bd6709fs ROHM Co. Ltd., bd6709fs Datasheet - Page 16

• 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.

2) Pulse input application 1
3) Pulse input application 2
The example of an application for converting external PWM signal into the DC voltage, and controlling the rotational
speed. Minimum rotational speed can be set.
The example of an application for controlling the rotational speed by DUTY of external PWM signal. The minimum
rotational speed cannot be set.
PWM input
PWM signal → DC voltage
conversion circuit.
Adjust the value of resistance
and the capacitor according to
the
frequency of the input signal.
amplitude
Set resistance in consideration
of the input voltage of the
VMIN and VTH terminal.
PWM input
P.23
and
the
COSC
COSC
VREF
VREF
VMIN
VMIN
VTH
CL
SEL
CL
SEL
VTH
N.C.
N.C.
12
13
CS
14
15
16
17
18
19
20
12
13
CS
14
15
16
17
18
19
20
FG
11
FG
11
AL
AL
REG
REG
OSC
REF
REF
OSC
+
+
-
-
-
+
-
+
16/40
+
-
+
-
Restart
Restart
Detect
Detect
Lock
Lock
Auto
Auto
Control
Control
TSD
TSD
-
+
-
+
-
+
-
+
REG
REG
Bias
Hall
Bias
Hall
A1L
A1L
GND
A2H
GND
A1H
A2L
Vcc
A2H
A1H
A2L
Vcc
CR
CR
HB
H+
HB
H+
10
10
H-
H-
8
7
5
4
2
1
7
4
1
9
6
3
9
8
6
5
3
2
HALL
HALL