1/8 www.rohm.com 2012.02 - rev. a ? 2012 rohm co., ltd. all rights reserved. stepping motor driver series high voltage series stepping motor drivers BD6422EFV (parallel-in type) bd6425, bd6423efv (clk-in type) description these products are a low power consumpti on pwm constant current-drive driver of bipolar stepping motor with power supply?s rated voltage of 45v and rate d output current of 1.0a, 1.5a. feature 1) power supply: one system drive (rated voltage of 45v) 2) rated output current: 1.0a, 1.5a 3) low on resistance dmos output 4) clk-in drive mode (bd6425/6423efv) 5) parallel in drive mode (BD6422EFV) 6) pwm constant current c ontrol (other oscillation) 7) built-in spike noise blanking function (external noise filter is unnecessary) 8) full step & half step (two kinds), applicable to quarter step 9) current decay mode switching functi on (4 kinds of fast/slow decay ratio) 10) normal rotation & reverse rotation switching function (bd6425/6423efv) 11) power save function 12) built-in logic input pull-down resistor 13) power-on reset function(bd6425/6423efv) 14) thermal shutdown circuit (tsd) 15) over current protection circuit (ocp) 16) under voltage lock out circuit (uvlo) 17) malfunction prevention at the time of no app lied power supply (ghost supply prevention) 18) electrostatic discharge: 8kv (hbm specification) 19) microminiature, ultra-thin and high heat-radiation (exposed metal type) htssop package application serial dot impact printer ? sewing machine etc. absolute maximum ratings(ta=25 ) item symbol bd6425efv bd6423/6422efv unit supply voltage v cc1,2 -0.2 +45.0 -0.2 +45.0 v power dissipation pd 1.45 1 1.1 3 w 4.70 2 4.0 4 w input voltage for control pin v in -0.2 +5.5 -0.2 +5.5 v rnf maximum voltage v rnf 0.7 0.7 v maximum output current i out 1.5 5 1.0 5 a/phase operating temperature range t opr -25 +85 -25 +85 storage temperature range t stg -55 +150 -55 +150 junction temperature t jmax +150 +150 1 70mm 70mm 1.6mm glass epoxy board. derating in done at 11.6mw/ for operating above ta=25 . 2 4-layer recommended board. derating in done at 37.6mw/ for operating above ta=25 . 3 70mm 70mm 1.6mm glass epoxy board. derating in done at 8.8mw/ for operating above ta=25 . 4 4-layer recommended board. derating in done at 32.0mw/ for operating above ta=25 . 5 do not, however exceed pd, aso and tjmax=150 . no.12009eat06
technical note 2/8 BD6422EFV, bd6423efv, bd6425efv www.rohm.com 2012.02 - rev. a ? 2012 rohm co., ltd. all rights reserved. operating conditions( (ta= -25 +85 ) item symbol bd6425efv bd6423/6422efv unit supply voltage v cc1,2 19~42 v maximum output current (dc) i out 1.2 6 0.7 6 a/phase 6 do not however exceed pd, aso. electrical characteristics (unless otherwise specified ta=25 ? v cc1,2 =37v) item symbol limit unit condition min. typ. max. whole circuit current at standby i ccst - 1.0 2.5 ma ps=l circuit current i cc - 2.0 5.0 ma ps=h, vref=3v control input h level input voltage v inh 2.0 - - v l level input voltage v inl - - 0.8 v h level input current i inh 35 50 100 av in =5v l level input current i inl -10 0 - av