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| 1/12 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 BD8627EFV description BD8627EFV has realized the high performance and reliability required as a power supply for thin-screen tv. with built-in fet 1ch current mode contro l, the dc/dc converter series has the 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) high efficiency in all load area 2) 3.0a output current 3) low rds(on) internal switches (pchmos:85m ? , nchmos:65m? ) 4) 1% reference voltage accuracy 5) programmable frequency : 250khz-1mhz 6) terminal rt open/short detecting function 7) over current protection function 8) output over voltage/low voltage pr otection function (over : fb > vref +60mv , low : fb < vref -60mv) 9) timer off latch function in abnormal circumstances 10) thermal shutdown function 11) under voltage protection 12) soft start/start delay circuit 13) soft start time out function 14) htssop-b20 package no.09034eat05
technical note 2/12 BD8627EFV www.rohm.com 2009.05 - rev.a ? 2009 rohm co., ltd. all rights reserved. absolute maximum rating (ta=25 ) parameter symbol limits unit input supply voltage v in 7 v input terminal voltage v inp *1 v in v output terminal voltage v out *2 v in v output current i out 4 a power dissipation pd 3.2 technical note 3/12 BD8627EFV www.rohm.com 2009.05 - rev.a ? 2009 rohm co., ltd. all rights reserved. electrical characteristic (unless otherwise noted ta=25 permissible loss 0 25 50 75 100 125 150 1 2 3 4 0 (70mm70mm, thickness 1.6mm, and four layer glass epoxy substrates) when mounting substrate and the package back exposure part are connected with solder. surrounding temperature fig. 1 heat decrease curve technical note 4/12 BD8627EFV www.rohm.com 2009.05 - rev.a ? 2009 rohm co., ltd. all rights reserved. block diagram 2 0 1 9 1 8 1 7 1 6 1 5 1 4 1 3 1 2 1 1 1 2 3 4 5 6 7 8 9 s g n d r t f c p d e t f b r e g e n s w p g n d 10 v i n v i n v i n v i n s w s w s w s s / d e l a y p r e d r i v e detect abnormal voltage and start error o s c e n 0 . 8 v e r r a m p shut down pwm control e n a b l e p g n d p g n d t e s t r e g r e g r e g r e g v i n fig.2 block diagram pin description no. symbol description explanation 1 sgnd signal gnd terminal small signal system gnd 2 fb feed back terminal output voltage detection 3 pdet off latch signal output reset output 4 sw output terminal switching output 5 sw 6 pgnd power gnd terminal gnd for power mosfet 7 pgnd 8 pgnd 9 sw output terminal power mos output 10 sw 11 vin power supply input terminal power supply input. the decoupling is done to pgnd 12 vin 13 vin 14 vin 15 reg internal regulator internal regulator 16 en enable input on/off control for device operation 17 test test terminal gnd short in application set 18 ss/delay soft start adjustment capacity connection terminal the soft start time is adjusted with the connected capacitor 19 fc error amplifier output error amplifier phase compensation point 20 rt frequency adjustment resistance connection terminal the switching frequency is set by the connected resistance technical note 5/12 BD8627EFV www.rohm.com 2009.05 - rev.a ? 2009 rohm co., ltd. all rights reserved. pin equivalence circuit diagram no. symbol explanation terminal equivalent circuit diagram 1 sgnd gnd (connected 0v) 2 fb output voltage detection terminal vin sgnd 2 technical note 6/12 BD8627EFV www.rohm.com 2009.05 - rev.a ? 2009 rohm co., ltd. all rights reserved. no. symbol explanation terminal equivalent circuit diagram 15 reg internal regulator output terminal vin vin sgnd 15 vin vin sgnd 15 technical note 7/12 BD8627EFV www.rohm.com 2009.05 - rev.a ? 2009 rohm co., ltd. all rights reserved. no. symbol explanation terminal equivalent circuit diagram 18 ss soft start time adjustment terminal 19 fc error amplifier compensation terminal 20 rt oscillator frequency adjustment terminal 18 vin sgnd 20 vin sgnd technical note 8/12 BD8627EFV www.rohm.com 2009.05 - rev.a ? 2009 rohm co., ltd. all rights reserved. operation description enable control the device can be controlled on/off by en terminal (16 pin) voltage. an internal circuit starts when ven reaches 0.65v. v en 0 en terminal voltage v ss 0 ss terminal voltage v ssclm v ssth output setting voltage v o 0 t ss v enth pdet v pdet 0 fig.3 on/off transition wave form in en controlling soft start time set function as for BD8627EFV, output can do soft start without overshoot by charging soft start capacity (css) connected between ss and sgnd terminal. also, soft start time (tss) can be set by se tting soft start capacity (css) arbitrarily. technical note 9/12 BD8627EFV www.rohm.com 2009.05 - rev.a ? 2009 rohm co., ltd. all rights reserved. osc oscillation fre quency setting function the output oscillation frequency can be set by connecting resistance between terminal rt (20 pins) and sgnd (range = 250khz - 1mhz) the relation between rt terminal resistance and the oscillation frequency follows fig.4. fig. 4 rt resistance-oscillation frequency 10 100 1000 10000 10 100 1000 10000 rt terminal resistance [k ? ] frequency [khz] technical note 10/12 BD8627EFV 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 usin g under continuous protection operation. low voltage protection function (lvp) the voltage of the terminal fb (2 pins) is compared with internal reference voltage vref. if fb terminal voltage falls below v lvp (= vref -60mv) and the state continues fo r 500us, output changes to low voltage and the state is fixed. in that case , pdet (3pin) output changes to l. table 1 output low voltage protection function en terminal ss terminal fb terminal low voltage protection function low voltage protection operation >v ihen >1.4v(typ) technical note 12/12 BD8627EFV www.rohm.com 2009.05 - rev.a ? 2009 rohm co., ltd. all rights reserved. ordering part number b d 8 6 2 7 e f v - e 2 part no part no. package efv: htssop-b24 packaging and forming specification e2: embossed tape and reel 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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