Datasheet 36VHigh-performance, High-reliability Withstan d Voltage Stepping Motor Driver BD68720EFV General Description Key Specifications BD68720EFV is a bipolar low-consumption driver that Range of power supply voltage 1928 V driven by PWM current. Rated power supply voltage of Rated output current (continuous) 2.0 A the device is 36 V, and rated output current is 2.0 A. Rated output current (peak value) 2.5 A PARA-IN driving mode is adopted for input interface, Range of operating temperature -25+85 and excitation mode is corresponding to FULL STEP Output ON resistance (total of 0.65 (Typ.) mode, HALF STEP mode (2 types) and QUARTER upper and lower resistors) STEP mode via a built-in DAC. In terms of current decay, the FAST DECAY/SLOW DECAY ratio may be Package W(Typ.) x D(Typ.)x H(Max.) set without any limitation, and all available modes may HTSSOP-B28 9.70mm x 6.40mm x 1.00mm be controlled in the most appropriate way. In addition, the power supply may be driven by one single system, which simplifies the design. Features Rated output current DC2.0A Low ON resistance DMOS output PARA-IN drive mode PWM constant current (other oscillation) Built-in spike noise cancel function (external noise filter is unnecessary) Full-, half (two kinds)-, quarter-step functionality Freely timing excitation mode switch Current decay mode switch Typical Application circuit linearly variable FAST/SLOW DECAY ratio Normal rotation & reverse rotation switching GND 9 function 15 Power save function PHASE1 14 PS 17 Built-in logic input pull-down resistor PHASE2 16 Power-on reset function I01 18 I11 Thermal shutdown circuit (TSD) 19 I02 Over-current protection circuit OCP 20 I12 Under voltage lock out circuit (UVLO) Over voltage lock out circuit (OVLO) VCC1 7 VREF 13 Ghost Supply Prevention (protects against OUT1A 5 malfunction when power supply is disconnected) 2 OUT1B Adjacent pins short protection 3 Microminiature, ultra-thin and high heat-radiation RNF1 (exposed metal type) package 4 RNF1S VCC2 Applications 22 PPC, multi-function printer, laser beam printer, and OUT2A CR 24 10 ink-jet printer 27 OUT2B Monitoring camera and WEB camera 26 Sewing machine RNF2 MTH 12 Photo printer, FAX, scanner and mini printer 25 RNF2S Toy and robot GND 1 Figure.1 Application circuit Product structure silicon monolithic integrated circuit It is not the radiation-proof design for this product. www .rohm.com TSZ02201-0P2P0B701210-1-2 2016 ROHM Co., Ltd. All rights reserved. 1/20 TSZ22111 14001 10.Jun.2016 Rev.001 BD68720EFV Pin Configuration TOP VIEW Block Diagram 15 PHASE1 TSD OCP GND 1 28 NC 17 PHASE2 GND 9 OVLO UVLO 16 I01 Translator OUT2B OUT1B 2 27 I11 18 RESET 14 PS 19 I02 RNF1 3 26 RNF2 20 I12 RNF1S 4 25 RNF2S VREF 13 2bit DAC OUT1A 5 24 OUT2A VCC1 7 OUT1A 5 NC 6 23 NC RNF1S 2 OUT1B 3 VCC1 7 22 VCC2 RNF1 RNF2S 4 RNF1S Blank time 21 NC NC 8 PWM control VCC2 22 OUT2A CR 24 GND 9 20 I12 10 OSC 27 OUT2B 26 Mix decay CR 19 I02 10 RNF2 MTH 12 control 25 RNF2S NC 11 18 I11 Regulator GND 1 MTH 12 17 PHASE2 VREF 13 16 I01 Figure.3 Block Diagram PS 14 15 PHASE1 Figure.2 Pin configuration Pin Description Pin No. Pin name Function Pin No. Pin name Function 1 GND Ground terminal 15 PHASE1 Phase selection terminal 2 OUT1B H bridge output terminal 16 I01 VREF division ratio setting terminal Connection terminal of resistor for 3 RNF1 17 PHASE2 Phase selection terminal output current detection Input terminal of current limit VREF division ratio setting terminal 4 RNF1S 18 I11 comparator H bridge output terminal VREF division ratio setting terminal 5 OUT1A 19 I02 6 NC Non connection 20 I12 VREF division ratio setting terminal 7 VCC1 Power supply terminal 21 NC Non connection 8 NC Non connection 22 VCC2 Power supply terminal Ground terminal Non connection 9 GND 23 NC Connection terminal of CR for setting H bridge output terminal 10 CR 24 OUT2A chopping frequency 11 NC Non connection 25 RNF2S Input terminal of current limit comparator Connection terminal of resistor for output 12 MTH Current decay mode setting terminal 26 RNF2 current detection 13 VREF Output current value setting terminal 27 OUT2B H bridge output terminal Power save terminal Non connection 14 PS 28 NC www.rohm.com TSZ02201-0P2P0B701210-1-2 2016 ROHM Co., Ltd. All rights reserved. 2/20 TSZ22111 15001 10.Jun.2016 Rev.001 Control logic Predriver