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부품번호 | BH6766FVM 기능 |
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기능 | 5V Single-phase Full wave Fan motor driver | ||
제조업체 | ROHM Semiconductor | ||
로고 | |||
전체 13 페이지수
Datasheet
DC Brushless Fan Motor Driver
5V Single-phase Full wave
Fan motor driver
BH6766FVM
●Description
This is the summary of application for BH6766FVM that suit for notebook PC cooling fan motor. They employ Bi-CMOS
process and realize low ON resistance, low power consumption and quiet drive.
●Features
■ Compact package (MSOP8)
■ BTL soft switching drive
■ Constant voltage output for hall element
■ Rotating speed pulse signal (FG) output
●Package(s)
MSOP8
W(Typ.) x D(Typ.) x H(Max.)
2.90mm x 4.00mm x 0.90mm
●Application
■ Compact 5V fan such as notebook PC cooling fan
●Absolute maximum ratings
Parameter
Symbol
Limit
Supply voltage
Vcc 7
Power dissipation
Pd 585*
Operating temperature
Topr
-40 to +105
Storage temperature
Tstg -55 to +150
Output current
Iomax
630**
FG signal output voltage
Vfg
7
FG signal output current
Ifg
5
Junction temperature
Tjmax
150
* Reduce by 4.68mW/℃ over Ta=25ºC(70.0mm×70.0mm×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
2.0 to 6.0
0.4 to Vcc-1.1
MSOP8
Unit
V
mW
℃
℃
mA
V
mA
℃
Unit
V
V
○Product structure:Silicon monolithic integrated circuit ○This product is not designed protection against radioactive rays
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・14・001
1/9
TSZ02201-0H1H0B100100-1-2
11.Jul.2012 Rev.001
BH6766FVM
Datasheet
●Description of operations
1) 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. Enter an appropriate hall element output to IC where output
waveform swings sufficiently.
(H+)-(H-)
OUT1
Fig.7 Relation between hall element output amplitude and output waveform
2) Hall input setting
Hall input voltage range is shown in operating conditions.
Vcc
Vcc-1.1V
0.4V
GND
Fig.8 Hall input voltage range
Adjust the value of hall element bias resistor R1 in Fig.9 so that the input voltage of a hall amplifier is input in "hall
input voltage range" including signal amplitude.
○Reducing the noise of hall signal
Hall element may be affected by Vcc noise depending on the wiring pattern of board. In this case, place a
capacitor like C1 in Fig.9. In addition, when wiring from the hall element output to IC hall input is long, noise may
be loaded on wiring. In this case, place a capacitor like C2 in Fig.9.
H- H+ HB
C2
RH C1
R1
bias current
= Vhb / (RH+R1)
Fig.9 Application near of hall signal
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
4/9
TSZ02201-0H1H0B100100-1-2
11.Jul.2012 Rev.001
4페이지 BH6766FVM
Datasheet
3) Problem of GND line PWM switching
Do not perform PWM switching of GND line because the potential of GND terminal cannot be kept at the minimum.
Vcc
Motor
Driver
M
Controller
GND
PWM input
Prohibited
Fig.13 GND Line PWM switching prohibited
4) FG output
FG output is an open drain and requires pull-up resistor.
The IC can be protected by adding resistor R1. An excess of absolute maximum rating, when FG output terminal is
directly connected to power supply, could damage the IC.
Vcc
Pull-up
resistor
FG
Protection Connector
Resistor R1 of board
Fig.14 Protection of FG terminal
●Thermal derating curve
Thermal derating curve indicates power that can be consumed by IC with reference to ambient temperature. Power that
can be consumed by IC begins to attenuate at certain ambient temperature. This gradient is determined by thermal
resistance θja.
Thermal resistance θja depends on chip size, power consumption, package ambient temperature, packaging condition,
wind velocity, etc., even when the same package is used. Thermal derating curve indicates a reference value measured
at a specified condition. Fig.15 shows a thermal derating curve (Value when mounting FR4 glass epoxy board 70 [mm] x
70 [mm] x 1.6 [mm] (copper foil area below 3 [%]))
Pd(mW)
700
600
585
500
400
300
200
100
0 25 50 75 100 105 125 150 Ta(℃)
* Reduce by 4.68 mW/°C over 25°C.
(70.0mm×70.0mm×1.6mm glass epoxy board)
Fig.15 Thermal derating curve
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
7/9
TSZ02201-0H1H0B100100-1-2
11.Jul.2012 Rev.001
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부품번호 | 상세설명 및 기능 | 제조사 |
BH6766FVM | 5V Single-phase Full wave Fan motor driver | ROHM Semiconductor |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |