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1 / 15 www.rohm.com 2009.05 - rev.a ? 2009 rohm co., ltd. all rights reserved. system power supply for tv series fet controller type 3ch system power supply ics bd8601fv description bd8601fv has realized the high performance and reliability required as a power supply for thin-screen tv. due to the high-speed load response, it is most suitable for tv-purpose processors with in creasingly high performance, and due to the wide phase margin it leaves a good margin for board pattern & constant setting and so facilitates its application design. as a high-reliability design, it has various built-in protec tion circuits (overcurrent protection, output voltage abnormal protection, thermal protection, and off-latc h function at the time of abnormality etc. ), therefore as an ad vantage it does not easily damage in every possible abnormal condition such as a ll-pin short circuit test etc. and hence most suitable for thin-screen tv which requires the high reliability. features 1) 3ch synchronous rectif ication step-down system dc/dc converter controller 2) 3ch independent on/off. controllable 3) soft start, soft off function 4) concentrated protection c ontrol with built-in sequencer 5) built-in low voltage protection function 6) built-in overvoltage protection function 7) built-in overcurrent protection function 8) built-in rt terminal open/short protection function 9) built-in duty clamp (90% on) function 10) frequency setting by external resistance is available. 11) protection condition is output from pdet terminal. 12) built-in external reset output function no.09034eat01
technical note 2 / 15 bd8601fv www.rohm.com 2009.05 - rev.a ? 2009 rohm co., ltd. all rights reserved. (ta=25 , vin1, vin2, vin3=5.0v, vcc=5.0v, and gnd=0v unless other wise specified.) parameter symbol specification value unit condition min typ max circuit current 1 i q1 - 3.5 8 ma ctl1,2,3=0v circuit current 2 i q2 - 7 15 ma ctl1,2,3=vcc < error amplifier part ch1,ch2,ch3> standard voltage vref) v re f 0.792 0.8 0.808 v terminal fb and fc terminal short terminal fb input bias current i fbb -1 - 1 a v fb =0.9v terminal fc clamping voltage h v fch 1.8 - - v v fb =0.7v terminal fc clamping voltage l v fcl - - 0.2 v v fb =0.9v terminal fc sink current i fcsink 0.5 - - ma v fb =0.9v, v f c =0.4v terminal fc source current i fcsource - - -70 a v fb =0.7v, v f c =1.6v open loop gain a ver r - 100 - db oscillation frequency f os c 100 - 600 khz < duty clamping part ch1,ch2,ch3> max on duty ratio f ondut y 70 85 95 % v fb =0.7v < soft start part ch1,ch2,ch3> charging current i ss -4.0 -2.5 -1.0 a v ss =1.0v terminal ss threshold voltage v ssth 1.0 1.1 1.2 v v ss voltage, v f c =0.8v terminal ss clamping voltage v ssclm 1.6 1.9 2.2 v terminal ss standby voltage v ssstb 0.11 0.15 0.19 v v ss voltage (l h) terminal ss standby voltage maximum hysteresis error v ssstb_hys 5 50 100 mv terminal ss discharge resistance r s s 49 70 91 k ? terminal ss protection circuit start voltage v sspon 1.0 1.1 1.2 v v ss voltage (l h) terminal ss protection circuit start voltage maximum hysteresis error v sspon_hys 10 100 200 mv v ss voltage < low voltage, over voltage detection part ch1,ch2,ch3> terminal fb low voltage detection voltage v lv p 0.27 0.32 0.37 v v fb voltage terminal fb low voltage detection maximum hysteresis error v lvp_hys 10 100 200 mv v fb voltage terminal fb overvoltage detection voltage v ov p 1.08 1.2 1.32 v v fb voltage < over current detection part ch1,ch2,ch3> terminal lx input bias current i lxb -1 0 1 ua terminal ocp input bias current i ocpb 20 50 80 ua < reset detection part > terminal monvcc reset detection voltage v rst o 0.98 1.0 1.02 v v monvc c voltage (h l) terminal monvcc input bias current i monvccb -1 - 1 ua terminal rstdly charging current i rstdl y -15 -10 -5 ua terminal reset l output voltage v ol rst - - 0.4 v i ol =100ua < others> terminal pdet l output voltage v ol rdet - - 0.4 v i ol =100ua terminal ctl input voltage h level voltage v ih ctl 2.0 - vcc v terminal ctl1,2,3 terminal ctl input voltage l level voltage v il ctl - - 0.5 v terminal ctl1,2,3 terminal ctl input current i ictl - 85 120 ua terminal ctl1,2,3, ctl=vcc terminal drv h output voltage v oh drv 8.5 - - v terminal drv1a,2a,3a,1b,2b,3b terminal drv l output voltage v ol drv - - 0.5 v terminal drv1a,2a,3a,1b,2b,3b v fb : fb terminal voltage, v fc : fc terminal voltage, v ss : ss terminal voltage, v monvcc : monvcc terminal voltage not designed for radiation resistance. current capability should not exceed pd.
