1/4 rev. b structure silicon monolithic integrated circuit product series pwm driver for combi drive type bd7790kvt function ? 3-phase-sensor-less system, therefore don?t need three hall sensors for spindle motor driver. L ? stability high-speed start from the stat e of the stop for spindle motor driver. absolute maximum ratings parameter symbol limits unit power mos supply voltage pvcc 6 v control circuit power supply voltage vcc 6 v maximum driver output current iomax 3 1 a power dissipation pd 1.37 2 w operating temperature range topr -30 85 storage temperature range tstg -55 150 joint part temperature tjmax 150 #1 the current is guaranteed 3.0a in case of the current is turned on/off in a duty-ratio of less than 1/10 with a maximum on-time of 5ms and when short brake. #2 pcb (70mm 70mm 1.6mm,occupied copper foil is less than 3%,glass epoxy standard board) mounting. reduce power by 11.0mw for each degree above 25 . recommended operating conditions(ta=-30 +85 ) set the power supply voltage taking allo wable dissipation into considering parameter symbol min typ max unit power mos supply voltage pvcc 4.0 5.0 5.5 v control circuit power supply voltage vcc 4.0 5.0 5.5 v this product isn?t designed for pr otection against radioactive rays.
2/4 rev. b electrical characteristics (unless otherwise noted ta=25 , vcc=pvcc=5v, vref=1.25v, rl(act,stp,load)=8 +47 h, rl(sp)=2 +47 h, rnf=0.2 , ctl1,2=3.3v, gvsw=0v, vin1,2,3,4,5,6=open, vcom=open, vccom=open, vcout=open) parameter symbol min. typ. max. unit condition circuit current quiescent current icc 8 20 ma ctl1,2=h current in standby mode ist 0.2 ma ctl1,2=l actuator driver block input dead zone (one side) vdzact1,2,3 3 mv output offset voltage voo1,2,3 -50 50 mv voltage gain (ch1,2,3) gvc1,2,3 15.5 17.5 19.5 db external input resistor 10k output on resistor top and bottom ron1,2,3 1.2 1.8 io=500ma pwm frequency f1,2,3ch 215 310 405 khz stepping driver block input dead zone (one side) vdz4,5 10 30 50 mv output offset voltage voo4,5 -50 50 mv voltage gain gvc4,5 15.5 17.5 19.5 db output on resistor top and bottom ron4,5 1.6 2.4 io=500ma pwm frequency f4,5ch 215 310 405 khz loading driver block input dead zone (one side) vdz6 20 60 100 mv ctl1=h, ctl2=l output offset voltage voo6 -50 50 mv ctl1=h, ctl2=l voltage gain gvc6 15.5 17.5 19.5 db ctl1=h, ctl2=l output on resistor top and bottom ron6 1.8 2.7 io=500ma, ctl1=h, ctl2=l pwm frequency f6ch 215 310 405 khz ctl1=h, ctl2=l spindle driver block input dead zone of gm1(one side) vdzsp1 2 30 100 mv input dead zone of gm2(one side) vdzsp2 6 90 300 mv gvsw=m input dead zone of gm3(one side) vdzsp3 10 150 500 mv gvsw=h input output gain 1 gm1 0.88 1.1 1.32 a/v input output gain 2 gm2 0.28 0.36 0.44 a/v gvsw=m input output gain 3 gm3 0.17 0.22 0.27 a/v gvsw=h output on resistor top and bottom ronsp 0.6 1.4 io=500ma output limit voltage vlimsp 0.18 0.22 0.26 v pwm frequency fsp 167 khz others vref drop mute on threshold voltage vmvref 0.7 1.0 v vcc drop mute on threshold voltage vmvccd 3.2 3.6 4.0 v ctl1 l voltage vctl1l 0 1.0 v ctl1 h voltage vctl1h 2.0 3.3 v ctl2, gvsw l voltage vctl2l, vgvl 0 1.0 v ctl2, gvsw m(hi-z) voltage vctl2m, vgvm 1.6 2.0 v open hi-z is also