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| product structure silicon monolithic integrated circuit this product is not designed protection against radioactive rays . 1/16 tsz02201-0h1h0b100300-1-2 ? 2012 rohm co., ltd. all rights reserved. 31.jul.2012 rev.002 tsz22111 ? 14 ? 001 www.rohm.co datashee t dc brushless fan motor drivers three-phase full-wave fan motor driver BH67172NUX general description bh67172ux is a three-phase sensorless fan motor driver used to cool off notebook pcs. it is controlled by a variable speed provided through the pwm input signal. its feature is sensorless drive which doesnt require a hall device as a location detection sensor and motor downsizing can be achieved by limiting the number of external components as much as possible. furthermore, introducing a direct pwm soft switched driving mechanism achieves silent operations and low vibrations. features ? speed controllable by pwm input signal ? sensorless drive ? soft switched drive quick start ? power save function ? internal rnf resistance ? quick start function package w (typ.) x d (typ.) x h (max.) vson010x3030 3.00mm x 3.00mm x 0.60mm application ? small fan motor notebook pcs etc. absolute maximum ratings parameter symbol limit unit supply voltage vcc ? 0.3 6.5 v power dissipation pd 464 *1 mw operating temperature topr C25 to +95 c storage temperature tstg C55 to +125 c output current iomax 700 *2 ma fg signal output voltage vfg 6.5 v fg signal output current ifg 6 ma junction temperature tjmax 125 c *1 reduce by 4.64mw/c over ta=25c. (o n 74.2mm74.2mm1.6mm glass epoxy board) *2 this value is not to exceed pd. recommended operating conditions parameter symbol limit unit operating supply voltage range vcc 1.8 to 5.5 v vson010x3030 downloaded from: http:///
2/16 datasheet datasheet BH67172NUX tsz02201-0h1h0b100300-1-2 ? 2012 rohm co., ltd. all rights reserved. 31.jul.2012 rev.002 www.rohm.co tsz22111 ? 15 ? 001 pin configuration pin description ? block diagram p/no. t/name C 1 fg fg output terminal 2 com coil midpoint terminal 3 vcc power supply terminal 4 u u phase output terminal 5 fr forward/reverse switch terminal 6 w w phase output terminal 7 v v phase output terminal 8 gnd gnd terminal 9 tosc start-up oscillation terminal 10 pwm pwm signal input terminal fg pwm fr gnd tsd uvlo osc logic pre bemf det det level com vcc uv w tosc fig.2 block diagram fig.1 pin configuration (top view) fg com vcc u fr pwm tosc gnd v w downloaded from: http:/// 3/16 datasheet datasheet BH67172NUX tsz02201-0h1h0b100300-1-2 ? 2012 rohm co., ltd. all rights reserved. 31.jul.2012 rev.002 www.rohm.co tsz22111 ? 15 ? 001 ? electrical characteristics (unless otherwise specified vcc=5v, ta=25 c) parameter symbol limit unit conditions min. typ. max. circuit current stb icst - 20 50 ua circuit current icc 2.0 4.5 7.0 ma pwm input h level vph 2.5 - vcc v pwm input l level vpl 0 - 0.7 v pwm input current h iph - 0 1 ua pwm=vcc pwm input current l ipl -50 -20 - ua pwm=gnd input frequency fp 20 - 50 khz fr input h level vfrh 2.5 - vcc v fr=h : forward drive fr input l level vfrl 0 - 0.5 v fr=l : reverse drive tosc charge current occ -125 -100 -67 ua tosc=0.5v tosc discharge current odc 67 100 125 ua tosc=1.0v tosc frequency osf 27 38 49 khz tosc-gnd 2200pf pwm off time tpo 500 1000 2000 us output voltage vo - 0.25 0.325 v io 250ma (h.l. total) fg low voltage vfgl - - 0.4 v ifg 5ma lock protection det.time ldt - 0.5 1.0 s lock protection rel.time lrt 2.5 5 10 s lock protection ratio rlt 9 10 - - rel.time/ det.time ratio about a current item, define the inflow cu rrent to ic as a positive notation, and t he outflow current from ic as a negative not ation. downloaded from: http:/// 4/16 datasheet datasheet BH67172NUX tsz02201-0h1h0b100300-1-2 ? 2012 rohm co., ltd. all rights reserved. 31.jul.2012 rev.002 www.rohm.co tsz22111 ? 15 ? 001 typical performance curves(reference data) y a [] c [a] fig.3 circuit current operating range 95c 25c C 25c y a [] c [a] 95c operating range 25c C 25c fig.4 circuit current stb y a [] c a [a] fig.5 tosc charge current 25c C 25c y a [] c a [a] fig.6 tosc discharge current 95c 25c C 25c operating range operating range 95c downloaded from: http:/// 5/16 datasheet datasheet BH67172NUX tsz02201-0h1h0b100300-1-2 ? 2012 rohm co., ltd. all rights reserved. 31.jul.2012 rev.002 www.rohm.co tsz22111 ? 15 ? 001 typical performance curves(reference data) [a] a [] fig.8 output voltage (ta=25c) 5.5v 5v 1.8v [a] a [] fig.7 output voltage (vcc=5v) 95c 25c C 25c [a] a [] fig.9 fg low voltage (vcc=5v) 95c 25c C 25c [a] a [] fig.10 fg output low voltage (ta=25c) 5.5v 5v 1.8v downloaded from: http:/// 6/16 datasheet datasheet BH67172NUX tsz02201-0h1h0b100300-1-2 ? 2012 rohm co., ltd. all rights reserved. 31.jul.2012 rev.002 www.rohm.co tsz22111 ? 15 ? 001 typical performance curves(reference data) y a [] [] fig.11 lock protection rel. time operating range 95c 25c C 25c downloaded from: http:/// 7/16 datasheet datasheet BH67172NUX tsz02201-0h1h0b100300-1-2 ? 2012 rohm co., ltd. all rights reserved. 31.jul.2012 rev.002 www.rohm.co tsz22111 ? 15 ? 001 application circuit example(constant values are for reference) *1 open collector output. a pull-up resistances of 10k ? should be inserted. *2 the wiring patterns from the vcc terminal and gnd termi nal to the bypass capacitor must be routed as short as possible. with respect to the wiring pattern, it has been confirmed that 0.03 ? for 1uf at the bypass capacitor doesnt cause problems under our operation environment. this can be used as a reference value to check for validity. *3 when it is noisy, capacitance should be inserted between u,v,and w. *4 connect a capacitor between tosc terminal andgnd. start-up frequency can be adjusted. connect tosc terminal to gnd. start-up synchronized time is fixed 200ms. ? description of function operation 1) sensorless drive BH67172NUX is a motor driver ic for driving a three-phase brushless dc motor without a hall sensor.detecting a rotor location firstly at startup, an appropriate logic fo r the rotation direction is obtained using this information and given to each phase to rotate the motor. then, the rotation of the motor induces electromotive voltage in each phase wiring and the logic based on the induced electromotive voltage is applied to the each phase to continue rotating. 2) motor output u,v,w and fg output signals in fig.13, the timing charts of the output signals from the u, v and w phases as well as the fg terminal is shown. assuming that a three-slot tetrode motor is used, two pulse outputs of fg are produced for one motor cycle. the three phases are excited in the order of u, v and w phases. fig.13 motor output , fg signal 10k fg pwm fr gnd tsd uvlo osc logic pre bemf det det level com vcc u v w tosc 1 gnd terminal 1uf 2 3 4 fig.12 pwm controllable 4 wires type (fg) motor application circuit motor output u motor output w motor output v downloaded from: http:/// 8/16 datasheet datasheet BH67172NUX tsz02201-0h1h0b100300-1-2 ? 2012 rohm co., ltd. all rights reserved. 31.jul.2012 rev.002 www.rohm.co tsz22111 ? 15 ? 001 output pattern motor output motor output u motor output v motor output w 1 h l hi-z 2 h hi-z l 3 hi-z h l 4 l h hi-z 5 l hi-z h 3 hi-z l h * about the output pattern, it changes in the flow of 1 2 3 6 1 . h; high, l; low, hi-z; high impedance table.1 truth table 3) variable speed operation about rotational speed,it changes by pwm duty of the output of the lower side and upper side. (upper and lower pwm control drive method fig.14) 4) lock protection feature, automatic recovery circuit to prevent passing a coil current on any phase when a motor is locked, it is provided with a functionwhich can turn off the output for a certain period of time and then automatically restore itself to the normaloperation. during the motor rotation, an appropriate logic based on the induced electromotive voltage can becontinuously given to each phase ; on the other hand, when the motor is lock ed, no induced electromotivevoltageis obt ained. utilizing this phenomenon to take a protective against locking, when the in duced electromotive voltage is not detec ted for a predetermined period of time (ton), it is judged that the motor is locked and theoutput is turned off for a predetermined period of time (toff).in fig.15, the timing chart is shown. fig.15 pwm signal and lock protection operation fig.14 motor output pwm drive explanation motor output u a = a motor output w motor output v a = a recover to the normal operation induced electromotive voltage detection output fg on off on detec ting not detecting mot or loc k motor unlock ton toff detec ting recover to the normal operation induced electromotive voltage detection output fg on off on detec ting not detecting mot or loc k motor unlock ton toff detec ting fg fixed hi during motor lock downloaded from: http:/// 9/16 datasheet datasheet BH67172NUX tsz02201-0h1h0b100300-1-2 ? 