technical note 3 / 15 bd8601fv www.rohm.com 2009.05 - rev.a ? 2009 rohm co., ltd. all rights reserved. 1 2 3 4 5 6 7 8 9 10 121314151617181920 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 11 ovp1.5 lvp0.4 pdet monvcc rstdly reset vcc ctl3 ctl2 ctl1 test2 test1 gnd ss3 fc3 fb3 vin3 drv3a drv3b lx3 pgnd3 pgnd1 drv1b lx1 drv1a vin1 fb1 fc1 ss1 gnd rt fc2 fb2 vin2 drv2a lx2 drv2b pgnd2 driver control ovp1.5 lvp0.4 driver control ovp1.5 lvp0.4 driver control ss2 delay system control sequencer vrsto vref vref vref osc ss1 ss2 ss3 ocp3 ocp2 ocp1 figure 1 block char terminal explanation table 1 terminal explanation no. s y mbol descri p tion no. s y mbol descri p tion 1 pgnd1 ch1 power gnd ( same p otential as gnd terminal ) 40 pdet off latch signal output 2 drv1b ch1 nch drive out p ut terminal 39 monvcc vcc monitor terminal 3 lx1 ch1 overcurrent detection terminal 38 rstdly reset delay adjustment capacity connection terminal 4 d r v1 a ch1 pch drive out p ut terminal 37 rese t reset out p ut terminal 5 vin1 ch1 p ower su pp l y in p ut terminal 36 vcc power su pp l y in p ut terminal 6 ocp1 ch1 overcurrent detection level resistance connection terminal 35 ctl3 ch3 control terminal 7 fb1 ch1 vol t a g e detection terminal 34 ctl2 ch2 control terminal 8 fc1 ch1 p hase com p ensation terminal 33 ctl1 ch1 control terminal 9 ss1 ch1 soft start adjustment capacity connection terminal 32 test2 test terminal (connect to gnd) 10 gnd gnd ( 0v connection ) 31 test1 test terminal ( connec t to gnd ) 11 rt frequency adjustment resistance connection terminal 30 gnd gnd (0v connection) 12 ss2 ch2 soft start adjustment capacity connection terminal 29 ss3 ch3 soft start adjustment capacity connection terminal 13 fc2 ch2 p hase com p ensation terminal 28 fc3 ch3 p hase com p ensation terminal 14 fb2 ch2 volta g e detection terminal 27 fb3 ch3 volta g e detection terminal 15 ocp2 ch2 overcurrent detection level resistance connection terminal 26 ocp3 ch3 overcurrent detection level resistance connection terminal 16 vin2 ch2 p ower su pp l y in p ut terminal 25 vin3 ch3 p ower su pp l y in p ut terminal 17 drv2 a ch2 pch drive out p ut terminal 24 drv3 a ch3 pch drive out p ut terminal 18 lx2 ch2 overcurrent detection termin al 23 lx3 ch3 overcurrent detection terminal 19 drv2b ch2 nch drive out p ut terminal 22 drv3b ch3 nch drive out p ut terminal 20 pgnd2 ch2 power gnd ( same p otential as terminal gnd ) 21 pgnd3 ch3 power gnd ( same p otential as terminal gnd )
technical note 4 / 15 bd8601fv www.rohm.com 2009.05 - rev.a ? 2009 rohm co., ltd. all rights reserved. terminal equivalent circuit chart terminal no. terminal name explanation terminal equivalent circuit chart 1 pgnd1 ch1 power gnd (gnd terminal and this potential) 20 pgnd2 ch2 power gnd (gnd terminal and this potential) 21 pgnd3 ch3 power gnd (gnd terminal and this potential) 2 drv1b ch1 nch driving output terminal 19 drv2b ch2 nch driving output terminal 22 drv3b ch3 nch driving output terminal 3 lx1 ch1 over current detection terminal 18 lx2 ch2 over current detection terminal 23 lx3 ch3 over current detection terminal 4 drv1a ch1 pch driving output terminal 17 drv2a ch2 pch driving output terminal 24 drv3a ch3 pch driving output terminal 5 vin1 ch1 power supply input terminal 16 vin2 ch2 power supply input terminal 25 vin3 ch3 power supply input terminal vin vin pgnd pgnd ? 22 vin pgnd ? 23 vin vin vin1 vin1 pgnd pgnd ? 24
technical note 5 / 15 bd8601fv www.rohm.com 2009.05 - rev.a ? 2009 rohm co., ltd. all rights reserved. terminal no. terminal name explanation terminal equivalent circuit chart 6 ocp1 ch1 over current detection level set resistance connection terminal 15 ocp2 ch2 over current detection level set resistance connection terminal 26 ocp3 ch3 over current detection level set resistance connection terminal 7 fb1 ch1 voltage detection terminal 14 fb2 ch2 voltage detection terminal 27 fb3 ch3 voltage detection terminal 8 fc1 ch1 phase amends terminal 13 fc2 ch2 phase amends terminal 28 fc3 ch3 phase amends terminal vcc gnd ? 26 vin1 vcc gnd ? 27 vcc gnd ? 28
technical note 6 / 15 bd8601fv www.rohm.com 2009.05 - rev.a ? 2009 rohm co., ltd. all rights reserved. terminal no.. terminal name explanation terminal equivalent circuit chart 9 ss1 ch1 soft start adjustment capacity connection terminal 12 ss2 ch2 soft start adjustment capacity connection terminal 29 ss3 ch3 soft start adjustment capacity connection terminal 10 gnd gnd 0v connection) 30 gnd gnd 0v connection) 11 rt frequency adjustment resistance connection terminal 31 test1 test terminal 32 test2 test terminal 33 ctl1 ch1 control terminal 34 ctl2 ch2 control terminal 35 ctl3 ch3 control terminal ? 29 vcc gnd ? vcc gnd vcc gnd 31 32 33 34 35
