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| 1/14 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 bd8628efv, BD8624EFV description bd8628efv / BD8624EFV have realized the high performance and reliability required as a power supply for thin-screen tv. with built-in fet 1ch current mode cont rol, the dc/dc converter series has t he advantage of high-speed load response and wide phase margin. due to the high-speed load response, it is most suitable fo r tv-purpose processors with increasingly 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 protecti on circuits (overcurrent protection, output voltage abnormal protection, thermal protection, and off-latc h function at the time of abnormality etc. ), therefore as an advantage it does not easily damage in every possible abnormal condition such as all-pin short circuit test etc. and hence most suitable for thin-screen tv which requires the high reliability. features 1) 11ch synchronous rectification step-down system dc/dc converter 2) soft start, soft off function 3) built-in low voltage / overvoltage protection function 4) built-in overcurrent protection function 5) frequency setting by external resistance is available. (rt terminal) 6) protection time setting by external resistance is available. (rset terminal) 7) built-in rt / rset terminal open/short protection function 8) protection control with built-in sequencer 9) built-in adjustment function time of off latch 10) built-in error state detection signal output function 11) built-in tracking function 12) corresponded to protecting bus 13) load current maximum 3a 14) htssop-b24 package no.09034eat06
technical note 2/14 bd8628efv, BD8624EFV www.rohm.com 2009.05 - rev. a ? 2009 rohm co., ltd. all rights reserved. electric characteristic (ta=25 ? ? technical note 3/14 bd8628efv, BD8624EFV www.rohm.com 2009.05 - rev. a ? 2009 rohm co., ltd. all rights reserved. permissible loss this package is a product of which the feature is the high heat radiation, and connect the back to gnd based on recommended land pattern when you mount. 0 25 50 75 100 125 150 1 2 3 4 0 ambient temperature figure.1 heat decrease curve technical note 4/14 bd8628efv, BD8624EFV www.rohm.com 2009.05 - rev. a ? 2009 rohm co., ltd. all rights reserved. block diagram seq control vref ovp lvp osc driver control 12 1 3 21 11 1 6 1 5 1 4 1 7 protect bus i/f rt open/short ctl 10 time 20 vcc rt rset pdet pio ctl sw sw pgnd pgnd test1 test2 pvcc pvcc boot vreg5 fc fb ss gnd 22 osc osc vreg5 23 24 figure.2 block diagram , application diagram terminal explan ation table 1 terminal explanation no. symbol description no. symbol description 1 pgnd power gnd terminal 13 rt frequency adjustment resistance connection terminal 2 pgnd power gnd terminal 14 rset off latch effective time adjustment resistance terminal 3 n.c. no wire connection. (connect to gnd. ) 15 pdet error state notification terminal 4 n.c no wire connection. (connect to gnd. ) 16 pio error state notification and external ic error detection terminal 5 sw sw terminal 17 ctl enable input 6 sw sw terminal 18 vcc vcc power supply terminal 7 boot high side power mos gate drive power source terminal 19 pvcc power vcc terminal 8 vreg5 internal power supply (5.0v) output terminal 20 pvcc power vcc terminal 9 gnd gnd 21 test2 test terminal (connect to gnd. ) 10 fc phase amends terminal 22 test1 test terminal (connect to gnd. ) 11 fb feedback terminal 23 n.c. no wire connection. (connect to gnd. ) 12 ss soft start adjustment capacity connection terminal 24 n.c. no wire connection. (connect to gnd. ) technical note 5/14 bd8628efv, BD8624EFV www.rohm.com 2009.05 - rev. a ? 2009 rohm co., ltd. all rights reserved. terminal no. terminal name explanation terminal equivalent circuit chart 1 pgnd power gnd (the same potential as the gnd terminal) 2 pgnd power gnd (the same potential as the gnd terminal) 5 sw sw terminal 6 sw sw terminal 7 boot high side power mos gate drive power source terminal 8 vreg5 internal power supply (5.0v) output terminal 9 gnd gnd 10 fc phase amends terminal pvcc pvcc pgnd vreg5 pgnd technical note 6/14 bd8628efv, BD8624EFV www.rohm.com 2009.05 - rev. a ? 