2012 rohm co., ltd. all rights reserved. 31.jul.2012 rev.002 www.rohm.co tsz22111 ? 15 ? 001 5) power saving function / speed control by pwm input the power saving function is controlled by an input logic of the pwm terminal. (a) operate mode when the pwm terminal is high. (b) standby mode when the pwm terminal is low for a time period of 1ms (typ.). when the pwm terminal is open, high logic is set. input logic of the pwm terminal is set at low and then the standby mode becomes ef fective 1ms (typ.) (fig.16). in the standby mode, the lock protection function is deactivated and the lock protection is not effective. therefore, this device can start up instantly even from the stop state when the input logic of the pwm terminal is set at high. fig.16 the power saving function 6)uvlo under voltage lock out circuit in the operation area under the guaranteed operating power supply voltage of 1.8v (typ.), the transistor on the output can be turned off at a powe r supply voltage of 1.58v (typ.). a hyster esis width of 100mv is provided and a normal operation can be performed at 1. 68v. this function is installed to prevent unpredictable operations, such as a large amount of current passing through the output, by means of intentionally turning off the output during an operation at a very low power supply voltage which may cause an abnormal function in the internal circuit. 7) bemf detection driving mechanism (synchronized start-up mechanism) BH67172NUXs start mechanism is synchronized start-up me chanism. BH67172NUX as bemf detection driving starts by set output logic and monitors bemf voltage of motor. driving mechanism changes to bemf detection driving after detect bemf signal. when bemf signal isnt detected for constant time at start- up, synchronized start-up mechanism outputs output logic forcibly by using standard synchronized signal (sync signal) and makes motor forward drive. this assistance of motor start-up as constant cycle is synchr onized driving mechanism. synchronized frequency is standard synchronized signal. fig.17 ,the timing ch art (outline) is shown. motor star t-up frequency setting generation of synchronized period is shown. motor start-up frequency setting the tosc terminal starts a self-oscillation by connecting a capacitor between the tosc terminal and gnd. it becomes a start-up frequency, and synchronized time. synchronized time can be adjusted by changing external capacitor. when the capacitor value is small, synchronized time becomes short. it is necessary to choose the best capacitor value for optimum start-up operation. for example external capacito r is 2200pf, synchronized time is 200ms(typ.). 2200pf is recommended for setting value at first. relation ship between external capacitor and synchronized time is shown in below. when connect tosc terminal to gnd, synchronized time is fixed and synchronized time is same as 2200pf. setting of appropriate capacitor value appropriate value of synchronized time is differ with characteristic and parameter of motor. appropriate value decided by start-up confirmation with various capacitor value. at first confirm start-up with 2200pf,next is 2400,2700,3000,3300pf ??? ,and 2000,1800,1600,1500,1300pf ??? etc. appropriate capacitor value is decided after confirm maximum start-up ng value and minimum start-up ng value. for example, small bemf voltage motor tends to small capacitor value. set capacito r value after confirm sufficiently. attention : we provide with automatic start-up confirma tion tool. we will supply this tool when you request. lock protection function active inactive active pwm output 1ms on off on standby mode power saving function normal mode normal mode lock protection function active inactive active pwm output 1ms on off on standby mode power saving function normal mode normal mode downloaded from: http:/// 10/16 datasheet datasheet BH67172NUX tsz02201-0h1h0b100300-1-2 ? 2012 rohm co., ltd. all rights reserved. 31.jul.2012 rev.002 www.rohm.co tsz22111 ? 15 ? 