LB1939T Bip integrated circuit Constant Voltage Drive http://onsemi.com Stepper Motor Driver Application Note Overview The LB1939T is a constant voltage drive for single stepper motor. It is optimal for motor drive in portable system products (Battery drive available). Function Low voltage drive Dual power supply operation Vs=1.6V to 7.5V VDD=1.9V to 6.5V. Single power supply operation Vs=VDD=1.9V to 7.5V. Low saturation voltage Vosat=0.3V at Io=200mA. Supports constant voltage and constant current drive Built-in reference voltage circuit Small and thickness Package TSSOP20 Current consumption 0 uA by standby mode Typical Applications POS terminal Document scanner Security Camera Gas table Pin Assignment Package Diagram unit : mm(typ) 3246 0.5 6.5 20 4.4 6.4 11 0.22 10 0.15 0.08 1 (1.0) 1.2max 0.65 (0.3) SANYO : TSSOP20(225mil) Semiconductor Components Industries, LLC, 2013 December, 2013 1/14 LB1939T Application Note Recommended Soldering Footprint (Unit:mm) Reference Symbol TSSOP20(225mil) eE 5.80 e 0.65 b3 0.32 l1 1.00 Pd max-Ta Pd max - Ta Allowable Power Dissipation, Pd max - mW 1000 Mounted on a Specified board: 114.3mm76.1mm1.6mm glass epoxy 800 800mW 600 400 200 LB1939T 0 LB1940T/U --20 0 20 40 60 Ambient Temperature, Ta- C 80 100 ILB01486 Block Diagram Figure1 One stepping motor drive 2/14 LB1939T Application Note Specifications Absolute Maximum Ratings at Ta = 25 C Parameter Symbol Conditions Ratings Unit Maximum supply voltage VB max VS1, VS2, VDD -0.3 to +10.5 Output applied voltage VOUT max IO max OUT1, OUT2, OUT3, OUT4 -0.3 to +10.5 ｔ≦10msec Allowable power dissipation VIN max Pd max Mounted on a specified board * Operating temperature Topr -20 to +85 C Storage temperature Tstg -55 to +150 C Output Current Input applied voltage V V 400 ENA1, ENA2, IN1, IN2, VC mA -0.3 to +10.5 V 800 mW * Mounted on a Specified board: 114.3mm76.1mm1.6mm, glass epoxy 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 Function-guaranteed voltage range Symbol Conditions Ratings min typ unit max VOPR1 VDD system, VS = 2.0V 1.9 6.5 VOPR2 VS system, VDD = 5.0V 1.6 7.5 V Low level input threshold voltage VIL ENA1, ENA2, IN1, IN2 -0.3 1.0 V High level input threshold voltage VIH ENA1, ENA2, IN1, IN2 2.0 6.0 V Electrical Characteristics at Ta = 25C, VS = 3V, VDD = 5V Parameter Standby current dissipation Symbol ISTB Conditions Ratings min typ VS = VDD = 6.5V unit max 0.1 1.0 0.95 A Regulator output circuit VREF output voltage VREF IOL = 0 to 1mA 0.85 0.9 SVDD output voltage VSVDD IOL = 10mA 4.70 4.8 V VO(sat)1 VDD = 5.0V, VS = 2.0V IO = 200mA (PNP side) 0.20 0.30 V VO(sat)2 VDD = 5.0V, VS = 2.0V IO = 200mA (NPN side) 0.10 0.15 V VOUT1 VDD = 6.0V, VC = 1.5V, VS = 3.5V Io=200mA （PNP Transistor side） 2.8 2.9 3.0 V VOUT2 VDD = 6.0V, VC = VREF, VS = 3.5V Io=200mA （PNP Transistor side） 1.65 1.75 1.85 V IOUT1 VDD = 6.0V, VC = 0.9V, VS = 3.5V Io=200mA （PNP Transistor side） 197 210 223 mA 189 210 231 mA V H bridge output circuit OUT output saturation voltage (at saturation control) OUT output voltage (at constant voltage control) OUT output current (at constant current control) RL = 5 (between OUT-OUT), RFB = 1 IOUT2 VDD = 6.0V, VC = VREF, VS = 3.5V Io=200mA （PNP Transistor side） RL = 5 (between OUT-OUT), RFB = 1 VS system operating current drain1 IS1 VC =SVDD 4 7 mA VS system operating current drain2 IS2 VC =VREF 1.5 3 mA VDD system operating current rain1 IDD1 VC =SVDD ENA1 = 2V 4 7 mA VDD system operating current rain2 IDD2 VC =VREF ENA1 = 2V 4 7 mA VC input voltage range VC 0.1 IVC VDD = 6.0V, VS = 2.0V, VC = 5V 0 IIH VIH = 5.5V IIL VIL = GND VC input current 7 V 50 100 A 70 100 A Control input circuit Control pin maximum input current -1 0 3/14 LB1939T Application Note 4/14 LB1939T Application Note 5/14 LB1939T Application Note Pin function Pin No. 11,20 Pin name VS1,VS2 Pin function Power-supply voltage pin. VS voltage is impressed. The permissible operation voltage is from 1.6 to 7.5(V). The capacitor is connected for stabilization for GND . VC1,VC2 Output voltage set up terminal (1pin 3pin) Output voltage is 1.95 times of VC1, VC2 voltages. 2 SGND Signal GND 4 VREF Reference voltage output terminal (4pin) 5 6 ENA1 ENA2 Motor drive control input pin.