BH6717NUV Datasheet PDF - ROHM Semiconductor
| Part Number | BH6717NUV | |
| Description | Three-Phase Full-Wave Fan Motor Driver for Note PC | |
| Manufacturers | ROHM Semiconductor | |
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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
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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
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for BH6717NUV electronic component. |
| Information | Total 11 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ BH6717NUV.PDF Datasheet ] | |
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