001 < diagram of relationship between tosc terminal and synchronized time > synchronized time = 8000 x tosc period charge current 100ua discharge current 100ua ex. c tosc = 2200pf tosc frequency = 40khz(typ). tosc period = 25usec. synchronized time = 200msec. equation i v c x tosc tsoc tosc 2 = ctosc : tosc terminal capacitor value vtosc : tosc terminal hi voltage C lo voltage= 0.57v (typ.) i : tosc terminal charge and discharge current fig.17 timing chart setting of electrify angle and output duty while start-up *disagree with above timing chart external capacitor synchronized time 3300pf 300ms 2200pf 200ms 1000pf 90ms 670pf 60ms number of bemf detection (from start-up) start-up until bemf detection 6 times successively after bemf detection 6 times successively synchronized time 8000 tosc pwm duty pwm = fixed 100% pwm = same as external pwm dut y electrify angle 120 150 tosc oscillator divider (/1000) tosc signal sync signal c tosc v w fg ? ?? (ic ? ? ?_? start ?lg ?lg pwm ? ?? fg high g cf . 0.2s max 0.8s pwm?r,fglow??? v w fg ? ?? (ic ? ? ?_? start ?lg ?lg pwm ? ?? fg high g cf . 0.2s max 0.8s pwm?r,fglow??? pwm u phase voltage v phase voltage w phase voltage start bemf detection driving bemf detection signal ( internal ic ) synchronized time synchronized driving bemf detection driving it is possible that fg outputs low pulse when pwm start fg fixed h until start bemf detection driving downloaded from: http:/// 11/16 datasheet datasheet BH67172NUX tsz02201-0h1h0b100300-1-2 ? 2012 rohm co., ltd. all rights reserved. 31.jul.2012 rev.002 www.rohm.co tsz22111 ? 15 ? 001 thermal derating curve permissible dissipation (total loss) indicates the power that can be consumed by ic at ta = 25oc (normal temperature). ic is heated when it consumes power, and the temperature of ic chip becomes higher than ambient temperature. the temperature that can be accepted by ic chip depends on circuit configuration, manufacturing process, etc, and consumable power is limited. permissible dissipation is dete rmined by the temperature allowed in ic chip (maximum junction temperature) and thermal resistance of package (heat dissipation capability). the maximum junction temperature is in general equal to the maximum value in the storage temperature range. heat generated by consumed power of ic is radiated from the mold resin or lead frame of package. the parameter which indicates this heat dissipation capability (hardness of heat release) is called heat resistanc e, represented by the symbol ja [c/w]. the temperature of ic inside the package can be estimated by this heat resistance. below figure shows the model of heat resistance of the package. heat resistance ja, ambient temperature ta, junction temperature tj , and power consumption p can be calculated by the equation below: ja = (tj ta) / p [ /w] thermal derating curve indicates power that can be consumed by ic with reference to ambient temperature. power that can be consumed by ic begins to attenuate at certain am bient temperature. this gradient is determined by thermal resistance ja. thermal resistance ja depends on chip size, power consumption, package ambient temperature, packaging condition, wind velocity, etc even when the same package is used. thermal derating curve indicates a reference value measured at a specified condition. below figure shows a thermal derati ng curve. (value when mounting fr4 glass epoxy board 74.2 [mm] x 74.2 [mm] x 1. 6 [mm] (copper foil area below 3 [%])) above ta = 25oc, derating by 4.64 mw/oc (when glass epoxy board (single layer) of 74.2 mm x 74.2 mm x 1.6 mm is mounted) above ta=25 , derating by 12 mw/ (when glass epoxy board (double layer) of 20. 0mmx20.0mmx1.2mm is mounted.top layer area 65mm2 ,bottom area 8mm2 ) fig.19 thermal derating curve a ja = (tj-ta) / p [ /w] fig.18 thermal resistance ambient temperature ta [oc] chip surface temp erature tj [oc]] power consumption p[w] downloaded from: http:/// 12/16 datasheet datasheet BH67172NUX tsz02201-0h1h0b100300-1-2 ? 2012 rohm co., ltd. all rights reserved. 31.jul.2012 rev.002 www.rohm.co tsz22111 ? 15 ? 001 equivalent circiut vcc 3k gnd vcc 1k 1k vcc 30k vcc 13k 1k 1k 1k vcc gnd u v w gnd gnd 30k 30k 30k 12k 12k 12k 3k 50k 0.17 50k 50k 20 250k 10k vcc downloaded from: http:/// 13/16 datasheet datasheet BH67172NUX tsz02201-0h1h0b100300-1-2 ? 