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| 1/11 www.rohm.com 2009.07 - rev.a ? 2009 rohm co., ltd. all rights reserved. led driver series for lighting step-down type with 1.5a output BD9207FPS description BD9207FPS is a led driver with built-in step-down switching regulator and incorporates the built-in switching mos eft of pch. feedback voltage is as low as 0.2v and can s uppress the loss on the sense resistance of led. it is operated by pwm method with an oscillating frequency of 900 khz and can use smaller coil than a switching regulator of low-frequency operation. features 1) maximum switching current of 1.5a 2) built-in pch switching mos fet for high efficiency 3) low loss because feedback voltage is as low as 0.2v 4) high oscillating frequency of 900khz (fixed) 5) built-in soft start function 6) built-in overcurrent protection circuit (ocp) 7) built-in thermal shutdown circuit (tsd) 8) on/off of output is possible by stby terminal. 9) compact surface-mount to252s-5 package applications ? for use in the light sources of ppc ? printer etc. and the lcd backlights of led lighting apparatus & monitor ? note pc etc. absolute maximum ratings ta=25 parameter symbol rating unit supply voltage vcc-gnd vcc 36 v stby-gnd voltage v stby 36 v out-gnd voltage v out 36 v inv-gnd voltage v inv 5 v maximum switching output current. iout 1.5(*1) a allowable loss pd 800(*2) mw operating temperature range topr -20 ~ +85 storage temperature range tstg -55 ~ +150 (*1)regardless of the list ed rating, do not exceeded pd, aso or tjmax=150 . (*2) without heat sink, reducing by the 16 mw every 1 rise in temperature. (above 25 ) no.09093eat01 downloaded from: http:///
technical note 2/11 BD9207FPS www.rohm.com 2009.07 - rev.a ? 2009 rohm co., ltd. all rights reserved. operating range (ta=-40 +85 ) parameter symbol limit unit conditions min. typ. max. supply voltage v cc 8.0 - 35.0 v output voltage vo 2.5 - 0.8 (vcc-ioron) v electrical characteristics unless otherwise specified, ta=25 ,vcc=24v,stby=3v parameter symbol limit unit conditions min. typ. max. output mos on resistance ron - 1.0 1.5 ? oscillating frequency fosc 810 900 990 khz overcurrent detection current iocp 1.6 - - a inv terminal threshold voltage vinv 0.194 0.200 0.206 v inv terminal bypass current iinv - 1 2 a vinv=0.2v stby terminal control voltage on vstbyon 2.0 - 36 v off vstbyoff -0.3 - 0.3 v stby terminal inflow current istby 5 15 30 a stby=3v circuit current icc - 5 12 ma standby current ist - 0 5 a stby 0v soft start time tss - - 10 ms stby 0 3v without radiation-proof design. downloaded from: http:/// technical note 3/11 BD9207FPS www.rohm.com 2009.07 - rev.a ? 2009 rohm co., ltd. all rights reserved. block diagram outline drawing of package explanation of terminal used normally in open-circuit condition pin no. pin name function 1 vcc supply voltage terminal 2 out drain terminal of built-in pmos fet 3 out drain terminal of built-in pmos fet fin gnd ground terminal 4 inv output voltage feedback terminal 5 stby on/off control terminal to252s-5 unit mm vref osc 1 2 driver pwm comp ctllogic tsd error amp 4 inv out gnd stby 5 vcc ocp stby fin downloaded from: http:/// technical note 4/11 BD9207FPS www.rohm.com 2009.07 - rev.a ? 2009 rohm co., ltd. all rights reserved. functional explanation of block ? vref the constant voltage to be temperature-compensated is created from the voltage inputted from vcc terminal. ? osc triangular wave with an oscillating frequency of 900 khz is cr eated, as an input of pwm comp arator, by built-in resistor and capacitor. ? error amp it detects, at inc terminal, the voltage of sense resistanc e terminal created by lec current, and compares it to the reference voltage, and amplifies and ou tputs the differential voltage. (the reference voltage is 0.2v3%) ? pwm comp pwm comp converts the output voltage of error amplifier into the pulse-width modulation waveform and outputs it to driver. ? driver push-pull fet driver takes in the pwm waveform and directly drives the pch mos fet that is built-in in the ic. ? stby the on/off control of output is performed by stby terminal . the output becomes on if stby voltage is high level. ? thermal shutdown circuit (tsd) tsd circuit protects the ic from r unaway thermal operation or heat damage. tsd circuit detects the temperatur e of chip, and the circuit becomes off if the temperature reaches 175 . for tsd detection and release, the hysteresis of 15 is set, so the malfunction caused by te mperature variation is prevented. ? over current protection ocp out is turned off if the voltage difference between vcc C out, caused by the current flowin g in the pch mos eft built-in in ocp circuit, is detected and reaches the reference value of oc p. the ocp is not of latch type but of self-return type. ? soft start circuit (ss) soft start time is set by the built-in capacitor connected to ss circuit. the capacitor is charged when stby terminal becomes high level and the ic is started. the soft start time is set at 4ms or so. downloaded from: http:/// technical note 5/11 BD9207FPS www.rohm.com 2009.07 - rev.a ? 