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| 1/26 www.rohm.com 2011.06 - rev.c ? 2011 rohm co., ltd. all rights reserved. led drivers for lcd backlights white backlight led driver for medium to large lcd panels (switching regulator type) BD6583MUV-A description BD6583MUV-A is white led driver ic with pwm step-up dc/dc c onverter that can boost max 42.5v and current driver that can drive max 25ma. the wide and precis ion brightness can be controlled by external pwm pulse. BD6583MUV-A has very accurate current drivers, and it has few current errors between each strings. so, it will be helpful to reduce brightness spots on the lcd.small package type is suited for saving space. features 1) high efficiency pwm step-up dc/dc converter (fsw=1mhz), max efficiency 93% 2) high accuracy & good matching (3%) current drivers 6ch 3) drive up to 12 * in series, 6 strings in parallel =72 white leds ( * white led vf=3.5vmax) 4) wide input voltage range (2.7v ~ 22v) 5) rich safety functions ? over-voltage protection (ovp) ? over current limit ? external sbd open detect ? thermal shutdown 6) small & thin package (vqfn024v4040) 4.0 4.0 1.0mm applications all middle size lcd equipments backlight of notebook pc, portable dvd player, car navigation systems, etc. absolute maximum ratings (ta=25 ) parameter symbol ratings unit condition maximum applied voltage 1 vmax1 7 v test,vreg,sensp,sensn,sw,rstb, pwmpow,pwmdrv,failsel,iseth,isetl maximum applied voltage 2 vmax2 25 v led1, led2, led3, led4, led5, led6, vbat maximum applied voltage 3 vmax3 50.5 v vdet power dissipation 1 pd1 500 mw *1 power dissipation 2 pd2 780 mw *2 power dissipation 3 pd3 1510 mw *3 operating temperature range topr -30 ~ +85 - storage temperature range tstg -55 ~ +150 - (*1) reduced 4.0mw/ with ta>25 when not mounted on a heat radiation board. (*2) 1 layer (rohm standard board) has been mounted. copper foil area 0mm 2 , when it?s used by more than ta=25 , it?s reduced by 6.2mw/ . (*3) 4 layer (jedec compliant board) has been mounted. copper foil area 1layer 6.28mm 2 , copper foil area 2~4layers 5655.04mm 2 , when it?s used by more than ta=25 , it?s reduced by 12.1mw/ . recommended operating range (ta=-30 ~ +85 ) parameter symbol ratings unit condition min. typ. max. power supply voltage vbat 2.7 12.0 22.0 v no.11040ect32
technical note 2/26 www.rohm.com 2011.06 - rev.c ? 2011 rohm co., ltd. all rights reserved. BD6583MUV-A ? ? ? ? ? technical note 3/26 www.rohm.com 2011.06 - rev.c ? 2011 rohm co., ltd. all rights reserved. BD6583MUV-A 2.2 2.22 2.24 2.26 2.28 2.3 -60 25 110 ta [ o c] vbat [v] 0 2 4 6 8 10 12 14 16 18 20 0 10203040506070809010 0 duty (%) led current (ma) 60% 65% 70% 75% 80% 85% 90% 95% 100% 0 102030405060708090100 duty [%] efficiency [] 60% 65% 70% 75% 80% 85% 90% 95% 100% 0 102030405060708090100 duty [%] efficiency [] 0 2 4 6 8 10 12 14 16 18 20 0 10203040506070809010 0 duty (%) led current (ma) 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 00.511.522.533.544.55 duty (%) led current(ma) 0 2 4 6 8 10 12 14 16 18 20 0 10203040506070809010 0 duty (%) led current(ma) 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 00.511.522.533.544.55 duty (%) led current(ma) 0 2 4 6 8 10 12 14 16 18 20 0 102030405060708090100 duty (%) led current(ma) technical note 4/26 www.rohm.com 2011.06 - rev.c ? 2011 rohm co., ltd. all rights reserved. BD6583MUV-A fig.21 line transient (22v to 10v) fig.18 vout response power control pwm (pwmpow) fig.22 vout@ovp (led open) vout icc led curren t pwmpo w vout led current vbat vout led current 400 s no peak 14ms vbat vout led curren t no peak pwmdrv vout 10ma/div 350mv 180mv 10ma/div 15.70 15.75 15.80 15.85 15.90 15.95 16.00 16.05 16.10 16.15 16.20 16.25 16.30 -60 -40 -20 0 20 40 60 80 100 120 temp [oc] ledcurrent [ma] technical note 5/26 www.rohm.com 2011.06 - rev.c ? 