied circuit when one stepping motor driving 6 GND 7 OUT2 8 OUT1 9 OUT3 OUT4 10 Latch valve 3. Example of applied circuit when connecting it in parallel The use likened to H-Bridge 1ch is shown possible in the figure below by connecting IN1 with IN3, IN2 with IN4, OUT1 with OUT3, and OUT2 with OUT4. (IO max = 1.6A, Upper and lower total Vo(sat)=0.275V(typ) at Io=800mA) Motor voltage supply + VCC IN4 IN3 IN1 IN2 1 2 3 4 5 LB1846MC 10uF 10/14 LB1846MC Application Note * Bypass capacitor (C1) connected between VCC-GND of all examples of applied circuit recommends the electric field capacitor of 0.1A to 10A. Confirm there is no problem in operation in the state of the motor load including the temperature property about the value of the capacitor. Mount the position where the capacitor is mounted on nearest IC. Evaluation Board Manual 1. Evaluation Board circuit diagram Motor connection terminal LB1846MC VCC （motor power supply ） VIN （control power supply ） Bill of Materials for LB1948MC Evaluation Board Footprint Manufacturer Manufacturer Part Number Substitution Allowed Lead Free MFP10SK (225mil) ON semiconductor LB1846MC No Yes SUN Electronic Industries 50ME10HC Yes Yes Switch MIYAMA MS-621-A01 Yes Yes Test points MAC8 ST-1-3 Yes Yes Designator Qty Description IC1 1 Motor Driver C1 1 VCC Bypass capacitor SW1-SW4 4 TP1-TP12 12 Value 10µF 50V Tol ±20% 11/14 LB1846MC Application Note 2. Two Latch valve drive Connect OUT1 and OUT2, OUT3 and OUT4 to a Latch valve each. Connect the motor power supply with the terminal VCC, the control power supply with the terminal VIN. Connect the GND line with the terminal GND. DC motor becomes the predetermined output state corresponding to the input state by inputting a signal such as the following truth value table into IN1~IN4. See the table in p.6 for further information on input logic. Figure # Latch valve waveform (VCC=2V) 12/14 LB1846MC Application Note 3. One stepping motor drive Connect a stepping motor with OUT1, OUT2, OUT3 and OUT4. Connect the motor power supply with the terminal VCC, the control power supply with the terminal VIN. Connect the GND line with the terminal GND. STP motor drives it in a Full-Step, Half-Step by inputting a signal such as follows into IN1~IN4. For input signal to function generator, refer to p.8. To reverse motor rotation, make sure to input signal to outward direction. Waveform of LB1948MC evaluation board when driving stepping motor Full-Step Drive LB1846MC Full-Step (VCC=12V, 200pps) LB1846MC Half-Step (VCC=12V, 200pps) 13/14 LB1846MC Application Note ON Semiconductor and the ON logo are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). 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