Stepper Motor Driver IC MTD Series MTD1121F Unipolar PWM Stepper Motor Driver Features ● Unipolar stepper motor driver ● Constant current control function（Fixed OFF Time） ● Logic supply voltage 3.3V ● TTL, CMOS compatible input ● 4-Phase input (Simultaneous ON prevention function) ● Built-in flywheel diodes ● Surface mount package with heat sink(HSOP28) HSOP28 ■Absolute maxmum ratings / Ta=25℃ Parameter Symbol Rating Unit Output voltage Output current VCEO(SUS) 80 V IOUT 1.2 A Logic supply Vcc 0∼3.6 V Logic input VLOGIC 0∼Vcc V Power dissipation * PD 3 W Storage temperature Tstg -40∼150 ℃ Maximum Junction temperature Tj 150 ℃ *50.8×50.8×1mm3 Glass Epoxy Board(FR4),250mm2 Cupper Pattern ■Pin Assignment MTD1121F 1 2 3 4 5 6 7 28 27 26 25 24 23 22 8 9 10 11 12 13 14 21 20 19 18 17 16 15 PG A IN A IN A Vs A Vref A CR A Vcc IN A or B OUT A or B OUT A or B L L OFF OFF L H OFF ON H L ON OFF H H OFF OFF GND COM NC NC NC OUT B Rs B OUT B IN A or B TOP VIEW GND OUT A Rs A OUT A NC NC NC NC ■Truth table Shindengen Electric Mfg.Co.Ltd LG CR B Vref B Vs B IN B IN B PG B W1001 Stepper Motor Driver IC MTD1121F ■Electrical Characteristics Ta=25℃,Vcc=3.3V unless otherwise specified Parameter Symbol Condition MIN TYP MAX Unit Output transistor saturation voltage VCE(SAT) Ic=0.9A - 1.1 1.5 V Output transistor leak current ICER VCER=80V - - 10 μA Flywheel diode forward drop VFFW IFFW=0.9A - 1.2 1.5 V Flywheel diode leak current IRFW VRFW=80V - - 10 μA Flyback diode forward drop VFFB IFFB=0.9A - 1.3 2 V Flyback diode leak current IRFB VRFB=80V - - 10 μA Logic supply current Icc - 30 100 mA IN"H" input voltage VINH 2.0 - Vcc V IN"L" input voltage VINL GND - 0.6 V IN"H" input current IINH VIN=3.3V - - 10 μA IN"L" input current IINL VIN=0V - -10 -50 μA Vref input current Iref Vref=0V - -1 -50 μA Vs input current Isence Vs=0V - - -50 μA Chopping frequency fCHOP - 20 - kHz Oneshot off time tOFF 12 20 27 μs Vs maximum voltage Vs(max) - - 0.7 V Rt=15kΩ , Ct=2200pF ■Recommended operation conditions Parameter Symbol Recommendation Unit Junction temperature Tj -25∼120 ℃ Logic supply Vcc 3.13∼3.46 V Load supply Vmm ∼27.5 V Chopping frequency fCHOP ∼27 kHz ■Thermal resistance Symbol Rating Unit θja * 41 ℃/W * 50.8×50.8×1mm3 Glass Epoxy Board(FR4),250mm2 Cupper Pattern Shindengen Electric Mfg.Co.Ltd W1001 Stepper Motor Driver IC MTD1121F ■Block diagram / Typical application Vz Vcc 1 Vcc CPU or GATE ARRAY OUT A COM OUT B OUT B IN A IN B IN A IN B CR A ONE SHOT Ct OUT A Vmm + Vref A Rt Vcc R1 + Vs A Rs A PG A TAB PG B Rs B Vs B Vref B CPU or GATE ARRAY ONE CR B SHOT LG Rt Rf Rf Cf Rs Rs Cf R2 ●Constant chopping current level ●Recommended component values Symbol Vref Ichop = Rs ●One shot off time Recommended value Unit Rs 0.68 Ω Cf 3300 pF Rf 1.0 kΩ Ct 3300 pF Rt 8.2 kΩ Vz Vmm×1.2∼1.5 V R1+R2 ＜10 ｋΩ toff = 0.69×Ct×Rt Shindengen Electric Mfg.Co.Ltd W1001 Ct Stepper Motor Driver IC MTD1121F ■Outline Drawing (Unit : mm) Shindengen Electric Mfg.Co.Ltd W1001 Stepper Motor Driver IC ! ! MTD1121F Although we are constantly making every effort to improve the quality and reliability of our products, there nevertheless remains a certain probability that the semiconductor products may occasionally fail or malfunction. Please take careful precautions against product failures or malfunctions to avoid any injuries, fire accidents or social loss by implementing safety designs such as redundancy designs, designs for fi re spread prevention, and designs for preventing malfunctions. Our semiconductor products listed in this document are not designed or manufactured to be used in devices or systems requiring extremely high levels of quality and reliability, or the failure or malfunction of which may directly threaten human lives or cause injury. In the cases where the products are to be used in devices or systems for special applications or devices or systems for specialized applications shown below, always make sure to consult us in advance. Special Applications Transportation devices (automotive, marine, etc.), communication devices for core network, traffic signal devices, fire prevention/anticrime devices, various safety devices, medical devices, etc. Specialized Applications Nuclear power control systems, aircraft and aerospace devices, submarine relay devices, and systems for preserving life, etc. Even if it is not for a special or specialized application, when IC products are to be used for devices or systems that are desired to last for a long period under continuous operation, please make sure to consult our sales representative in advance. ● We reserve the right to make any changes to the contents of this manual without prior notice in accordance with modifications to IC products. ● Details of specifications should be exchanged at the adoption of the IC products. ● All information included in this manual is believed to be accurate and reliable. However, our company takes no responsibility for any injury or damage incurred when using the IC products as described in this manual. Neither do we take any responsibility for issues arising from infringement of patent or other rights caused by using this manual. ● The provision of this manual does not guarantee the right to use any third party's patent or other rights, or grant permission to use the patent or other rights of our company. ● No part of this manual may be reproduced or copied without the specific written consent of Shindengen Electric Mfg. Co., Ltd. Shindengen Electric Mfg.Co.Ltd W1001