2011 rohm co., ltd. all rights reserved. BD6583MUV-A technical note 6/26 www.rohm.com 2011.06 - rev.c ? 2011 rohm co., ltd. all rights reserved. BD6583MUV-A ? current sence s q r - + - + over voltage protect sbd open protect vin detector :w reg internal power suplly vdet sw uvlo :w rstb 300k ? ? ? ? ? ? ? technical note 7/26 www.rohm.com 2011.06 - rev.c ? 2011 rohm co., ltd. all rights reserved. BD6583MUV-A ? 10 ? ? 10 ? ? 10 ? ? 10 ? ? technical note 8/26 www.rohm.com 2011.06 - rev.c ? 2011 rohm co., ltd. all rights reserved. BD6583MUV-A ? ? ? ? ? ? ? ? ? technical note 9/26 www.rohm.com 2011.06 - rev.c ? 2011 rohm co., ltd. all rights reserved. BD6583MUV-A 4) external sbd open detect and over voltage protection BD6583MUV-A has over boost protection by external sbd open and over voltage protection. it detects vdet voltage and is stopped output tr in abnormal condition. details are as shown below. ? ? ? ? ? ? ? technical note 10/26 www.rohm.com 2011.06 - rev.c ? 2011 rohm co., ltd. all rights reserved. BD6583MUV-A (example 2) in case of, vin=12.0v, l=4.7h, fsw=1m hz, vout=39v, iout=80ma, efficiency=85% ipeak = (12.0v / 4.7h) (1 / 1mhz) (1-(12v / 39v)) =1.77a iave = (39v 80ma / 12.0v) / 85% = 0.31a ton = (0.31a (1-12 v / 39v) (1 / 1mhz) ( 4.7h /12 v) 2) 1/2 = 0.41s (1-vin/vout) (1 /fsw)=0.69s > ton peak current = 12v/4.7h 0.41s = 1.05a *when too large current is set, output oversh oot is caused, be careful enough because it is led to break down of the ic in case of the worst. ? ? ? technical note 11/26 www.rohm.com 2011.06 - rev.c ? 2011 rohm co., ltd. all rights reserved. BD6583MUV-A ? ? technical note 12/26 www.rohm.com 2011.06 - rev.c ? 2011 rohm co., ltd. all rights reserved. BD6583MUV-A in addition, the selection number of parallel number of the current driver is changed, the power-supply current of rstb will be increased. because the maximum value of the consumption current at the rstb=2.1v is indicated in the following table 1, be careful enough when you calcul ate the restriction resistance. table1. the use parallel number of current driver at rstb=2.1v , 100 ? ? ? technical note 13/26 www.rohm.com 2011.06 - rev.c ? 2011 rohm co., ltd. all rights reserved. BD6583MUV-A ? ? ? ? o f technical note 14/26 www.rohm.com 2011.06 - rev.c ? 2011 rohm co., ltd. all rights reserved. BD6583MUV-A ? ? ? ? technical note 15/26 www.rohm.com 2011.06 - rev.c ? 2011 rohm co., ltd. all rights reserved. BD6583MUV-A ? ? ? ? ? ? ? ? ? ? ? ? 10 ? ? technical note 16/26 www.rohm.com 2011.06 - rev.c ? 2011 rohm co., ltd. all rights reserved. BD6583MUV-A technical note 17/26 www.rohm.com 2011.06 - rev.c ? 2011 rohm co., ltd. all rights reserved. BD6583MUV-A technical note 18/26 www.rohm.com 2011.06 - rev.c ? 2011 rohm co., ltd. all rights reserved. BD6583MUV-A ? ? ? ? ? ? ? ? technical note 19/26 www.rohm.com 2011.06 - rev.c ? 2011 rohm co., ltd. all rights reserved. BD6583MUV-A ? ? ? ? ? ? 10 ? ? 10 ? ? 10 ? ? technical note 20/26 www.rohm.com 2011.06 - rev.c ? 2011 rohm co., ltd. all rights reserved. BD6583MUV-A ? ? ? ? ? ? 10 ? ? 10 ? ? 10 ? ? 10 ? ? technical note 21/26 www.rohm.com 2011.06 - rev.c ? 2011 rohm co., ltd. all rights reserved. BD6583MUV-A ? ? ? ? ? ? 10 ? ? 10 ? ? 10 ? ? 10 ? ? technical note 22/26 www.rohm.com 2011.06 - rev.c ? 2011 rohm co., ltd. all rights reserved. BD6583MUV-A ? ? ? ? ? ? 10 ? ? 10 ? ? 10 ? ? technical note 23/26 www.rohm.com 2011.06 - rev.c ? 