in =0v output (out1a, out1b, out2a, out2b) output on resistance(bd6425efv) r on - 1.10 1.43 i out =1.0a,sum of upper and lower output on resistance(bd6423/6422efv) r on - 2.00 2.60 i out =0.5a,sum of upper and lower output leak current i leak - - 10 a current control rnfxs input current (bd6425efv) i rnfs -2.0 -0.1 - a rnfxs=0v rnfx input current i rnf -40 -20 - a rnfx=0v vref input current i vref -2.0 -0.1 - avref=0v vref input voltage range v ref 0 - 3.0 v minimum on time (blank time) t onmin 0.5 1.5 3.0 s c=470pf, r=82k bd6425/6423efv comparator threshold v cth 0.57 0.60 0.63 v vref=3v BD6422EFV comparator threshold 100% v cth100 0.57 0.60 0.63 v vref=3v, (i0x,i1x)=(l,l) comparator threshold 67% v cth67 0.38 0.40 0.42 v vref=3v, (i0x,i1x)=(h,l) comparator threshold 33% v cth33 0.18 0.20 0.22 v vref=3v, (i0x,i1x)=(l,h)
technical note 3/8 BD6422EFV, bd6423efv, bd6425efv www.rohm.com 2012.02 - rev. a ? 2012 rohm co., ltd. all rights reserved. terminal function and application circuit diagram 1) bd6425efv pin no. pin name function pin no. pin name function 1 gnd ground terminal 15 clk clock input terminal for advancing the electrical angle. 2 out1b h bridge output terminal 16 cw_ccw motor rotating direction setting terminal 3 rnf1 connection terminal of resistor for output current detection 17 test terminal for testing (used by connecting with gnd) 4 rnf1s input terminal of current limit comparator 18 mode0 motor excitation mode setting terminal 5 out1a h bridge output terminal 19 mode1 motor excitation mode setting terminal 6 nc non connection 20 enable power supply terminal 7 vcc1 power supply terminal 21 nc non connection 8 nc non connection 22 vcc2 power supply terminal 9 gnd ground terminal 23 nc non connection 10 cr connection terminal of cr for setting chopping frequency 24 out2a h bridge output terminal 11 dec1 current decay mode setting terminal 25 rnf2s input terminal of current limit comparator 12 dec2 current decay mode setting terminal 26 rnf2 connection terminal of resistor for output current detection 13 vref output current value setting terminal 27 out2b h bridge output terminal 14 ps power save terminal 28 nc non connection fig.1 block diagram & application circuit diagram of bd6425efv 0.3 predriver 7 vcc1 blank time pwm control translator 2bit dac tsd uvlo regulator reset 9 gnd 10 cr 12 dec2 14 ps 15 clk 18 mode0 19 mode1 11 dec1 16 cw_ccw 20 enable vref 13 2 out1b 5 out1a 3 rnf1 22 vcc2 24 out2a 1 gnd 27 out2b 26 rnf2 17 test control logic mix decay control rnf1 rnf2 ocp osc 0.3 terminal for testing. please connect to gnd. 82k 470pf set the chopping frequency. setting range is c:330pf 1500pf r:15k ? 200k bypass capacitor. setting range is 100uf 470uf(electrolytic) 0.01uf 0.1uf(multilayer ceramic etc.) be sure to short vcc1 & vcc2. resistor for current. detecting. setting range is 0.2 ? 0.4 . 100uf logic input terminal. set the output currenet. input by resistor divison. logic input terminal. for setting current decay mode power save terminal. 4 rnf1s 25 rnf1s 0.1uf resistor for current. detecting. setting range is 0.2 ? 0.4 .