technical note 7 / 15 bd8601fv www.rohm.com 2009.05 - rev.a ? 2009 rohm co., ltd. all rights reserved. terminal no. terminal name explanation terminal equivalent circuit chart 36 vcc power supply input terminal 37 reset reset output terminal 38 rstdly reset delay adjustment capacity connection terminal 39 monvcc vcc monitor terminal 40 pdet off latch output terminal vcc gnd 37 vcc gnd 38 vcc gnd 39 vcc gnd 40
technical note 8 / 15 bd8601fv www.rohm.com 2009.05 - rev.a ? 2009 rohm co., ltd. all rights reserved. on/off control dc/dc converter controller on/off function dc/dc converter controller of each ch can be independently controlled on/off by ctl1, ctl2, and ctl3 terminal. analog circuit of ch interlocked to each ctl terminal starts operation at on control (on mode), and goes down to setting output voltage. analog circuit of ch interlocked to each ctl terminal should be standby at off control (off mode), and output voltage becomes 0v. table2 dc/dc converter controller on/off function ctl1 terminal voltage ch1 ctl2 terminal voltage ch2 ctl3 terminal voltage ch3 >vihctl1 on control >vihctl2 on control >vihctl3 on control technical note 9 / 15 bd8601fv www.rohm.com 2009.05 - rev.a ? 2009 rohm co., ltd. all rights reserved. osc oscillation frequency setting function drva and drvb output oscillation frequency of dc/dc converter controller of each ch can be set by installing resistance between rt terminal and gnd externally. figure 3 terminal rt resistance-oscillation frequency off latch signal output function pdet terminal outputs condition of off latch when protection operation of dc/dc converter controller of each ch operates. table 3 pdet terminal off latch signal output function protection operation terminal pdet on low off hi-z 1 0 10 0 100 0 1000 0 11 0 10 0 100 0 switching frequency[khz] *reference data rt terminal resistance[k ]
technical note 10 / 15 bd8601fv www.rohm.com 2009.05 - rev.a ? 2009 rohm co., ltd. all rights reserved. reset output function reset output function observes voltage value from monvcc terminal and does reset operation compared to internal reference level. set monvcc terminal external resistance to make vcc voltage more than 5.0v at reset release. table 4 dc/dc converter controller on/off function monvcc terminal voltage reset terminal <1.0v(typ) low > 1.072 v(typ) hi-z delay time until detecting reset release is settable by capacitor connected to rstdly terminal. rstdly rstdly rstdly i c1.235v t ? ? 0 hi z low reset t rstdly ? v rsto ( = ) r 1 +r 2 r 2 (v rsto +v rsto_hys ) vcc vcc monvcc r 1 r 2 v rsto (1.0v) reset c rstdly power supply in reset input side 1.235v i rstdly t rstdly : delay time until de tecting reset release figure 4 reset operation
technical note 11 / 15 bd8601fv www.rohm.com 2009.05 - rev.a ? 2009 rohm co., ltd. all rights reserved. protection circuit is effective for destruction prevention due to accident so that avoid using by continuous protection operation. low voltage protection function(lvp) low voltage protection function detects output voltage v o set in each ch from fb terminal of each ch and off-latched all dc/dc converter controller compared to internal reference level. low voltage protection function operates when fb terminal voltage falls below v lvp (=1.5 x vref) and continues about more than 400 sec (typ). table 5 low voltage protection function ctl terminal ss terminal fb terminal low voltage protection function low voltage protection operation >v ihctl >1.1v(typ) v lvp +v lvp_hys off <1.0v(typ) - disable off v ihctl >1.1v(typ) >v ovp effective on technical note 12 / 15 bd8601fv www.rohm.com 2009.05 - rev.a ? 2009 rohm co., ltd. all rights reserved. overcurrent protection function(ocp) overcurrent protection function compared drain voltage (lx te rminal voltage) with ocp terminal voltage when external pch power mos is on. when lx terminal voltage becomes lower than ocp terminal voltage, external mos would be off. up to 50ua (typ) of constant current from ocp terminal is synchronized. overcurrent detection level (ocp terminal voltage) can be set arbitrarily by external resistance value. off latch by overcurrent protection function operates when lx terminal voltage falls below ocp terminal voltage and continues about more than 400 sec (typ). table 7 overcurrent protection function ctl terminal ss terminal lx terminal voltage overcurrent protection function overcurrent protection operation >v ihctl >1.1v(typ) v ocp off <1.0v(typ) - disable off technical note 13 / 15 bd8601fv www.rohm.com 2009.05 - rev.a ? 