(5pin,6pin) It shifts from the stand-by state to a prescribed output operation corresponding to the state of the input when the ENA pin becomes a standby mode by L, the circuit current can be adjusted to 0, and it makes it to H. It is a digital input, and the range of L level input is 0 to 1.0(V) and the range of H level input are 2.0 to 6.0(V). Pull-down resistance 80(kΩ) is built into in the terminal. ENA1 is start up for OUT1-OUT2. ENA2 is start up for OUT3-OUT4. 7 IN1 Motor drive control input pin. Driving control input pin of OUT1 (17pin) and OUT2 (15pin). With built-in pull-down resistance. 8 IN2 Motor drive control input pin. Driving control input pin of OUT3 (14pin) and OUT4 (12pin). With built-in pull-down resistance. 9 10 FC1 FC2 OUTPUT phase compensation for current drive. FC1 is phase compensation pin for OUT1-OUT2. FC2 is phase compensation pin for OUT3-OUT4. It connected capacitor (example:0.001uF-0.01uF) 7 OUT4 Driving output pin. The motor coil is connected between terminal OUT3 (8pin). 8 OUT3 Driving output pin. The motor coil is connected between terminal OUT4 (7pin). 9 OUT2 Driving output pin. The motor coil is connected between terminal OUT1 (10pin). 10 OUT1 Driving output pin. The motor coil is connected between terminal OUT2 (9pin). 1,3 Equivalent Circuit 6/14 LB1939T Application Note Pin No. 19 Pin name SVDD Pin function SVDD is bias terminal when VC1 and VC2 set up voltage. Please confirm application circuit for current drive at page 18 VDD Signal power-supply terminal. VDD voltage is impressed. The permissible operation voltage is from 1.9 to 6.5(V). The capacitor is connected for stabilization for GND. 16 13 RFG1 RFG2 Power GND or current detect terminal. RFG1, RFG2 is Power GND when IC is constant voltage drive. RFG1, RFG2 connected current detect resistor to GND when IC is constant current drive. Equivalent Circuit 7/14 LB1939T Application Note Operation explanation 1. Truth table Input Output ENA IN 1 2 L L H 1 OUT 2 3 4 SVDD Mode 1 2 H L H on Reverse rotation L H L on Forward rotation Standby (current dissipation zero) H A blank means “don’t care”. H L H on Reverse rotation L H L on Forward rotation A blank means “off”. 2. Thermal shutdown function The thermal shutdown circuit is incorporated and the output is turned off when junction temperature Tj exceeds 175C. 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 = 175C (typ) (1)Thermal shutdown temperature The thermal shutdown temperature Ttsd is 175±20C with fluctuations. (2)Thermal shutdown operation The operation of the thermal shutdown circuit is below sentennce. When the chip temperature Tj is in the direction of increasing ,it protect IC by output drive reduce at approximately 175C. (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. 8/14 LB1939T Application Note Design Documentation (1)Voltage magnitude relationship There are no restrictions on the magnitude relationships between the voltage applied to Vcc and ENA1,ENA2,IN1,IN2. (2)Observe the following points when designing the printed circuit board pattern layout. Make the VS and ground (RFG pin) lines as wide and as short as possible to lower the wiring inductance. Insert bypass capacitors between VDD and ground mounted as close as possible to the IC. Insert bypass capacitors between VS and ground mounted as close as possible to the IC. Timing Chart and Operation principal Full-Step (2phase excitation) drive Motor advances 90 degree by inputting 1 step. Half-Step (1-2phase excitation) drive Motor advances 45 degree by inputting 1 step. 9/14 LB1939T Application Note Application Circuit Example 1. Example of applied circuit when one stepping motor with constant voltage drive * Bypass capacitor (C1) connected between VS-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. Bypass capacitor (C2) connected between VDD-GND of all examples of applied circuit recommends the electric field capacitor of 0.1A to 1A. Mount the position where the capacitor is mounted on nearest IC. Phase compensation capacitor (C3) connected between OUT-OUT for constant voltage control. Capacitor value of C3 depends on stepping motor. Please confirm stepping motor operation and Set up capacitor value. Output voltage with constant voltage drive is below in this schematic. Vout=VC ×1.95=0.9×1.95=1.75V (VC=VREF=0.9V) 2. Example of applied circuit when one stepping motor with constant current drive. M R1 R1 11 VS2 10 FC2 12 OUT4 9 FC1 13 RFG2 8 IN2 14 OUT3 15 17 OUT1 OUT2 18 VDD 16 19 SVDD RFG1 20 C1 VS1 C2 vref 4 7 IN1 VC2 3 6 ENA2 SGND 2 5 ENA1 VC1 1 LB1939T C3 C3 Logic input * Bypass capacitor (C1) connected between VS-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. 