2011 rohm co., ltd. all rights reserved. BD6583MUV-A ? ? ? ? ? ? 10 ? ? 10 ? ? 10 ? ? technical note 24/26 www.rohm.com 2011.06 - rev.c ? 2011 rohm co., ltd. all rights reserved. BD6583MUV-A 10 ? ? ? ? ? ? ? technical note 25/26 www.rohm.com 2011.06 - rev.c ? 2011 rohm co., ltd. all rights reserved. BD6583MUV-A (8) inspection with set pcb on the inspection with the set pcb, if a capacitor is connected to a low-impedance ic terminal, the ic can suffer stress. therefore, be sure to discharge from the set pcb by each process. furthermore, in order to mount or dismount the set pcb to/from the jig for the inspection process, be sure to turn off the power supply and then mount the set pcb to the jig. after the completion of the inspection, be sure to turn off the power supply and then dismount it from the jig. in addition, for protection against static electricity, establish a ground for the assembly process and pay thorough attention to the transportation and the storage of the set pcb. (9) input terminals in terms of the construction of ic, parasitic elements are inevitably formed in relation to potential. the operation of the parasitic element can cause interference with circuit operation, thus resulting in a malfunction and then breakdown of the input terminal. therefore, pay thorough attention not to handle the input terminals, such as to apply to the input terminals a voltage lower than the gnd respectively, so that any parasitic element will operate. furthermore, do not apply a voltage to the input terminals when no power supply voltage is applied to the ic. in addition, even if the power supply voltage is applied, apply to the input terminals a voltage lower than the power supply voltage or within the guaranteed value of electrical characteristics. (10) ground wiring pattern if small-signal gnd and large-current gnd are provided, it will be recommended to separate the large-current gnd pattern from the small-signal gnd pattern and establish a si ngle ground at the reference point of the set pcb so that resistance to the wiring pattern and voltage fluctuations due to a large current will cause no fluctuations in voltages of the small-signal gnd. pay attention not to cause fluctuations in the gnd wiring pattern of external parts as well. (11) external capacitor in order to use a ceramic capacitor as the external capaci tor, determine the constant with consideration given to a degradation in the nominal capacitance due to dc bias and c hanges in the capacitance due to temperature, etc. (12) thermal shutdown circuit (tsd) when junction temperatures become 175c (typ) or higher, the thermal shutdown circuit operates and turns a switch off. the thermal shutdown circuit, which is aimed at isolating the lsi from thermal runaway as much as possible, is not aimed at the protection or guarantee of the lsi. therefore, do not continuously use the ls i with this circuit operating or use the lsi assuming its operation. (13) thermal design perform thermal design in which there are adequate margins by taking into account the permissible dissipation (pd) in actual states of use. (14) selection of coil select the low dcr inductors to decrease power loss for dc/dc converter. technical note 26/26 www.rohm.com 2011.06 - rev.c ? 2011 rohm co., ltd. all rights reserved. BD6583MUV-A (unit : mm) vqfn024v4040 0.08 s s 16 7 12 19 24 13 18 0.40.1 0.02 +0.03 - 0.02 1pin mark 2.40.1 c0.2 0.5 4.00.1 0.75 2.40.1 4.00.1 1.0max (0.22) 0.25 +0.05 - 0.04 ? 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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