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1/10 www.rohm.com 2012.03 - rev. a ? 2012 rohm co., ltd. all rights reserved. dc brushless motor driv ers for cooling fans three-phase full-wave fan motor driver for note pc bh6717nuv description bh6717nuv is a three-phase sensorless fan motor driver us ed to cool off notebook pcs. it is controlled by a variable speed provided through the pwm input signal . its feature is sensorless drive wh ich doesn?t require a hall device as a location detection sensor and motor downsizing can be achiev ed by limiting the number of external components as much as possible. furthermore, introducing a direct pwm soft swit ched driving mechanism achieves silent operations and low vibrations. features 1) speed controllable by pwm input signal 2) sensorless drive 3) soft switched drive 4) power save function applications small fan motor notebook pcs etc absolute maximum ratings(ta=25 ?c) parameter symbol ratings unit supply voltage vcc ? 0.3 6.5 v power dissipation pd 560 * mw operating temperature topr -25 +95 ?c storage temperature ts t g - 5 5 +125 ?c output current iomax 700 ** ma fg signal output voltage vfg 6.5 v fg signal output current ifg 6 ma junction temperature tjmax 125 ?c * reduce by 5.6mw/ ? c over 25/ ? c. (on 70mm 70mm 1.6mm glass epoxy board) ** this value is not to exceed pd. operating conditions parameter symbol ratings unit operating supply voltage range vcc 1.8 5.5 v *these specifications might change for their improvement etc. no.12010eat18
technical note 2/10 bh6717nuv www.rohm.com 2012.03 - rev. a ? 2012 rohm co., ltd. all rights reserved. ? ? package outlines ? (unit
technical note 3/10 bh6717nuv www.rohm.com 2012.03 - rev. a ? 2012 rohm co., ltd. all rights reserved. * ??? open collector output. a pull-up resistances of 10k ? should be inserted?? * ??? the wiring patterns from the vcc terminal and gnd terminal to the bypass capacitor must be routed as short as possible. with respect to the wiring pattern, it has been confirmed that 0.03
? for 1uf at the bypass capacitor doesn?t cause problems under our operation environment. this can be used as a reference value to check for validity. ? * * heat rejection circuit pre : pre driver uvlo : under voltage lock out circuit ? bemf det : induced electromotive voltage detection circuit det level : offset circuit
technical note 4/10 bh6717nuv www.rohm.com 2012.03 - rev. a ? 2012 rohm co., ltd. all rights reserved. ?
technical note 5/10 bh6717nuv www.rohm.com 2012.03 - rev. a ? 2012 rohm co., ltd. all rights reserved. 5. power saving function / speed control by pwm input the power saving function is controlled by an input logic of the pwm terminal. (a) operate mode when the pwm terminal is high. (b) standby mode when the pwm terminal is low for a time period of 1ms (typ.). when the pwm terminal is open, high logic is set. input logic of the pwm terminal is set at low and then th e standby mode becomes effective 1ms (typ.) (fig.2). in the standby mode, the lock protection f unction is deactivated and the lock protecti on is not effective. therefore, this device can start up instantly even from the stop state when the input logic of the pwm terminal is set at high. fig.2 ? u phase voltage v phase voltage w phase voltage
technical note 6/10 bh6717nuv www.rohm.com 2012.03 - rev. a ? 2012 rohm co., ltd. all rights reserved. ? equivalent circuit ? u, v, w, rnf com pwm fr fg 20
technical note 7/10 bh6717nuv www.rohm.com 2012.03 - rev. a ? 2012 rohm co., ltd. all rights reserved. 300 450 600 750 pd(mw ) 0 25 50 75 100 125 150 ta (
technical note 8/10 bh6717nuv www.rohm.com 2012.03 - rev. a ? 2012 rohm co., ltd. all rights reserved.
technical note 9/10 bh6717nuv www.rohm.com 2012.03 - rev. a ? 2012 rohm co., ltd. all rights reserved.
technical note 10/10 bh6717nuv www.rohm.com 2012.03 - rev. a ? 2012 rohm co., ltd. all rights reserved. (unit : mm) vson010v3030 s 3.00.1 3.00.1 1pin mark 1.0max (0.22) s 0.08 0.02 +0.03 - 0.02 610 51 0.40.1 0.5 0.5 2.00.1 1.20.1 0.25 +0.05 - 0.04 c0.25 ? order quantity needs to be multiple of the minimum quantity. embossed carrier tape tape quantity direction of feed the direction is the 1pin of product is at the upper left when you hold reel on the left hand and you pull out the tape on the right hand 3000pcs e2 () direction of feed reel 1pin
r1120 a www.rohm.com ? 2012 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 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 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, redundancy, 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, 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 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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