available. ctl2, gvsw h voltage vctl2h, vgvh 2.6 3.3 v gvsw l m hi-z h gain mode gm1 gm2 gm3 ctl1 ctl2 brake mode spindle output ch1,2,3 output ch4,5 output ch6 output l l D hi-z hi-z hi-z hi-z m short brake active hi-z hi-z hi-z h active active active hi-z h l reverse brake hi-z hi-z active active m hi-z active hi-z hi-z hi-z h active active active hi-z please supply the middle level voltage for ctl2 when using it in the mode of ctl1=l and ctl2=m. package outlines (unit : mm) bd7790
3/4 rev. b block diagram / application circuit pre driver nf amp vo1f vo1r in1 cnf1 pre driver nf amp vo2f vo2r cnf2 pre driver logic nf amp vo3f vo3r cnf3 42 power mos power mos power mos pvcc1 5v logic in2 logic in3 osc pvcc3 osc limit rnf=0.2 u v w pre driver nf amp vo4f vo4r cnf4 pre driver nf amp vo5f vo5r cnf5 fg gvsw gvsw ctl1 stby/bmsw vref power mos 5v power mos pgnd3 5v pvcc22 5v t.s.d. vcc gnd 5v 22 f in4 logic in5 logic insp pre driver power mos pre driver vo6f vo6r pgnd1 in6 power mos osc logic bemf detecter com ccom cout test1 test2 test3 rnf2 m 10k 470 0.047 f 10k 470 0.047 f 10k 470 0.047 f 0.033 f 0.033 f 100k 41 43 40 44 39 45 38 46 37 48 47 22 4 14 15 16 36 ctl2 5 11 6 7 9 10 12 13 2 3 8 33 31 32 34 35 30 19 20 21 27 25 26 29 23 pvcc21 rnf1 24 28 18 17 nf amp logic 1 1000pf pin description pin no. symbol description pin no. symbol description 1 in6 pwm driver (ch6) input 25 u spindle driver output u 2 vo6f pwm driver(ch6) positive output 26 v spindle driver output v 3 vo6r pwm driver(ch6) negative output 27 pvcc22 spindle driver power supply22 4 ctl1 driver logic control input1 28 rnf2 spindle driver current sense output2 5 ctl2 driver logic control input2 29 w spindle driver output w 6 vo1f pwm driver(ch1) positive output 30 pgnd3 pwm driver power ground3 7 vo1r pwm driver(ch1) negative output 31 vo4f pwm driver(ch4) positive output 8 pgnd1 pwm driver power ground1 32 vo4r pwm driver(ch4) negative output 9 vo2f pwm driver(ch2) positive output 33 pvcc3 pwm driver power supply3 10 vo2r pwm driver(ch2) negative output 34 vo5f pwm driver(ch5) positive output 11 pvcc1 pwm driver power supply1 35 vo5r pwm driver(ch5) negative output 12 vo3f pwm driver(ch3) positive output 36 vref reference voltage input 13 vo3r pwm driver(ch3) negative output 37 cnf5 pwm driver (ch5) feedback filter 14 test1 test terminal1 38 cnf4 pwm driver (ch4) feedback filter 15 test2 test terminal2 39 cnf3 pwm driver (ch3) feedback filter 16 test3 test terminal3 40 cnf2 pwm driver (ch2) feedback filter 17 gnd pre unit ground 41 cnf1 pwm driver (ch1) feedback filter 18 vcc pre unit power supply 42 in1 pwm driver (ch1) input 19 cout smoothing capacitor connection terminal(output side) 43 in2 pwm driver (ch2) input 20 ccom smoothing capacitor connection terminal(com side) 44 in3 pwm driver (ch3) input 21 com motor coil center point input terminal 45 in4 pwm driver (ch4) input 22 gvsw control for gain of spindle 46 in5 pwm driver (ch5) input 23 pvcc21 spindle driver power supply21 47 insp spindle driver input 24 rnf1 spindle driver current sense output1 48 fg frequency generator output positive/negative of the output terminals are det ermined in reference to th ose of the input terminals.
