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| 1/20 www.rohm.com 2010.09 - rev. a ? 2010 rohm co., ltd. all rights reserved. led drivers for lcd backlights white backlight led driver for medium to large lcd panels (switching regulator type) bd8119fm-m description bd8119fm-m is a white led driver with the capability of withstanding high input voltage (36v max). this driver has 4ch constant-c urrent drivers integrated in 1-chip, which each channel can draw up to 150ma max, so that high brightness led driving can be realized. furthermore, a current-mode buck-boost dc/dc controller is al so integrated to achieve stable operation against unstable car-battery voltage input and also to remove the constr aint of the number of leds in series connection. the brightness can be controlled by either pwm or vdac techniques. features 1) input voltage range is 5.0 to 30 v 2) integrated buck-boost cu rrent-mode dc/dc controller 3) four integrated led current driver channels (150ma max. each channel) 4) pwm light modulation (minimum pulse width 25s) 5) built-in protection functions (uvlo, ovp, tsd, ocp, scp) 6) abnormal status detection function (open/ short) 7) hsop-m28 package applications backlight for car navigation, dashboard panels, etc. ( recommended component of toshiba matsushita display technology co.,ltd. ) absolute maximum ratings (ta=25 ) parameter symbol ratings unit power supply voltage v cc 36 v boot voltage v boot 41 v sw,cs,outh voltage v sw, v cs, v outh 36 v boot-sw voltage v boot-sw 7 v led output voltage v led1 4 36 v vreg, ovp, outl, fail1, fail2, leden1, leden2, iset, vdac, pwm, ss, comp, rt, sync, en voltage v vreg, v ovp, v outl, v fail1, v fail2, v leden1, v leden2, v iset, v vdac, v pwm, v ss, v comp, v rt, v sync, v en -0.3 7 < v cc v power consumption pd 2.20 1 w operating temperature range topr -40 +95 storage temperature range tstg -55 +150 led maximum output current i led 150 2 3 ma 1 ic mounted on glass epoxy board measuring 70mm70mm 1.6mm, power dissipated at a rate of 17.6mw/ at temperatures above 25 . 2 dispersion figures for led maximum output current and v f are correlated. please refer to data on separate sheet. 3 amount of current per channel. operating conditions (ta=25 ) parameter symbol ratings unit power supply voltage v cc 5.0 30 v oscillating frequency range f osc 250 550 khz external synchronization frequency range 4 5 f sync fosc 550 khz external synchronization pulse duty range f sduty 4060 % 4 connect sync to gnd or open when not using external frequency synchronization. 5 do not switch between internal and external synchronization when an external synchronization signal is input to the device. no.10040eat17
technical note 2/20 www.rohm.com 2010.09 - rev. a ? 2010 rohm co., ltd. all rights reserved. bd8119fm-m technical note 3/20 www.rohm.com 2010.09 - rev. a ? 2010 rohm co., ltd. all rights reserved. bd8119fm-m technical note 4/20 www.rohm.com 2010.09 - rev. a ? 2010 rohm co., ltd. all rights reserved. bd8119fm-m output voltage:vreg [v] outputcurrent :iled [ma] efficiency technical note 5/20 www.rohm.com 2010.09 - rev. a ? 2010 rohm co., ltd. all rights reserved. bd8119fm-m technical note 6/20 www.rohm.com 2010.09 - rev. a ? 2010 rohm co., ltd. all rights reserved. bd8119fm-m ? iled vs gain 2950 3000 3050 3100 3150 3200 3250 3300 3350 0 20 40 60 80 100 120 140 160 iled[ma] gain iled[ma] gain 10 3215 20 3080 30 3030 40 2995 50 3000 60 3020 70 3040 80 3070 90 3105 100 3140 110 3175 120 3210 130 3245 140 3280 150 3330 technical note 7/20 www.rohm.com 2010.09 - rev. a ? 2010 rohm co., ltd. all rights reserved. bd8119fm-m ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? technical note 8/20 www.rohm.com 2010.09 - rev. a ? 2010 rohm co., ltd. all rights reserved. bd8119fm-m ? ? ? ? ? ? ? ? ? ? ? ? technical note 9/20 www.rohm.com 2010.09 - rev. a ? 2010 rohm co., ltd. all rights reserved. bd8119fm-m ? ? ? Q technical note 10/20 www.rohm.com 2010.09 - rev. a ? 2010 rohm co., ltd. all rights reserved. bd8119fm-m technical note 11/20 www.rohm.com 2010.09 - rev. a ? 2010 rohm co., ltd. all rights reserved. bd8119fm-m technical note 12/20 www.rohm.com 2010.09 - rev. a ? 2010 rohm co., ltd. all rights reserved. bd8119fm-m 1. computation of the input peak current and il_max ? ? ? ? D D D technical note 13/20 www.rohm.com 2010.09 - rev. a ? 2010 rohm co., ltd. all rights reserved. bd8119fm-m 5. selection of the output capacitor select the output capacitor cout based on th e requirement of the ripple voltage vpp. vpp = ? ? ? ? technical note 14/20 www.rohm.com 2010.09 - rev. a ? 2010 rohm co., ltd. all rights reserved. bd8119fm-m 8. setting of the over-voltage protection we recommend setting the over-voltage protection vovp 1.2v to 1.5v greater than vout which is adjusted by the number of leds in series connection. less than 1.2v may cause unexpected detection of the led open and short during the pwm brightness control. fo r the vovp greater than 1.5v, the led short detection may become invalid. 9. setting of the soft-start the soft-start allows minimization of the coil current as we ll as the overshoot of the out put voltage at the start-up. for the capacitance we recommend in the range of 0.001 ? technical note 15/20 www.rohm.com 2010.09 - rev. a ? 2010 rohm co., ltd. all rights reserved. bd8119fm-m technical note 16/20 www.rohm.com 2010.09 - rev. a ? 2010 rohm co., ltd. all rights reserved. bd8119fm-m technical note 17/20 www.rohm.com 2010.09 - rev. a ? 2010 rohm co., ltd. all rights reserved. bd8119fm-m ? ? ? ? ? ? ? ? ? ? ? ? ? technical note 18/20 www.rohm.com 2010.09 - rev. a ? 2010 rohm co., ltd. all rights reserved. bd8119fm-m technical note 19/20 www.rohm.com 2010.09 - rev. a ? 2010 rohm co., ltd. all rights reserved. bd8119fm-m ? ? technical note 20/20 www.rohm.com 2010.09 - rev. a ? 2010 rohm co., ltd. all rights reserved. bd8119fm-m ? order quantity needs to be multiple of the minimum quantity. r1010 a www.rohm.com ? 2010 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 specified herein is subject to change for improvement without notice. the content specified 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 specifications, 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 specified 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 specified 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 specified in this document are intended to be used with general-use electronic equipment or devices (such as audio visual equipment, office-automation equipment, commu- nication devices, electronic appliances and amusement devices). the products specified 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, fire or any other damage caused in the event of the failure of any product, such as derating, redunda ncy, fire 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, aerospac e 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 specified 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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