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technical note system power supply for tv series fet controller type 3ch system power supply ics BD8601FV description BD8601FV has realized the high performance and reliabilit y 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 increas ingly 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 protection circuits (overcurrent protection, output voltage abnormal prot ection, thermal protection, and off-latch function at the time of abnormality etc.), therefore as an advantage it does not easily damage in eve ry possible abnormal condition such as all-pin short circuit test etc. and henc e most suitable for thin-screen tv which requires the high r eliability. features 1) 3ch synchronous rectification 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 aug. 2008
2 / 15 electric characteristic (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 -3.58m a ctl1,2,3=0v circuit current 2 i q2 -715m a 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 --0.2vv fb =0.9v terminal fc sink current i fcsink 0.5 - - m a 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- b oscillation frequency f os c 100 - 600 kh z < 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 par t 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 par t ch1,ch2,ch3 terminal lx input bias current i lxb -1 0 1 u a terminal ocp input bias current i ocpb 20 50 80 u a < reset detection par t > 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 monvc c b -1 - 1 u a terminal rstdly charging current i rstdl y -15 -10 -5 u a terminal reset l output voltage v ol rst --0.4vi ol =100ua < others terminal pdet l output voltage v ol rdet --0.4vi 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 --0.5v terminal ctl1,2,3 terminal ctl input current i ictl -85120u a 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.
3 / 15 block diagram 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
4 / 15 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
5 / 15 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
6 / 15 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
7 / 15 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
8 / 15 operation description 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. table1 dc/dc converter controller on/off function ctl1 terminal voltage ch1 ctl2 terminal voltage ch2 ctl3 terminal v oltage ch3 >vihctl1 on control >vihctl2 on control >vihctl3 on control 9 / 15 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. 10 100 1000 10000 1 10 100 1000 rt??[k] ??[kh z *?` 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 2 pdet terminal off latch signal output function protection operation terminal pdet on low off hi-z switching frequency[khz] rt terminal resistance[k] *reference data
10 / 15 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 3 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. r s t d l y i r s t d l y c 1 . 2 3 5 v r s t d l y t ? ? t rstdly delay time until detecting reset release figure 4 reset operation
11 / 15 protection function 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 vref) and continues about more than 400 sec (typ). table 4 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 12 / 15 overcurrent protection function(ocp) overcurrent protection function compared drain voltage (lx terminal voltage) with ocp terminal voltage when external pch power mos is on. when lx terminal voltage becomes lower th an 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 6 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 13 / 15 terminal fc abnormality protection function the terminal fc abnormality protection function ofrattis it all 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 f unction 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 terminal fc 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 term inal 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-latches all dc/dc converte r controller by detecting open/short condition internally from rt terminal to prevent fr om 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).
14 / 15 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 5-3. 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.
15 / 15 catalog no.08t272a '08.8 rohm ? 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)
notes no technical content pages of this document may be reproduced in any form or transmitted by any means without prior permission of rohm co.,ltd. the contents described herein are subject to change without notice. the specifications for the product described in this document are for reference only. upon actual use, therefore, please request that specifications to be separately delivered. application circuit diagrams and circuit constants contained herein are shown as examples of standard use and operation. please pay careful attention to the peripheral conditions when designing circuits and deciding upon circuit constants in the set. any data, including, but not limited to application circuit diagrams information, described herein are intended only as illustrations of such devices and not as the specifications for such devices. rohm co.,ltd. disclaims any warranty that any use of such devices shall be free from infringement of any third party's intellectual property rights or other proprietary rights, and further, assumes no liability of whatsoever nature in the event of any such infringement, or arising from or connected with or related to the use of such devices. upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or otherwise dispose of the same, no express or implied right or license to practice or commercially exploit any intellectual property rights or other proprietary rights owned or controlled by rohm co., ltd. is granted to any such buyer. products listed in this document are no antiradiation design. appendix1-rev2.0 thank you for your accessing to rohm product informations. more detail product informations and catalogs are available, please contact your nearest sales office. rohm customer support system the americas / europe / asia / japan contact us : webmaster@ rohm.co. jp www.rohm.com copyright ? 2008 rohm co.,ltd. the products listed in this document are designed to be used with ordinary electronic equipment or de vices (such as audio visual equipment, office-automation equipment, communications devices, electrical appliances and electronic toys). should you intend to use these products with equipment or devices which require an extremely high level of reliability and the malfunction of which would directly endanger human life (such as medical instruments, transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers and other safety devices), please be sure to consult with our sales representative in advance. it is our top priority to supply products with the utmost quality and reliability. however, there is always a chance of failure due to unexpected factors. therefore, please take into account the derating characteristics and allow for sufficient safety features, such as extra margin, anti-flammability, and fail-safe measures when designing in order to prevent possible accidents that may result in bodily harm or fire caused by component failure. rohm cannot be held responsible for any damages arising from the use of the products under conditions out of the range of the specifications or due to non-compliance with the notes specified in this catalog. 21 saiin mizosaki- cho, ukyo-ku, kyoto 615-8585, japan tel : +81-75-311-2121 fax : +81-75-315-0172 appendix

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