2012 rohm co., ltd. all rights reserved. 31.jul.2012 rev.002 www.rohm.co tsz22111 ? 15 ? 001 safety measure 1) reverse connection protection diode reverse connection of power results in ic destruction as shown in fig.20. when reverse connection is possible, reverse connection destruction preventive diode must be added between power supply and vcc. fig.20 flow of current when power is connected reversely 2) measure against vcc voltage rise by back electromotive force back electromotive force (back emf) generates regenerat ive current to power supply. however, when reverse connection protection diode is connected, vcc voltage rises bec ause no route is available for regenerating to power. fig.21 vcc voltage rise by back electromotive force when the absolute maximum rated voltage may be exceeded du e to voltage rise by back electromotive force, place (a) capacitor or (b) zener diode between vcc and gnd. in addition, also take the measure (a) and (b) as shown in (c) if required. fig.22 measure against vcc voltage rise vcc gnd vcc gnd vcc gnd internal circuit impedance high ? amperage small circuit block each pin in normal ener g ization large current flows ? thermal destruction each pin circuit block reverse power connection no destruction each pin circuit block after reverse connection destruction prevention phase switching on on on on (a) capacitor (b) zener diode (c) capacitor and zener diode on on on on on on downloaded from: http:/// 14/16 datasheet datasheet BH67172NUX tsz02201-0h1h0b100300-1-2 ? 2012 rohm co., ltd. all rights reserved. 31.jul.2012 rev.002 www.rohm.co tsz22111 ? 15 ? 001 3) problem of gnd line pwm switching do not perform pwm switching of gnd line because the po tential of gnd terminal can not be kept at the minimum. fig.23 gnd line pwm switching prohibited 4) fg output fg output is an open drain and requires pull-up resistor. the ic can be protected by adding resistor r1. an exce ss of absolute maximum rating, when fg output terminal is directly connected to power supply, could damage the ic. fig.24 protection of fg terminal pwm input prohibited vcc moto r driver gnd controller m fg protection resistor r1 pull-up resistor vcc connector of board downloaded from: http:/// 15/16 datasheet datasheet BH67172NUX tsz02201-0h1h0b100300-1-2 ? 2012 rohm co., ltd. all rights reserved. 31.jul.2012 rev.002 www.rohm.co tsz22111 ? 15 ? 001 operational notes 1) absolute maximum ratings a n excess in the absolute maximum rations, such as supply voltage, temperature range of operating conditions, etc., can break down the devices, thus making impossible to i dentify breaking mode, such as a short circuit or an open circuit. if any over rated values will expect to exceed the absolute maximum 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 line back electromotive force causes regenerated current to power supply line, therefore take a measure such as placing a capacitor between power supply and gnd for routing regener ated current. and fully ensure that the capacitor characteristics have no problem before determine a capa citor value. (when applying electrolytic capacitors, capacitance characteristic values are reduced at low temperatures) 4) gnd potential the potential of gnd pin must be minimum potential in all operating conditions. al so ensure that all terminals except gnd terminal do not fall below gnd voltage including transient characteristics. however, it is possible that the motor output terminal may deflect below gnd because of influence by back electromotive force of motor. malfunction may possibly occur depending on use condition, environment, and property of individual motor. please make fully confirmation that no problem is found on operation of ic. 5) thermal design use a thermal design that allows for a sufficient margin in light of the power dissipati on (pd) in actual operating conditions. 6) inter-pin shorts and mounting errors use caution when positioning the ic fo r mounting on printed circuit boards. the ic may be damaged if there is any connection error or if pi ns are shorted together. 7) actions in strong electromagnetic field use caution when using the ic in the pr esence of a strong electrom agnetic field as doing so may cause the ic to malfunction. 