technical note 4/8 BD6422EFV, bd6423efv, bd6425efv www.rohm.com 2012.02 - rev. a ? 2012 rohm co., ltd. all rights reserved. 2) bd6423efv pin no. pin name function pin no. pin name function 1 gnd ground terminal 13 clk clock input terminal for advancing the electrical angle. 2 out1b h bridge output terminal 14 cw_ccw motor rotating direction setting terminal 3 rnf1 connection terminal of resistor for output current detection 15 test terminal for testing (used by connecting with gnd) 4 out1a h bridge output terminal 16 mode0 motor excitation mode setting terminal 5 vcc1 power supply terminal 17 mode1 motor excitation mode setting terminal 6 nc non connection 18 enable output enable terminal 7 gnd ground terminal 19 nc non connection 8 cr connection terminal of cr for setting pwm frequency 20 vcc2 power supply terminal 9 dec1 current decay mode setting terminal 21 out2a h bridge output terminal 10 dec2 current decay mode setting terminal 22 rnf2 connection terminal of resistor for output current detection 11 vref output current value setting terminal 23 out2b h bridge output terminal 12 ps power save terminal 24 nc non connection fig.2 block diagram & application circuit diagram of bd6423efv 0.5 predriver 5 vcc1 blank time pwm control translator 2bit dac tsd uvlo regulator reset 7 gnd 8 c r 10 dec2 12 ps 13 cl k 16 mode0 17 mode1 9 dec1 14 cw_ccw 18 enable vref 11 2 out1b 4 out1a 3 rnf1 20 vcc2 21 out2a 1 gnd 23 out2b 22 rnf2 15 test control logic mix decay control rnf1 rnf2 ocp osc 0.5 terminal for testing. please connect to gnd. resistor for current. detecting. setting range is 0.4 ? 0.8 . 82k 470pf set the pwm frequency. setting range is c:330pf 1500pf r:15k ? 200k bypass capacitor. setting range is 100uf 470uf(electrolytic) 0.01uf 0.1uf(multilayer ceramic etc.) be sure to short vcc1 & vcc2. resistor for current. detecting. setting range is 0.4 ? 0.8 . 100uf logic input terminal setting output current input by resistance division. logic input terminal for setting current decay mode power save terminal. 0.1uf
technical note 5/8 BD6422EFV, bd6423efv, bd6425efv www.rohm.com 2012.02 - rev. a ? 2012 rohm co., ltd. all rights reserved. 3) BD6422EFV pin no. pin name function pin no. pin name function 1 gnd ground terminal 13 phase1 phase selection terminal 2 out1b h bridge output terminal 14 i01 vref division ratio setting terminal 3 rnf1 connection terminal of resistor for output current detection 15 i11 vref division ratio setting terminal 4 out1a h bridge output terminal 16 phase2 phase selection terminal 5 vcc1 power supply terminal 17 i02 vref division ratio setting terminal 6 nc non connection 18 i12 vref division ratio setting terminal 7 gnd ground terminal 19 nc non connection 8 cr connection terminal of cr for setting pwm fr eque n cy 20 vcc2 power supply terminal 9 dec1 current decay mode setting terminal 21 out2a h bridge output terminal 10 dec2 current decay mode setting terminal 22 rnf2 connection terminal of resistor for output current detection 11 vref output current value setting terminal 23 out2b h bridge output terminal 12 ps power save terminal 24 nc non connection fig.3 block diagram & application circuit diagram of BD6422EFV predriver 5 vcc1 blank time pwm control 2bit dac tsd uvlo regulator 7 gnd 8 c r 10 dec2 12 ps 13 phase1 16 phase2 14 i01 9 dec1 15 i11 17 i02 vref 11 2 out1b 4 out1a 3 rnf1 20 vcc2 21 out2a 1 gnd 23 out2b 22 rnf2 control logic mix decay control rnf1 rnf2 ocp osc 0.5 0.5 100uf 0.1uf resistor for current. detecting. setting range is 0.4 ? 0.8 . 82k 470pf set the pwm frequency. setting range is c:330pf 1500pf r:15k ? 200k bypass capacitor. setting range is 100uf 470uf(electrolytic) 0.01uf 0.1uf(multilayer ceramic etc.) be sure to short vcc1 & vcc2. resistor for current. detecting. setting range is 0.4 ? 1.0 . i12 18 logic input terminal. setting output current. input by resistance division. logic input terminal. for setting current decay mode power save terminal.