2009 rohm co., ltd. all rights reserved. terminal no. terminal name explanation terminal equivalent circuit chart 11 fb voltage detection terminal 12 ss soft start adjustment capacity connection terminal 13 rt frequency adjustment resistance connection terminal 14 rset off latch effective time adjustment resistance terminal 15 pdet error state notification terminal vcc gnd ? vcc technical note 7/14 bd8628efv, BD8624EFV www.rohm.com 2009.05 - rev. a ? 2009 rohm co., ltd. all rights reserved. terminal no. terminal name explanation terminal equivalent circuit chart 16 pio error state notification and external ic error detection terminal 17 ctl enable input 21 test2 test terminal (connect to gnd. ) 22 test1 test terminal (connect to gnd. ) 19 pvcc power vcc terminal 20 pvcc power vcc terminal technical note 8/14 bd8628efv, BD8624EFV www.rohm.com 2009.05 - rev. a ? 2009 rohm co., ltd. all rights reserved. operation description on/off control dc/dc converter on/off function dc/dc converter controller can be controlled on/off by ctl terminal. analog circuit starts operation at on control ( on mode), and goes down to setting output voltage. analog circuit should be standby at off contro l (off mode), and output voltage becomes 0v. table2 dc/dc converter on/off function ctl terminal voltage >vihctl on control technical note 10/14 bd8628efv, BD8624EFV www.rohm.com 2009.05 - rev. a ? 2009 rohm co., ltd. all rights reserved. protect bus input/output function the terminal pio is protect bus input/output terminal. t he terminal pio is hi-z when dc/dc usually operates. when the terminal pio becomes low by connecting protect bus, dc/dc is turned off. afterwards, when the terminal pio becomes high, it reactivates. dc/dc is off latch when dc/dc error detects it and the terminal pdet becomes low. table3 pio terminal, pdet terminal output function dc/dc error detection pio terminal pdet terminal dc/dc undetection hi-z hi-z on undetection low hi-z off detection low low off latch protect bus timing chart if two or more bd8628efv//bd8624fv is connected in protect bus, and it uses at the same time, when one ic error detects, all remaining ic becomes pio = low at the same time, and the output is turned off. protecting bus part timing chart ic_a pdet ic_a pio high off latch when two or more bd8628efv/bd8624fv is used at the same time, if one ic error detects, all ic becomes dc/dc off at the same time. ic_b pio dc/dc off ic_b pdet ic_a detects error. ic_b vo high high high low low low 0v pio ic_a pio ic_b technical note 11/14 bd8628efv, BD8624EFV www.rohm.com 2009.05 - rev. a ? 2009 rohm co., ltd. all rights reserved. protection function protection circuit is effective for destruction prevention due to accident so that avoid using by continuous protection operati on. low voltage protection function(lvp) low voltage protection function detects set output voltage vo from fb terminal and off-latched dc/dc converter compared to internal reference level. low voltage protection function operates when fb terminal voltage falls below vlvp (=0.7 x vref) and continues more than set time in exte rnal resistance. table 4 low voltage protection function ctl terminal ss terminal fb terminal low voltage protection function low voltage protection operation >vihctl >1.1v(typ) technical note 14/14 bd8628efv, BD8624EFV www.rohm.com 2009.05 - rev. a ? 2009 rohm co., ltd. all rights reserved. htssop-b24 12 13 24 1 0.08 m 0.08 s +0.05 +6 ?4 ?0.03 +0.05 ?0.04 7.6 0.2 1.0max. 7.8 0.1 4 0.17 0.65 0.2 0.325 0.53 0.15 0.85 0.05 0.08 0.05 1 0.2 5.6 0.1 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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