bd6709fs ROHM Co. Ltd., bd6709fs Datasheet - Page 15

• Manufacturer Part Number: bd6709fs
• Description: Dc Brushless Motor Drivers For Cooling Fans Speed Controllable Single-phase Full-wave Dc Brushless Fan Motor Drivers
• Manufacturer: ROHM Co. Ltd.

Current limit setting resistor.
Use a larger resistor in order to
reduce
from VREF.
Speed control depending on
ambient
enabled by thermistor.
Minimum rotating speed and
full
restarting can be set.
RNF
low-pass filter.
This is an open collector
output. Connect a pull-up
resistor.
P.21,22
P.37
P.24
P.22
P.24
◎BD6718FV
torque
PIN No.
voltage
power
REG：Internal reference voltage OSC：Oscillation circuit REF：Reference voltage generating circuit
TSD：Thermal shutdown(heat rejection circuit)
10
1
2
3
4
5
6
7
8
9
1) DC input application
temperature
The example of an application for rotation speed control by thermistor.
time
consumption
smoothing
Terminal
name
GND
A1H
A2H
A1L
A2L
Vcc
during
CR
H+
HB
H-
is
100pF
～0.1μF
5kΩ
～200kΩ
100Ω
～200kΩ
330pF
～1000pF
5kΩ
～200kΩ
1kΩ
～200kΩ
Hall input terminal +
Hall bias terminal
Hall input terminal -
Charging and discharging pulse circuit capacitor and
resistor connecting terminal
Power supply terminal
Low side output terminal (OUT1)
Low side output terminal (OUT2)
High side output terminal (OUT1)
High side output terminal (OUT2)
GND terminal
～10μF
Function
COSC
VREF
VMIN
N.C.
CL
SEL
VTH
12
13
CS
14
15
16
17
18
19
20
FG
11
AL
REG
OSC
REF
+
-
-
+
+
-
Restart
Detect
Lock
Auto
Control
TSD
15/40
PIN No.
Vcc line
15
17
19
11
12
13
14
16
18
20
-
+
-
+
REG
Terminal
Bias
Hall
COSC
VREF
name
VMIN
VTH
N.C.
SEL
FG
CS
AL
CL
GND
A1L
A1H
A2L
Vcc
A2H
CR
HB
H+
10
H-
7
4
1
9
8
6
5
3
2
Current limiting input terminal
Lock detection ON:OFF ratio selecting terminal
Variable speed input terminal
(thermistor connecting terminal)
Rotating speed pulse signal output terminal
Lock alarm signal output terminal
Output current detecting terminal
Oscillating capacitor connecting terminal
Minimum rotating speed setting terminal
Reference voltage terminal
HALL
VM line
～5Ω
10kΩ
～200kΩ
～0.1μF
50Ω
～1kΩ
Function
Output power Tr is equipped
externally.
application is also allowed.
Take a measure against Vcc
voltage rise due to reverse
connection of power supply
and back electromotive force.
Output
resistor.
wattage because large current
is present.
Set according to the amplitude
of hall element output and hall
input voltage range.
Simultaneous ON prevention
time can be set.
P.36
P.27
P.24
P.26
P.28
current
Pay
High
attention
detecting
voltage
to