2009 rohm co., ltd. all rights reserved. terminal fc abnormality protection function about 400usec(typ) continuance and an off latch. off latch fclp=0.62v(typ) 1.5v(typ) fc internal triangular wave 0.9v(typ) fchp=1.95v(typ) about 400usec(typ) the terminal fc abnormality protection function ofrattis it al l dc/dc converter controller detecting the continuance of the state that fc which is the difference input of pwmcomp does not intersect with an internal triangular wave. the terminal fc abnormality protection function is exceeded 1.95v(typ) by the voltage of the terminal fc or operates when it falls below 0.62v(typ), and about 400usec(typ) or more continues. ctl terminal ss terminal protection operation fc terminal te r m i n a l f c abnormality protection operation > v ihctl > 1.1v(typ) enable > 1.95v(typ) on 0.62v(typ) < , < 1.95v(typ) off < 1.0v(typ) disable < 0.62v(typ) on < v ihctl - off * terminal fc abnormality protection function is enabled when ss te rminal voltage of each ch becomes more than 1.1v (typ) in the transition to on control (during soft start). rt terminal open/short protection function rt terminal open/shot protection function off-latc hes all dc/dc converter controller by detecting open/short condition internally from rt terminal to prevent from output voltage error caused by abnormal oscillation of internal triangular wave at rt terminal open/short. rt terminal open/short protection function is regularly enabled after boot-up. rt terminal open/short protection function operates when error detection condition continues about more than 400 sec (typ).
technical note 14 / 15 bd8601fv www.rohm.com 2009.05 - rev.a ? 2009 rohm co., ltd. all rights reserved. soft start time-out function each ch dc/dc converter controller off-latch-controls when v ss does not exceed v sspon from v ss > v ssstb +v ssstb_hys after 50msec (typ) passed from soft start. figure 6. at soft start time-out error detection (off latch) release method each ch dc/dc converter controller comes into off latch condition when protection function operates. off latch can be released by the following method. each ch dc/dc converter controller becomes able to do on control transition by releasing off latch. 1. set all ch ctl terminal voltage as < v ilctl and continue that condition about more than 200usec (typ). 2. drop down power supply vcc to below 4.5v.
technical note 15 / 15 www.rohm.com 2009.05 - rev.a ? 2009 rohm co., ltd. all rights reserved. bd8601fv b d 8 6 0 1 f p - e 2 part no. part no. package fp: ssop-b40 packaging and forming specification e2: embossed ta p e and reel *when you order , please order in times the amount of package quantity. reel 1pin 1234 1234 1234 direction of feed 1234 1234 1234 1234 1234 unit:mm ) ssop-b40 0.22 0.1 0.65 0.15 0.1 0.3min. 7.8 0.3 5.4 0.2 1.8 0.1 0.1 1 40 20 21 13.6 0.2 0.1 0.08 m ta p e quantit y direction of feed embossed carrier ta p e 2000 p cs e2 (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)
r0039 a www.rohm.com ? 2009 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 specied herein is subject to change for improvement without notice. the content specied 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 specications, 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 specied 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 specied herein is intended only to show the typical functions of and examples of application circuits for the products. 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 specied in this document are intended to be used with general-use electronic equipment or devices (such as audio visual equipment, ofce-automation equipment, commu- nication devices, electronic appliances and amusement devices). the products specied 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, re or any other damage caused in the event of the failure of any product, such as derating, redundancy, re 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 specied 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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