10/14 LB1939T Application Note Bypass capacitor (C2) connected between VDD-GND of all examples of applied circuit recommends the electric field capacitor of 0.1A to 1A. Mount the position where the capacitor is mounted on nearest IC. Phase compensation capacitor (C3) connected between FC-GND for constant current control. Capacitor value of C3 depends on stepping motor. Please confirm stepping motor operation and Set up capacitor value. Output current with constant current drive is below in this schematic. The voltage input to the VC pin is resistor divided internally (by 70kohm and 20kohm resistor) to 1/4.5 and +input of constant current control amplifier as reference. Input of this constant current control amplifiers is connected , through the wire bond resistor Rb =0.1Ω to the RFG pin . The constant current control circuit operates by comparing voltage of external current detection resistor connected to the RFG pin and reference voltage (VC). Note that the voltage at VA is following formula blow. VA=VC/4.5+Ib×20kΩ = VC/4.5+0.03 Ib: bias current of amplifier=1.5uA. Therefore OUTPUT current Io is following expression below. Io=VA/(RFB+Rb) ＝(VC/4.5+0.03)/(RFB+Rb) For example, if constant current is used with application circuit with Fig 2 VC=Vref =0.9V, if R1 is 1Ω then output current can be calculated as following below expression. Io=(0.9/4.5+0.03)/（1+0.1） ＝(0.23/1.1) ＝0.209A If the value driven load resistance RL is r, RFG pin voltage is 0.23V and npn transistor output saturation voltage is 0.1V (typ), pnp transistor output voltage can be calculated as follows. Vout=(RFGpin voltage)+(npn transistor output saturation voltage)+(voltage of motor terminal ) =0.23+0.1+0.209×r =0.33+0.209×r At the same time, however this IC`s internal constant voltage controls the output voltage as follows. Vout`=VC×1.95 Therefore, it will not be possible to use the constant current mode if the value of r is sp that Vout is greater than Vout’. That is, the condition. 0.33+0.209×r>1.75 Implies that r>6.79 This means that constant current control can be used when the value of the load resistance used is strictly less than 6.79ohm. 11/14 LB1939T Application Note Evaluation Board Manual OUT4 VS2 11 12 OUT4 9 FC1 10 FC2 IN2 OUT3 13 RFG2 8 IN2 14 OUT3 7 IN1 IN1 15 16 RFG1 6 ENA2 OUT2 5 ENA1 ENA1 ENA2 17 vref 4 18 VDD OUT1 VC2 3 19 SGND 2 SVDD VC1 1 VS1 20 OUT1 OUT2 1. Evaluation Board circuit diagram Our provided Eva board is constant voltage mode. Please contact RFG1-terminal and RFG2-terminal and PGND-terminal. Therefore R1 resistor and C4 capacitor is not mount evaluation board. If Eva board use constant current driving, Please Eva board changing below It remove C3 capacitor and mount R1 and C4 parts. Finally contact RFG-Io and PGND. Bill of Materials for LB1939T Evaluation Board Designator Manufacturer Manufacturer Part Number Substitutio n Allowed SUN Electronic Industries 50ME10HC Yes ±10% Murata GRM188R72A104KA35 * Yes Yes 0.1µF, 100V ±10% Murata GRM188R72A104KA35 * Yes Yes 10000pF, 50V ±5% Murata GRM188B11H103KA01 D Yes Yes 1.0Ω 1/4W ±1% Yes Yes No Yes Quantity Description C1 1 VS Bypass Capacitor 10µF, 50V C2 1 VCC Bypass Capacitor 0.1µF, 100V 2 output voltage stabilization Capacitor 2 frequency control for current drivr R1 2 Output current Sensing resistor IC1 1 Motor Driver ON Semiconductor LB1939T SW1-SW7 4 Switch MIYAMA MS-621C-A01 TP1-TP18 16 Test Point MAC8 ST-1-3 C3 C4 Value Tolerance Footprint Lead Free MCR10EZHFL1R00 ROHM 12/14 LB1939T Application Note 2. 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 LB1939T evaluation board when driving stepping motor Full-Step Drive LB1939T Full-Step (VCC=3.3V, 200pps) 13/14 LB1939T Application Note ON Semiconductor and the ON logo are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of SCILLC’s product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent-Marking.pdf. SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner. 14/14