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| 1/16 www.rohm.com 2011.07 - rev.b ? 2011 rohm co., ltd. all rights reserved. single-chip type with built-in fet switching regulators flexible step-down switching regulator with built-in power mosfet BD9673EFJ description output 1.5a and below high efficiency rate step-down swit ching regulator power mosfet internal type BD9673EFJ mainly used as secondary side power supply, for example from fixed power supply of 12v, 24v etc, step-down output of 1.2v/1.8v/3.3v/5v, etc, c an be produced. this ic has external coil/capacitor down-sizing through 300 khz frequency operation, inside nch-fet sw for 45v ?withstand-pressure? commutation and also, high speed load response through current mode control is a simple external setting phase comp ensation system, through a wide range external constant, a compact power supply can be produced easily. features 1) internal 200 m ? nch mosfet 2) output current 1.5a 3) oscillation frequency 300khz 4) synchronizes to external clock ( 200khz 500khz ) 5) feedback voltage 1.0v1.0% 6) internal soft start function 7) internal over current protect circuit, low in put error prevention circuit, heat protect circuit 8) on/off control through en pin (standby current 0 a typ.) 9) package: htsop-j8 package applications for household machines in general that have 12v/24v lines, etc. absolute maximum rating parameter symbol ratings unit vcc-gnd supply voltage vcc 45 v bst-gnd voltage vbst 50 v bst-lx voltage Svbst 7 v en-gnd voltage ven 45 v lx-gnd voltage vlx 45 v fb-gnd voltage vfb 7 v vc-gnd voltage vc 7 v sync-gnd voltage sync 7 v high-side fet drain current idh 2.0 a power dissipation pd 3.76 (*1) w operating temperature topr -40 +105 storage temperature ts t g - 5 5 +150 junction temperature tjmax +150 (*1)during mounting of 70701.6t mm 4layer board (copper area:70mm70mm).reduce by 30.08mw for every 1 increase. (above 25 ) operating conditions (ta=25 ) parameter symbol ratings unit min. typ. max. power supply voltage vcc 7 42 v output voltage vout 1.0 (*2) vcc0.7 v (*2)restricted by minimum on pulse typ. 200ns no.11027ebt57
technical note 2/16 www.rohm.com 2011.07 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD9673EFJ ? ? technical note 3/16 www.rohm.com 2011.07 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD9673EFJ ? ? technical note 4/16 www.rohm.com 2011.07 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD9673EFJ ? ? technical note 5/16 www.rohm.com 2011.07 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD9673EFJ ? technical note 6/16 www.rohm.com 2011.07 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD9673EFJ 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 -60 -40 -20 0 20 40 60 80 100 120 icc[ua] temp[ ] vcc=12v vcc=24v vcc=36v vcc=42v 0 0.5 1 1.5 2 -60 -40 -20 0 20 40 60 80 100 120 icc[ma] temp[ ] vcc=42v vcc=36v vcc=24v vcc=12v 0 0.5 1 1.5 2 0 5 10 15 20 25 30 35 40 45 icc[ma] vcc[v] temp= \ 40 temp=25 temp=105 0.990 ? 0.992 ? 0.994 ? 0.996 ? 0.998 ? 1.000 ? 1.002 ? 1.004 ? 1.006 ? 1.008 ? 1.010 ? -60 -40 -20 0 20 40 60 80 100 120 vfb ? threshold[v] temp[ ] vcc=12v vcc=24v vcc=42v vcc=36v 0.990 ? 0.992 ? 0.994 ? 0.996 ? 0.998 ? 1.000 ? 1.002 ? 1.004 ? 1.006 ? 1.008 ? 1.010 ? 0 5 10 15 20 25 30 35 40 45 vfb ? threshold[v] vcc[v] temp=105 temp=25 temp= \ 40 250 260 270 280 290 300 310 320 330 340 350 -60 -40 -20 0 20 40 60 80 100 120 frequency[khz] temp[ ] \ 60 \ 50 \ 40 \ 30 \ 20 \ 10 0 10 20 30 40 50 60 00.511.52 vc ? terminal ? current[ua] vfb[v] temp=105 temp=25 temp= \ 40 0 1 2 3 4 5 6 7 8 -60 -40 -20 0 20 40 60 80 100 120 uvlo ? threshold[v] temp[ ] reset ? voltage detect ? voltage 0 10 20 30 40 50 60 70 80 90 100 -60 -40 -20 0 20 40 60 80 100 120 maxduty[%] temp[ ] technical note 7/16 www.rohm.com 2011.07 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD9673EFJ 0 5 10 15 20 -60 -40 -20 0 20 40 60 80 100 120 precharge ? fet ? ron ? [ ] temp[ ] 0 50 100 150 200 250 300 -60 -40 -20 0 20 40 60 80 100 120 highside ? fet ? ron ? [m ] temp[ ] 0 2 4 6 8 10 12 14 16 -60 -40 -20 0 20 40 60 80 100 120 soft ? start ? time[ms] temp[ ] vcc=42v vcc=36v vcc=24v vcc=12v 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 -60 -40 -20 0 20 40 60 80 100 120 vc ? to ? sw ? current ? transconductance[a/v] temp[ ] 0 0.5 1 1.5 2 -60 -40 -20 0 20 40 60 80 100 120 en ? threshold[v] temp[ ] 0 1 2 3 4 5 6 -60 -40 -20 0 20 40 60 80 100 120 ocp_peak_current[a] temp[ ] vcc=12v vcc=24v vcc=36v vcc=42v fig.18. vc to sw current transconductance temperature characteristics fig.19. en threshold temperature characteristics fig.17. ocp detect current temperature characteristics fig.14. soft start time temperature characteristics fig.15. nch fet on resistance temperature characteristics fig.16. pre-charge fet on resistance temperature characteristics technical note 8/16 www.rohm.com 2011.07 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD9673EFJ fig.27 stop waveform fig.20 reference application circuit fig.21 electric power conversion rate fig.24 load response characteristics (io=0a 0 10 20 30 40 50 60 70 80 90 100 0 500 1000 1500 transformation ? efficiency ? [%] load ? current[ma] vcc=12v vcc=24v vcc=36v vcc=42v phase gain phase gain vout ? ? ? technical note 9/16 www.rohm.com 2011.07 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD9673EFJ technical note 10/16 www.rohm.com 2011.07 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD9673EFJ S S S S ??? S ??? technical note 11/16 www.rohm.com 2011.07 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD9673EFJ (5) about adjustment of dc/dc comp arator frequency characteristics role of phase compensation element cc1, cc2, rc (s ee p.7 example of reference application circuit) stability and responsiveness of loop are controlled thro ugh vc pin which is the output of error amp. the combination of zero and pole that determines stability and responsiveness is adjus ted by the combination of resistor and capacitor that are connected in series to the vc pin. dc gain of voltage return loop can be calculated for using the following formula. here, vfb is feedback voltage (1.0v).a ea is voltage gain of error amplifier (typ : 77db), gcs is the trans-conductance of current detect (typ : 10a/v), and rl is the output load resistance value. there are 2 important poles in the control loop of this dc/dc. the first occurs with/ through the output resistance of p hase compensation capacitor (c1) and error amplifier. the other one occurs with/through the output capacitor and load resistor. these poles appear in the frequency written below. here, g ea is the trans-conductance of error amplifier(typ : 220a/v). here, in this control loop, one zero becomes important. with the zero which occurs because of phase compensati on capacitor c1 and phase compensation resistor r3, the frequency below appears. also, if output capacitor is big, and t hat esr (resr) is big, in this contro l loop, there are cases when it has an important, separate zero (esr zero). this esr zero occurs due to esr of output capacitor and capacitance, and exists in the frequency below. (esr zero) in this case, the 3 rd pole determined with the 2 nd phase compensation capacitor (c2) and phase correction resistor (r3) is used in order to correct the esr zero results in loop gain. this pole exists in the frequency shown below. (pole that corrects esr zero) the target of phase compensation desi gn is to create a communication function in order to acquire necessary band and phase margin. cross-over frequency (band) at which loop gai n of return loop becomes ?0? is important. when cross-over frequency becomes low, power supply fluctuation response, load response, etc worsens. on the other hand, when cross-over frequency is too high, instability of the loop can occur. tentatively, cross-over frequency is targeted to be made 1/20 or below of switching frequency. vout v a gcs rl a dc fb e a ? ?? ? ? ? ? ? ? ? ? ? ? technical note 12/16 www.rohm.com 2011.07 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD9673EFJ selection method of phase compensation constant is shown below. 1. phase compensation resistor (r3) is selected in order to set to the desired cross-over frequency. calculation of rc is done using the formula below. here, fc is the desired cross-over frequency. it is made about 1/20 and below of the normal switching frequency (fs). 2. phase compensation capacitor (c1) is selected in order to achieve the desired phase margin. in an application that has a representati ve inductance value (about several h ? ? ? ? ? ? ?? ? ? technical note 13/16 www.rohm.com 2011.07 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD9673EFJ technical note 14/16 www.rohm.com 2011.07 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD9673EFJ ? technical note 15/16 www.rohm.com 2011.07 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD9673EFJ (12) about ic pin input this ic is a monolithic ic, and between each element, it has p + isolation for element separation and p board. with the n layer of each element and this, the p-n junction is forme d, and the parasitic element of each type is composed. for example, like the diagram below, when resistor and transistor is connected to pin, technical note 16/16 www.rohm.com 2011.07 - rev.b ? 2011 rohm co., ltd. all rights reserved. BD9673EFJ (unit : mm) htsop-j8 0.08 s 0.08 m s 1.0max 0.850.05 1.27 0.080.08 0.42 +0.05 - 0.04 1.050.2 0.650.15 4 + 6 ? 4 0.17 +0.05 - 0.03 234 568 (max 5.25 include burr) 7 1 0.545 (3.2) 4.90.1 6.00.2 (2.4) 3.90.1 1pin mark ? order quantity needs to be multiple of the minimum quantity. r1120 a www.rohm.com ? 2011 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 produc ts. 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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