technical note 6/8 BD6422EFV, bd6423efv, bd6425efv www.rohm.com 2012.02 - rev. a ? 2012 rohm co., ltd. all rights reserved. usage notes (1) absolute maximum ratings an excess in the absolute maximum ratings, such as supply vo ltage, temperature range of operating conditions, etc., can break down the devices, thus making impossible to identify br eaking mode, such as a short circuit or an open circuit. if any over rated values will expect to exceed the absolute ma ximum ratings, consider adding circuit protection devices, such as fuses. (2) connecting the power supply connector backward connecting of the power supply in reverse polarity can damage ic. take precautions when connecting the power supply lines. an external direction diode can be added. (3) power supply lines design pcb layout pattern to provide low impedance gnd and supply lines. to obtain a low noise ground and supply line, separate the ground section and supply li nes of the digital and analog blocks. furthermore, for all power supply terminals to ics, connect a capacitor between the power supply and the gnd terminal. when applying electrolytic capacitors in the circuit, not that capacitance characteristic values are reduced at low temperatures. (4) gnd potential the potential of gnd pin must be minimu m potential in all operating conditions. (5) metal on the backside (define the side w here product markings are printed as front) the metal on the backside is shorted with the backside of ic ch ip therefore it should be connec ted to gnd. be aware that there is a possibility of malfunction or destruction if it is shorted wi th any potential other than gnd. (6) thermal design use a thermal design that allows for a suffic ient margin in light of the power dissipa tion (pd) in actual operating conditions. users should be aware that these produc ts have been designed to expose their frames at the back of the package, and should be used with suitable heat dissipation treatment in th is area to improve dissipation. as large a dissipation pattern should be taken as possible, not only on the front of the baseboard but also on the back surface. it is important to consider actual usage conditions and to take as large a dissipation pattern as possible. (7) inter-pin shorts and mounting errors when attaching to a printed circuit board, pay close attention to the direction of the ic and displacement. improper attachment may lead to destruction of the ic. there is also possibility of destruction from short circuits which can be caused by foreign matter entering between out puts or an output and the power supply or gnd. (8) operation in a strong electric field use caution when using the ic in the presence of a strong electr omagnetic field as doing so may cause the ic to malfunction. (9) aso when using the ic, set the output transistor so that it does not exceed absolute maximum ratings or aso. (10) thermal shutdown circuit the ic has a built-in thermal shutdown circuit (tsd circuit). if the chip te mperature becomes tjmax=150 , and higher, coil output to the motor will be open. the tsd circuit is des igned only to shut the ic of f to prevent runaway thermal operation. it is not designed to protect or indemnify peri pheral equipment. do not use the tsd function to protect peripheral equipment. tsd on temperature [ ] (typ.) hysteresis temperature [ ] (typ.) 175 25 (11) inspection of the application board during inspection of the application board, if a capacitor is connected to a pin with low impedance there is a possibility that it could cause stress to the ic, t herefore an electrical discharge should be performed after each process. also, as a measure again electrostatic discharge, it should be earthed during the assembly process and special care should be taken during transport or storage. furthermore, when connecti ng to the jig during the inspection process, the power supply should first be turned off and then removed before the inspection.
technical note 7/8 BD6422EFV, bd6423efv, bd6425efv www.rohm.com 2012.02 - rev. a ? 2012 rohm co., ltd. all rights reserved. (12) input terminal of ic this ic is a monolithic ic, and between each element there is a p+ isolation for element partition and a p substrate. this p layer and each element?s n layer make up the p-n junction, and various parasitic elements are made up. for example, when the resistance and transistor are connected to the terminal as shown in figure 4, when gnd (terminal a) at the resistance and gnd (terminal b) at the transistor (npn), the p-n junction operates as a parasitic diode. also, when gnd (terminal b) at the transistor (npn) the parasitic npn transistor operates with the n la yers of other elements close to the aforementioned parasitic diode. because of the ic?s structure, the creation of parasitic elements is inevitable from the electrical potential relationship. the operation of parasitic elements causes interference in circ uit operation, and can lead to malfunction and destruction. therefore, be careful not to use it in a way which causes t he parasitic elements to operate, such as by applying voltage that is lower than the gnd (p s ubstrate) to the input terminal. fig. 4 pattern diagram of parasitic element (13) ground wiring patterns when using both small signal and large current gnd pattern s, it is recommended to isolate the two ground patterns, placing a single ground point at the application's reference point so that the pattern wiring resistance and voltage variations caused by large currents do not cause variations in the small signal ground voltage. be careful not to change the gnd wiring pattern potential of any external components, either. (14) test terminal (bd6425/6423efv) be sure to connect test pin to gnd. resistor transistor (npn) n n n p + p + p p substrate gnd parasitic element pin a n n p + p + p p substrate gnd parasitic element pin b c b e n gnd pin a p aras iti c element pin b other adjacent elements e b c gnd p aras iti c element
