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PDF BD6966FVM Data sheet ( Hoja de datos )
| Número de pieza | BD6966FVM | |
| Descripción | 5V single-phase full wave DC brushless fan motor driver | |
| Fabricantes | ROHM Semiconductor | |
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DC Brushless Motor Drivers for Fans
5V single-phase full wave
DC brushless fan motor driver
BD6966FVM
No.12010EAT12
●Description
This is the summary of application for BD6966FVM that suit for notebook PC cooling fan motor. They employ Bi-CMOS
process and realize low ON resistor, and low power consumption and quiet drive.
●Features
1) Small package (MSOP10)
2) Soft switched drive
3) PWM speed control
4) Low duty start up function and enable/disable selectable
5) Quick start function
6) Stand-by function
7) Constant voltage output for hall element
8) Lock protection and automatic restart circuit without external capacitor
9) Rotating speed pulse signal (FG) output
●Application
For compact 5V fan such as notebook PC cooling fan
●Absolute maximum ratings
Parameter
Symbol
Limit
Unit
Supply voltage
Power dissipation
Operation temperature
Storage temperature
Output voltage
Output current
Vcc
Pd
Topr
Tstg
Vomax
Iomax
7
585*
-40～+105
-55～+150
7
1000**
V
mW
℃
℃
V
mA
FG signal output voltage
Vfg
7
V
FG signal output current
Ifg
10 mA
Hall bias output current
Ihb
10
Junction temperature
Tjmax
150
* Reduce by 4.68mW/℃ over Ta=25ºC(On 70mm×70mm×1.6mm glass epoxy board)
** This value is not to exceed Pd
●Operating conditions
Parameter
Symbol
Operating supply voltage range Vcc
Hall input voltage range
Vh
Limit
1.8～5.5
0.4～Vcc-1.1
mA
℃
Unit
V
V
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
1/12
2012.03 - Rev.A
1 page  
BD6966FVM
Technical Note
●Description of operations
1) Lock protection and automatic restart circuit
Motor rotation is detected by hall signal, and lock detection ON time (Ton) and lock detection OFF time (Toff) are set
by IC internal counter. External part (C or R) is not required. Timing chart is shown in Fig.13.
Idling
H+
OUT1
OUT2
FG
Toff Ton
Output Tr OFF ON
Depends on hall signal
(L in this figure)
Motor Lock
locking detection
Lock
Recovers normal
release operation
Fig.13 Lock protection timing chart
2) Soft switching function (silent drive setting)
Input signal to hall amplifier is amplified to produce an output signal.
When the hall element output signal is small, the gradient of switching of output waveform is gentle; When it is large,
the gradient of switching of output waveform is steep. Gain of 44.5dB (170 times) is provided between input and
output, therefore enter an appropriate hall element output to IC where output waveform swings sufficiently.
(H+)-(H-)
OUT1
Fig.14 Relation between hall element output amplitude and output waveform
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
5/12
2012.03 - Rev.A
5 Page 
BD6966FVM
Technical Note
●Notes for use
1) Absolute maximum ratings
An excess in the absolute maximum rations, such as supply voltage, temperature range of operating conditions, etc.,
can break down the devices, thus making impossible to identify breaking mode, such as a short circuit or an open
circuit. If any over rated values will expect to exceed the absolute maximum ratings, consider adding circuit
protection devices, such as fuses.
2) Connecting the power supply connector backward
Connecting of the power supply in reverse polarity can damage IC. Take precautions when connecting the power
supply lines. An external direction diode can be added.
3) Power supply line
Back electromotive force causes regenerated current to power supply line, therefore take a measure such as placing
a capacitor between power supply and GND for routing regenerated current. And fully ensure that the capacitor
characteristics have no problem before determine a capacitor value. (when applying electrolytic capacitors,
capacitance characteristic values are reduced at low temperatures)
4) GND potential
It is possible that the motor output terminal may deflect below GND terminal because of influence by back
electromotive force of motor. The potential of GND terminal must be minimum potential in all operating conditions,
except that the levels of the motor outputs terminals are under GND level by the back electromotive force of the
motor coil. Also ensure that all terminals except GND and motor output terminals do not fall below GND voltage
including transient characteristics. Malfunction may possibly occur depending on use condition, environment, and
property of individual motor. Please make fully confirmation that no problem is found on operation of IC.
5) Thermal design
Use a thermal design that allows for a sufficient margin in light of the power dissipation(Pd) in actual operating
conditions.
6) Inter-pin shorts and mounting errors
Use caution when positioning the IC for mounting on printed circuit boards. The IC may be damaged if there is any
connection error or if pins are shorted together.
7) Actions in strong electromagnetic field
Use caution when using the IC in the presence of a strong electromagnetic field as doing so may cause the IC to
malfunction.
8) ASO
When using the IC, set the output transistor so that it does not exceed absolute maximum rations or ASO.
9) Thermal shut down circuit
The IC incorporates a built-in thermal shutdown circuit (TSD circuit). Operation temperature is 175ºC (typ.) and has a
hysteresis width of 25ºC (typ.). When IC chip temperature rises and TSD circuit works, the output terminal becomes
an open state. TSD circuit is designed only to shut the IC off to prevent thermal runaway. It is not designed to protect
the IC or guarantee its operation. Do not continue to use the IC after operation this circuit or use the IC in an
environment where the operation of this circuit is assumed.
10) Testing on application boards
When testing the IC on an application board, connecting a capacitor to a pin with low impedance subjects the IC to
stress. Always discharge capacitors after each process or step. Always turn the IC’s power supply off before
connecting it to or removing it from a jig or fixture during the inspection process. Ground the IC during assembly
steps as an antistatic measure. Use similar precaution when transporting or storing the IC.
11) GND wiring pattern
When using both small signal and large current GND patterns, it is recommended to isolate the two ground patterns,
placing a single ground point at the ground potential of application so that the pattern wiring resistance and voltage
variations caused by large currents do not cause variations in the small signal ground voltage. Be careful not to
change the GND wiring pattern of any external components, either.
12) Capacitor between output and GND
When a large capacitor is connected between output and GND, if Vcc is shorted with 0V or GND for some cause, it
is possible that the current charged in the capacitor may flow into the output resulting in destruction. Keep the
capacitor between output and GND below 100uF.
13) IC terminal input
When Vcc voltage is not applied to IC, do not apply voltage to each input terminal. When voltage above Vcc or below
GND is applied to the input terminal, parasitic element is actuated due to the structure of IC. Operation of parasitic
element causes mutual interference between circuits, resulting in malfunction as well as destruction in the last. Do
not use in a manner where parasitic element is actuated.
14) In use
We are sure that the example of application circuit is preferable, but please check the character further more in
application to a part which requires high precision. In using the unit with external circuit constant changed, consider
the variation of externally equipped parts and our IC including not only static character but also transient character
and allow sufficient margin in determining.
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
11/12
2012.03 - Rev.A
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet BD6966FVM.PDF ] | |
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