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PDF BH6717NUV Data sheet ( Hoja de datos )
| Número de pieza | BH6717NUV | |
| Descripción | Three-Phase Full-Wave Fan Motor Driver for Note PC | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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DC Brushless Motor Drivers for Cooling Fans
Three-Phase Full-Wave
Fan Motor Driver for Note PC
BH6717NUV
No.12010EAT18
●Description
BH6717NUV is a three-phase sensorless fan motor driver used to cool off notebook PCs. It is controlled by a variable
speed provided through the PWM input signal. Its feature is sensorless drive which doesn’t require a hall device as a
location detection sensor and motor downsizing can be achieved by limiting the number of external components as much
as possible. Furthermore, introducing a direct PWM soft switched 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=25C)
Parameter
Symbol
Ratings
Supply voltage
VCC
−0.3～6.5
Power dissipation
Pd 560 *
Operating temperature Topr -25～+95
Storage temperature
Tstg -55～+125
Output current
Iomax
700 **
FG signal output voltage
VFG
6.5
FG signal output current
IFG
6
Junction temperature
Tjmax
125
* Reduce by 5.6mW/C over 25/C. (On 70mm×70mm×1.6mm glass epoxy board)
** This value is not to exceed Pd.
Unit
V
mW
C
C
mA
V
mA
C
●Operating conditions
Parameter
Symbol
Operating supply voltage range
VCC
*These specifications might change for their improvement etc.
Ratings
1.8 ～ 5.5
Unit
V
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
1/10
2012.03 - Rev.A
1 page  
BH6717NUV
Technical Note
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 the Standby mode becomes effective 1ms (typ.) (Fig.2).
In the Standby mode, the lock protection function is deactivated and the lock protection 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.
PWM
Power saving
function
1ms
normal mode
s tandby m ode
normal mode
Output
ON
OFF ON
Lock protection
function
active
inactive
active
Fig.2
・Speed Control by PWM input
Depending on the Duty value of the input signal on the PWM terminal, the output is controlled by switching
between ON and OFF. The higher Duty value results in the higher motor rotation speed, while the lower Duty
value the lower speed.
6. U,V,W phase and FG output signals
In Fig.3, the timing charts of the output signals from the U, V and W phases as well as the FG terminal is shown.
Assuming that a three-slot tetrode motor is used, two pulse outputs of FG are produced for one motorcycle.
The three phases are excited in the order of U, V and W phases.
U phase
voltage
V phase
voltage
W phase
voltage
FG
Fig.3
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
5/10
2012.03 - Rev.A
5 Page 
Notice
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, 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.
Thank you for your accessing to ROHM product informations.
More detail product informations and catalogs are available, please contact us.
ROHM Customer Support System
http://www.rohm.com/contact/
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
R1120A
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