technical note 8/8 BD6422EFV, bd6423efv, bd6425efv www.rohm.com 2012.02 - rev. a ? 2012 rohm co., ltd. all rights reserved. ordering part number b d 6 4 2 2 e f v - e 2 ??` efv=htssop-b24(bd6423efv /BD6422EFV) efv=htssop-b28(bd6425efv) ??`?? e2: `???`? (unit : mm) htssop-b24 0.65 1.0max 0.85 0.05 0.08 0.05 0.24 +0.05 - 0.04 0.08 m s 0.08 1.0 0.2 0.53 0.15 0.17 +0.05 - 0.03 4 + 6 ? 4 s 24 13 112 0.325 (3.4) (5.0) 7.8 0.1 7.6 0.2 5.6 0.1 (max 8.15 include burr) 1pin mark ? order quantity needs to be multiple of the minimum quantity. embossed carrier tape (with dry pack) tape quantity direction of feed the direction is the 1pin of product is at the upper left when you hold reel on the left hand and you pull out the tape on the right hand 2000pcs e2 () direction of feed reel 1pin ? order quantity needs to be multiple of the minimum quantity. embossed carrier tape (with dry pack) tape quantity direction of feed the direction is the 1pin of product is at the upper left when you hold reel on the left hand and you pull out the tape on the right hand 2500pcs e2 () direction of feed reel 1pin (unit : mm) htssop-b28 0.08 m 0.08 s s 1.0 0.2 0.5 0.15 4 + 6 ? 4 0.17 +0.05 - 0.03 15 28 14 1 (2.9) 4.4 0.1 (5.5) (max 10.05 include burr) 0.625 6.4 0.2 9.7 0.1 1pin mark 1.0max 0.65 0.85 0.05 0.08 0.05 0.24 +0.05 - 0.04
r1120 a www.rohm.com ? 2012 rohm co., ltd. all rights reserved. notice rohm customer support system http://www.rohm.com/contact/ thank you for your accessing to rohm product informations. more detail product informations and catalogs are available, please contact us. notes no copying or reproduction of this document, in part or in whole, is permitted without the consent of rohm co.,ltd. the content specified herein is subject to change for improvement without notice. the content specified herein is for the purpose of introducing rohm's products (hereinafter "products"). if you wish to use any such product, please be sure to refer to the specifications, which can be obtained from rohm upon request. examples of application circuits, circuit constants and any other information contained herein illustrate the standard usage and operations of the products. the peripheral conditions must be taken into account when designing circuits for mass production. great care was taken in ensuring the accuracy of the information specified in this document. however, should you incur any damage arising from any inaccuracy or misprint of such information, rohm shall bear no responsibility for such damage. the technical information specified herein is intended only to show the typical functions of and examples of application circuits for the produc ts. rohm does not grant you, explicitly or implicitly, any license to use or exercise intellectual property or other rights held by rohm and other parties. rohm shall bear no responsibility whatsoever for any dispute arising from the use of such technical information. the products specified in this document are intended to be used with general-use electronic equipment or devices (such as audio visual equipment, office-automation equipment, commu- nication devices, electronic appliances and amusement devices). the products specified in this document are not designed to be radiation tolerant. while rohm always makes efforts to enhance the quality and reliability of its products, a product may fail or malfunction for a variety of reasons. please be sure to implement in your equipment using the products safety measures to guard against the possibility of physical injury, fire or any other damage caused in the event of the failure of any product, such as derating, redundancy, fire control and fail-safe designs. rohm shall bear no responsibility whatsoever for your use of any product outside of the prescribed scope or not in accordance with the instruction manual. the products are not designed or manufactured to be used with any equipment, device or system which requires an extremely high level of reliability the failure or malfunction of which may result in a direct threat to human life or create a risk of human injury (such as a medical instrument, transportation equipment, aerospace machinery, nuclear-reactor controller, fuel- controller or other safety device). rohm shall bear no responsibility in any way for use of any of the products for the above special purposes. if a product is intended to be used for any such special purpose, please contact a rohm sales representative before purchasing. if you intend to export or ship overseas any product or technology specified herein that may be controlled under the foreign exchange and the foreign trade law, you will be required to obtain a license or permit under the law.
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