8) aso when using the ic, set the output transistor so that it does not exceed absolute maximum rations or aso. 9) thermal shut down circuit the ic incorporates a built-in thermal shutdown ci rcuit (tsd circuit). operation temperature is 150 (typ.) and has a hysteresis width of 15 (typ.). when ic chip temperature rises and tsd circuit works, the output terminal becomes an open state. tsd circuit is designed only to shut the ic off to prevent thermal runaway. it is not designed to protect the ic or guarantee its operation. do not continue to use the ic after operation this circuit or use the ic in an environment where the operation of this circuit is assumed. 10) testing on application boards when testing the ic on an application board, connecting a ca pacitor to a pin with low impedance subjects the ic to stress. always discharge capacitors after each process or step. always turn the ics power supply off before connecting it to or removing it from a jig or fixture during the inspection proc ess. ground the ic during assembly steps as an antistatic measure. use similar prec aution when transporting or storing the ic. 11) gnd wiring pattern when using both small signal and large current gnd patterns, it is recommended to isolate the two ground patterns, placing a single ground point at the grou nd potential of application 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 of any external components, either. 12) ic terminal input when vcc voltage is not applied to ic, do not apply voltage to each input terminal. when voltage above vcc or below gnd is applied to the input terminal, parasitic element is actuated due to the stru cture of ic. operation of parasitic element causes mutual interference between circuits, resulting in malfunction as well as destruction in the last. do not use in a manner where parasitic element is actuated. 13) fr function swiching h/l of fr terminal should not be done during the moto r rotation. it should be done from once the motor stop. fr terminal should be connected to vcc or gnd for reducing pwm noise. s tatus of this document the japanese version of this document is formal specification. a customer may use this translation version only for a reference to help reading the formal version. if there are any differences in translation version of this document formal version takes priority downloaded from: http:/// 16/16 datasheet datasheet BH67172NUX tsz02201-0h1h0b100300-1-2 ? 2012 rohm co., ltd. all rights reserved. 31.jul.2012 rev.002 www.rohm.co tsz22111 ? 15 ? 001 ordering information physical dimension tape and reel information marking diagram ? order quantity needs to be multiple of the minimum quantity. datasheet d a t a s h e e t notice - ge rev.002 ? 2014 rohm co., ltd. all rights reserved. notice precaution on using rohm products 1. our products are designed and manufac tured for application in ordinary elec tronic equipments (such as av equipment, oa equipment, telecommunication equipment, home electroni c appliances, amusement equipment, etc.). if you intend to use our products in devices requiring ex tremely high reliability (such as medical equipment (note 1) , transport equipment, traffic equipment, aircraft/spacecra ft, nuclear power controllers, fuel c ontrollers, car equipment including car accessories, safety devices, etc.) and whose malfunction or failure may cause loss of human life, bodily injury or serious damage to property (specific applications), please consult with the rohm sale s representative in advance. unless otherwise agreed in writing by rohm in advance, rohm shall not be in any way responsible or liable for any damages, expenses or losses incurred by you or third parties arising from the use of any ro hms products for specific applications. (note1) medical equipment classification of the specific applications japan usa eu china class class class b class class class 2. rohm designs and manufactures its products subject to strict quality control system. however, semiconductor products can fail or malfunction at a certain rate. please be sure to implement, at your own responsibilities, adequate safety measures including but not limited to fail-safe desi gn against the physical injury, damage to any property, which a failure or malfunction of our products may cause. the following are examples of safety measures: [a] installation of protection circuits or other protective devices to