4/4 rev. b cautions on use 1 absolute maximum ratings this ic might be destroyed when the absolute maximum ratings, su ch as impressed voltage (pvcc, vcc) or the operating temperatur e range (topr), is exceeded, and whether the destruction is short circuit mode or open circuit mode cannot be specified. please take into consideration the physical countermeasures for safety, such as fusing, if a pa rticular mode that exceeds the absolute maximum rating is assum ed. 2 reverse polarity connection connecting the power line to the ic in reverse polarity (from that recommended) will damage the part. please utilize the direct ion protection device as a diode in the supply line. 3 gnd line the ground line is where the lowest potential and transient voltages are connected to the ic. 4 thermal design do not exceed the power dissipation (pd) of the package spec ification rating under actual operation, and please design enough t emperature margins. 5 short circuit mode between terminals and wrong mounting do not mount the ic in the wrong direction and be careful about the reverse-connection of the power connector. moreover, this ic might be destroyed when the dust short the terminals between them or gnd. 6 radiation strong electromagnetic radiation can cause operation failures. 7 aso (area of safety operation) when using the ic, set the output transistor so that it does not exceed absolute maximum ratings or aso. 8 tsd (thermal shut-down) the tsd is activated when the junc tion temperature (tj) reaches 175 0 c (with +/-25 0 c hysteresis), and the output terminal is switched to hi-z. the tsd circuit designed to shut the ic off to prevent runaway thermal operation. it is not designed to protect or guarantee its operation. do not continue to use the ic after operating this circuit. 9 vcc, gnd and rnf wiring layout vcc, gnd and rnf layout should be as wide as possible and at minimum distance. wire to ground to prevent vcc-pvcc and gnd-pgnd- gnd side of rnf resistor from having common impedance. connect a capacitor between vcc and gnd to stabilize. 10 regarding input pin of the ic this monolithic ic contains p+ isolation and p substrate layers between adjacent elements to keep them isolated. pn junctions a re formed at the intersection of these p layers with the n layers of other elements, creating a parasitic diode or transistor. for example, the relation between each potential is as follows: when gnd > pin a and gnd > pin b, the pn junction operates as a parasitic diode. when pin b > gnd > pin a, the pn junction operates as a parasitic transistor. parasitic diodes can occur inevitably in the structure of the ic . the operation of parasitic diodes can result in mutual interf erence among circuits, operational faults, or physical damage. accord ingly, methods by which parasitic diodes operate, such as applying a voltage that is lower than the gnd (p substrate) voltage to an input pin, should not be used. simplified structure of ic 11 capacitor between vcc and gnd this ic has steep change of the voltage and current because of pw m driver. therefore, the capacitor controls vcc voltage by att aching a capacitor between vcc and gnd. wiring impedance decreases the capaci tors capabilities if the capacitor is far from the ic. ther efore, a capacitor should be placed between vcc and gnd, close to the ic. 12 supply fault, ground fault and short-circuit between output terminals do not short-circuit between any output terminal and supply term inal (supply fault) or ground (ground fault), or between any ou tput terminals (load short-circuit). when mounting the ic on the circuit board, be extremely cautious about the orientation of the ic. if the orientation is mistaken, the ic may break down and produce smoke in some cases. 13 inspection by the set circuit board when testing the ic on an application board, connecting a capacitor to a pin with low impedance subjects the ic to stress. alwa ys discharge capacitors after each process or step. always turn the ic?s powe r supply off before connecting it to, or removing it from a jig or fixture, during the inspection process. ground the ic during assembly steps as an antistatic measure. use simila r precaution when transporting and storing the ic. 14 reverse-rotation braking high-speed rotation may cause reverse-rotation braking. monitor t he voltage applied to the output terminal and consider the rev olutions applied to the reversed-rotation brake. 15 application circuit it is one sample that explains standard operation and usage of th is ic about the described example of the application circuit a nd information on the constant etc. therefore, please be sure to consult with our sales representative in advance before mass production design, when a circuit different from application circ uit is composed of external.
r1120 a www.rohm.com ? 2011 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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