2009 rohm co., ltd. all rights reserved. selection and setting of application parts coil l1 the application efficiency will decrease by the larger serial resistance element of coil. moreover, because ocp operates by 1.6a(min) or more, so please notice the heat generated by overload output or short. please set current ratings of coil with i out (max) S il or more. iout max : maximum load current if current flows more than ratings current, then coil generat es heat, magnetic saturation, and causes oscillation or low efficiency. please select the peak current with enough ma rgins not to exceed current rating of coil. l1: coil value,vcc: input vo ltage,vout: output voltage, S il: ripple current, fosc: oscillation frequency when value the efficiency , we recommend c10-h5r(mitsumi) . efficiency will be improved about 1~2%. schottky diode d1 please select schottky diode with lowest forward voltage vf. (we can suppress the dissipation of forward voltage descent, and raise the efficiency. diode selection is based on maximum forward current rating, reverse voltage rating and permissible power dissipation of diode. ? the maximum current ratings are assumed more than th e value of maximum load current+ coil ripple current S i l . ? reverse voltage rating is set to be vin or more. ? please choose the smallest one of reverse current ir. especially, ir grows at high temperature, and causes thermo runaway. ? select the diode which permissible power dissipation within ratings. diode power dissipation pdi is shown below. pdi=iout(max)vf(1-vout/vcc) iout max : load current. vf: forward voltage, vout: output voltage, vcc: input voltage output capacitor c1 select the output capacitor with esr met the following formula. moreover, permissible ripple current effective value of output capacity is calculated by the next formula, and use this value to select the capacitor with enough margins. irms = S il/2 3 irms: permissible ripple current effective value of output capacity, S il : ripple current ceramic capacitor must use the one more than b characteristic. besides above mentioned, ic might not be normally operated according to the different setting condition of ambient temperature and output voltage. moreover, even aluminum electrolytic capacitor can be used, please confirm its operation enough before using it. input capacitor c2 input capacitor built in pch mos fet on is the current supply of coil by fet. so, please close to ic as near as possible to connect it. e nough margins is taken on setting input capacitor in capacitor withstand voltage and permissible ripple current value. accord ing to the ripple current effective value of input capacitor shown below, select the capacitor with enough permissible ripple current value. irms : permissible ripple current value of input capacitor iout : load current. vout: output voltage, vcc: input voltage Sil . = l1 (vcc vout) vout vcc fosc 1 irms iout (1 vout / vcc)vout / vcc esr QS vl/ S il S vl : permissible ripple voltage, S il : ripple current downloaded from: http:/// technical note 6/11 BD9207FPS www.rohm.com 2009.07 - rev.a ? 2009 rohm co., ltd. all rights reserved. resistance r1 led current value is set below according to sense resistance r1. iled[a] vinv[v]/r1[ ? ] 0.2v/r1[ ? ] moreover, dcdc output voltage will be the value below. vo[v] vf led forward voltage vinv[v] vf 0.2v(typ) recommended circuit example and notes of substrate layout ? to prevent noise and low efficiency, please set up the capacitor and schottky diode between vcc C gnd as near as possible to ic. ? please connect the resistance and output lc filter capacito r between inv C gnd with same gnd for the stability of output voltage. technical note 7/11 BD9207FPS www.rohm.com 2009.07 - rev.a ? 2009 rohm co., ltd. all rights reserved. i inv icc vcc cccc out gnd inv stby vcc sw4 sw5 sw2 1 2 fin 45 a vo f a a v v inv istb vstb sw + + io 0.43 measurement circuit diagram downloaded from: http:/// technical note 8/11 BD9207FPS www.rohm.com 2009.07 - rev.a ? 