improve system safety [b] installation of redundant circuits to reduce the impact of single or multiple circuit failure 3. our products are designed and manufactured for use under standard conditions and not under any special or extraordinary environments or conditio ns, as exemplified below. accordin gly, rohm shall not be in any way responsible or liable for any damages, expenses or losses arising from the use of an y rohms products under any special or extraordinary environments or conditions. if you intend to use our products under any special or extraordinary environments or conditions (as exemplified below), your independent verification and confirmation of product performance, reliability, etc, prior to use, must be necessary: [a] use of our products in any types of liquid, incl uding water, oils, chemicals, and organic solvents [b] use of our products outdoors or in places where the products are exposed to direct sunlight or dust [c] use of our products in places where the products ar e exposed to sea wind or corrosive gases, including cl 2 , h 2 s, nh 3 , so 2 , and no 2 [d] use of our products in places where the products are exposed to static electricity or electromagnetic waves [e] use of our products in proximity to heat-producing components, plastic cords, or other flammable items [f] sealing or coating our products with resin or other coating materials [g] use of our products without cleaning residue of flux (ev en if you use no-clean type fluxes, cleaning residue of flux is recommended); or washing our products by using water or water-soluble cleaning agents for cleaning residue after soldering [h] use of the products in places subject to dew condensation 4. the products are not subjec t to radiation-proof design. 5. please verify and confirm characteristics of the final or mounted products in using the products. 6. in particular, if a transient load (a large amount of load applied in a short per iod of time, such as pulse. is applied, confirmation of performance characteristics after on-boar d mounting is strongly recomm ended. avoid applying power exceeding normal rated power; exceeding the power rating under steady-state loading c ondition may negatively affect product performance and reliability. 7. de-rate power dissipation (pd) depending on ambient temper ature (ta). when used in seal ed area, confirm the actual ambient temperature. 8. confirm that operation temperat ure is within the specified range described in the product specification. 9. rohm shall not be in any way responsible or liable for fa ilure induced under deviant condi tion from what is defined in this document. precaution for mounting / circuit board design 1. when a highly active halogenous (chlori ne, bromine, etc.) flux is used, the resi due of flux may negatively affect product performance and reliability. 2. in principle, the reflow soldering method must be used; if flow soldering met hod is preferred, please consult with the rohm representative in advance. for details, please refer to rohm mounting specification downloaded from: http:/// datasheet d a t a s h e e t notice - ge rev.002 ? 2014 rohm co., ltd. all rights reserved. precautions regarding application examples and external circuits 1. if change is made to the constant of an external circuit, pl ease allow a sufficient margin considering variations of the characteristics of the products and external components, including transient characteri stics, as well as static characteristics. 2. you agree that application notes, re ference designs, and associated data and in formation contained in this document are presented only as guidance for products use. theref ore, in case you use such information, you are solely responsible for it and you must exercise your own independent verification and judgment in the use of such information contained in this document. rohm shall not be in any way responsible or liable for any damages, expenses or losses incurred by you or third parties arising from the use of such information. precaution for electrostatic this product is electrostatic sensitive product, which may be damaged due to electrostatic discharge. please take proper caution in your manufacturing process and storage so that voltage exceeding t he products maximum rating will not be applied to products. please take special care under dry condit ion (e.g. grounding of human body / equipment / solder iron, isolation from charged objects, se tting of ionizer, friction prevention and temperature / humidity control). precaution for storage / transportation 1. product performance and soldered connections may deteriora te if the products are stor ed in the places where: [a] the products are exposed to sea winds or corros ive gases, including cl2, h2s, nh3, so2, and no2 [b] the temperature or humidity exceeds those recommended by rohm [c] the products are exposed to di rect sunshine or condensation [d] the products are exposed to high electrostatic 2. even under rohm recommended storage c ondition, solderability of products out of recommended storage time period may be degraded. it is strongly recommended to confirm sol derability before using products of which storage time is exceeding the recommended storage time period. 3. store / transport cartons in the co rrect direction, which is indicated on a carton with a symbol. otherwise bent leads may occur due to excessive stress applied when dropping of a carton. 4. use products within the specified time after opening a humidity barrier bag. baking is required before using products of which storage time is exceeding the recommended storage time period. precaution for product label qr code printed on rohm products label is for rohms internal use only. precaution for disposition when disposing products please dispose them proper ly using an authorized industry waste company. precaution for foreign exchange and foreign trade act since our products might fall under cont rolled goods prescribed by the applicable foreign exchange and foreign trade act, please consult with rohm representative in case of export. precaution regarding intellectual property rights 1. all information and data including but not limited to application example contained in this document is for reference only. rohm does not warrant that foregoi ng information or data will not infringe any intellectual property rights or any other rights of any third party regarding such information or data. rohm shall not be in any way responsible or liable for infringement of any intellectual property rights or ot her damages arising from use of such information or data.: 2. no license, expressly or implied, is granted hereby under any intellectual property rights or other rights of rohm or any third parties with respect to the information contained in this document. other precaution 1. this document may not be reprinted or reproduced, in whol e or in part, without prior written consent of rohm. 2. the products may not be disassembled, converted, modified, reproduced or otherwise changed without prior written consent of rohm. 3. in no event shall you use in any wa y whatsoever the products and the related technical information contained in the products or this document for any military purposes, incl uding but not limited to, the development of mass-destruction weapons. 4. the proper names of companies or products described in this document are trademarks or registered trademarks of rohm, its affiliated companies or third parties. downloaded from: http:/// datasheet datasheet notice C we rev.001 ? 2014 rohm co., ltd. all rights reserved. general precaution 1. before you use our pro ducts, you are requested to care fully read this document and fully understand its contents. rohm shall n ot be in an y way responsible or liabl e for fa ilure, malfunction or acci dent arising from the use of a ny rohms products against warning, caution or note contained in this document. 2. all information contained in this docume nt is current as of the issuing date and subj ec t to change without any prior notice. before purchasing or using rohms products, please confirm the la test information with a rohm sale s representative. 3. the information contained in this doc ument is provi ded on an as is basis and rohm does not warrant that all information contained in this document is accurate an d/or error-free. rohm shall not be in an y way responsible or liable for an y damages, expenses or losses incurred b y you or third parties resulting from inaccur acy or errors of or concerning such information. downloaded from: http:/// |
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