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BD6968FVM 데이터시트 PDF




ROHM Semiconductor에서 제조한 전자 부품 BD6968FVM은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


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부품번호 BD6968FVM 기능
기능 Standard Single-phase Full wave Fan motor driver
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BD6968FVM 데이터시트, 핀배열, 회로
Datasheet
DC Brushless Fan Motor Driver
Standard Single-phase Full wave
Fan motor driver
BD6968FVM
Description
This is the summary of application for BD6968FVM. BD6968FVM can drive FAN motor silently by BTL soft switching, and it
can control rotational speed by direct PWM and DC voltage speed control.
Features
Small package (MSOP10)
BTL soft switching drive
PWM speed control
Direct PWM and DC voltage control available
Low duty start up function
Quick start function
Constant voltage output for hall element
Lock protection and auto restart
(without external capacitor)
Lock alarm signal (AL) outputt
Applications
PC, PC peripheral component
(Power supply, VGA card, case FAN etc.)
BD player, Projector etc.
Package(s)
MSOP10
W(Typ.) x D(Typ.) x H(Max.)
2.90mm x 4.00mm x 0.90mm
MSOP10
Absolute maximum ratings
Parameter
Symbol
Limit
Supply voltage
Vcc 15
Power dissipation
Pd 585*
Operating temperature
Topr
-40 to +105
Storage temperature
Tstg -55 to +150
Output voltage
Vomax
15
Output current
Iomax
800**
Hall input terminal voltage
Vhall
7
PWM terminal voltage
Vpwm
7
AL signal output voltage
Val
15
AL signal output current
Ial
10
HB output current Ihb 10
REF output current
Iref
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
Operating supply voltage range
Hall input voltage range
Symbol
Vcc
Vh
Limit
3.3 to 14
0.4 to Vcc/3
Unit
V
mW
V
mA
V
V
V
mA
mA
mA
Unit
V
V
Product structureSilicon monolithic integrated circuit This product is not designed protection against radioactive rays
.www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ2211114001
1/12
TSZ02201-0H1H0B100050-1-2
21.Mar.2013 Rev.002




BD6968FVM pdf, 반도체, 판매, 대치품
BD6968FVM
Datasheet
Block diagram, application circuit, and pin assignment (Constant etc are for reference)
1)Direct PWM speed control
FAN speed is controlled by FAN controller PWM output. IC output PWM duty is changed directly by input PWM signal.
H level input is motor active, L level input is motor stop.
GND
1
Incorporates soft switching
function. Adjust at an
optimum value because
gradient of switching of
output waveform depends on
hall element output.
P.6
H ALL
OUT2
2
H+
3
HB
4
0Ω to
500Ω
H-
5
OSC : Internal reference oscillation circuit
TSD :Thermal shut down(heat rejection circuit)
M
Lock
Protection
+
-
TSD
Ha ll
Bias
+
OSC -
-
+
Co ntrol
+
-
OUT1
10
Vcc
9
REF
8
0.1uF
to 1 u F
PWM
7
AL
6
If controller output is open drain
output, connect pull-up resistor to
REF terminal.
Take a measure against Vcc
voltage rise due to reverse
connection of power supply
and back electromotive
force.
P.9
FAN rotational speed
is controlled by input
PWM signal directly.
P.7
REF
8
PWM
7
1kΩ
to 100kΩ
2)DC voltage speed control
Output PWM duty is varied by input voltage. When input voltage level is low, output PWM duty is low. The voltage
range of output duty changes is between OSC L voltage and OSC H voltage. When the input voltage is around OSC L
(about 0.5V), rotational speed of the motor may fluctuate because of the low duty start-up function operates repeatedly,.
The recommend voltage is higher than 0.7V.
M
GND
1
OUT2
2
H ALL
0Ω to
500Ω
H+
3
HB
4
H-
5
Lock
Protection
+
-
TSD
Ha ll
Bias
+
OSC -
-
+
Co ntrol
+
-
OUT1
10
Vcc
9
REF
8
PWM
7
0.1uF
to 1uF
0. 01 u F
to 0.1uF
FAN rotational speed
is controlled by PWM
terminal DC voltage.
P.7
AL
6
This is an open drain
output. Connect a pull
up resistor.
P.10
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
4/12
TSZ02201-0H1H0B100050-1-2
21.Mar.2013 Rev.002

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BD6968FVM 전자부품, 판매, 대치품
BD6968FVM
Datasheet
4) Speed control
4-1) Direct PWM control
Rotation speed of motor can be changed by controlling ON/OFF of the upper output depending on duty of the
signal input to PWM terminal.
H+
PWM
OUT1
OUT2
Fig.17 Timing chart in PWM control
When the voltage input to PWM terminal applies H logic : normal operation
L logic : H side output is off
4-2) DC voltage speed control
Output ON duty is controlled by the input voltage to PWM terminal, comparing with internal triangular wave (OSC).
PWM terminal voltage become higher, output ON duty become wide. Timing chart is shown in Fig.18.
PWM voltage > OSC voltage : High side output ON
PWM voltage < OSC voltage : High side output OFF
OSC
PWM
OUT
OSCH voltage
OSCL voltage
Output ON duty
Lo w
Output ON duty
High
Fig.18 DC input speed control mode
Setting example 1. Output ON duty 60% on Vcc=5V.
PWM setting voltage equation:
Setting voltage = Voscl + { ( Vosch - Voscl ) × ( Target Duty ) / 100 } + 0.2(*1)
= 0.5 + { ( 2.5 - 0.5 ) × 60 / 100 } + 0.2 = 1.9 [V]
(*1 The constant of delay inside IC)
4-3) Rotational speed adjusting application
OSC H and OSC L voltage is generated by dividing resistance of internal power supply (REF terminal), and the ratio
of those voltage are designed to be hard to fluctuate.
When the input voltage at PWM terminal is constant, the affection to change output ON duty by fluctuation of OSC
H and OSC L voltage is large. However, by setting that voltage input via PWM terminal is generated by dividing
resistance of REF terminal voltage, application can be made hard to be affected by voltage fluctuation of triangle
wave. For an application which requires strict precision, determine a value with sufficient margin after full
consideration of external constant is taken.
Notice:If the resistors value is too large, output ON duty is affected with a bias current to PWM. The recommend
value is less than 100kohm.
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
7/12
TSZ02201-0H1H0B100050-1-2
21.Mar.2013 Rev.002

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관련 데이터시트

부품번호상세설명 및 기능제조사
BD6968FVM

Standard Single-phase Full wave Fan motor driver

ROHM Semiconductor
ROHM Semiconductor

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