2009 rohm co., ltd. all rights reserved. heat transfer characteristic i/o terminal equivalent circuit diagram 1pin,fin (vcc, gnd) 2pin (out) 4pin (inv) 5pin (stby) power dissipation [pd] ambient temperature [ta] ic unit 2 layers substrate(area of subs trate back copper foil:15 mm15mm) 2 layers substrate(area of subs trate back copper foil:70 mm70mm) 0 2 5 3 0 25 50 75 100 125 150 0.80w 1.85w 1 4 85 3.50w w g y i downloaded from: http:/// technical note 9/11 BD9207FPS www.rohm.com 2009.07 - rev.a ? 2009 rohm co., ltd. all rights reserved. notes for use 1. we have paid enough attention to quality control of this product, but it may be destroyed when the absolute maximum rating of impressed voltage and operating temp erature range is exceeded. because we cant specify that is short-mode or open-m ode etc while it is destroyed, so please discuss to give physical safety action with postulating the special mode exceeded absolute maximum rating. 2. about application circuit application circuit is recommended, but please fully confir m temperature characteristic etc when using it. moreover, please acknowledge that our company cant confirm enough about patent. 3. about the range of oper ation power-supply voltage circuit function operation at the range of operation ambient temperature is guaranteed when it is in the range of operation power-supply voltage. about char acteristic value, the specification va lue of electric characteristic cant be guaranteed, but the characteristic value doesnt change rapidly in these ranges. 4. about ground connection the ground connection shown in application circuit example should equip enough fat gnd fin to every ground connection with shortest pattern drawing, and the patte rn shouldnt interfere the electric characteristic. 5. about input power-supply the input power-supply shown in application circuit exam ple should equip input pin vcc(1pin) with short enough pattern drawing, and the pattern shouldnt interfere the electric characteristic. 6. please think about permissible power dissipation (pd) in an actual using status, and do the heat design with enough margins. 7. please pay enough attention to the dire ction and displacement of ic when you inst all it on pcb. if you install it by mistake, ic might be destroyed, moreover, when short- circuit happen by foreign substance entered between outputs, or output and power suppl y gnd, it will be destroyed. 8. please note that there is a possibility of malfuncti on if you use it in strong electromagnetic field. 9. please set stby terminal voltage to 0.3v or less when putti ng it on standby status, to 2.0v or more when putting it on operation status. please do not fix stby terminal voltage from 0.3v to 2.0v. it may cause malfunction or breakdown. downloaded from: http:/// technical note 10/11 BD9207FPS www.rohm.com 2009.07 - rev.a ? 2009 rohm co., ltd. all rights reserved. 10. this ic is a monolithic ic, and there are p + isol ation and p substrate for element separation between each element. p-n joint is formed with this p layer and n each elements layer, and various parasitic elements are composed. for instance, as shown in the figure below, when re sistance and transistor are connected with terminal: p-n joint operates as a parasitic diode when gnd > (ter minal a) in resistance, gnd >(terminal b) in transistor (npn). moreover, when gnd > (terminal b) in transistor (npn),t he parasitic npn transistor operates with n layer of other elements adjoining with above-mentioned parasitic diode. according to potential relation, parasitic element in ic structure can be consequent. the operating of parasitic element maybe interfere the circuit operation, and become the cause of malfunction an d destruction. therefore, please pay enough att ention not to use it by impr essing lower voltage than gnd (p substrate) on i/o terminal etc to operate parasitic element. simple structure example of bipolar ic substrate terminal resistance terminal transistor terminal parasitic element terminal substrate parasitic element parasitic element parasitic element other adjoining elements downloaded from: http:/// technical note 11/11 BD9207FPS www.rohm.com 2009.07 - rev.a ? 2009 rohm co., ltd. all rights reserved. ordering part number b d 9 2 0 7 f p s - e 2 part no. part no. package fps: to252s-5 packaging and forming specification e2: embossed tape and reel (unit : mm) to252s-5 s 0.08 m 0.08 s +6 4 C4 1 2 3 54 0.8 0.71 c0.5 6.5 0.2 5.1 + 0.2 0.1 5.5 0.2 1.5 0.2 fin 0.27 0.1 1.0 0.2 2.5 0.15 9.5 0.3 1.2 0.1 0.27 0.1 0.6 0.2 0.27 0.1 1.27 0.35 0.1 direction of feed 1pin reel ? 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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