bd6709fs ROHM Co. Ltd., bd6709fs Datasheet - Page 14

• 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
PWM input
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.
PWM signal → DC voltage
conversion circuit.
Adjust the value of resistance
and the capacitor according to
the
frequency of the input signal.
The example of an application for controlling the rotational speed by DUTY of external PWM signal. The minimum
rotational speed cannot be set.
Set resistance in consideration
of the input voltage of the
VMIN and VTH terminal.
amplitude
P.23
PWM input
and
the
LAOUT
LAOUT
COSC
COSC
OUT1
OUT1
VMIN
VMIN
GND
LAIN
GND
LAIN
RNF
VTH
VTH
RNF
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
OSC
OSC
REG
REG
14/40
-
+
+
-
Auto Restart
-
+
Auto Restart
-
+
Lock Detect
Lock Detect
TSD
TSD
Pre Driver
Pre Driver
Control
Control
M
M
REF
REF
-
+
-
+
-
+
-
+
FG
VREF
H-
H+
CL
Vcc
CS
OUT2
FG
VREF
H-
H+
CL
Vcc
CS
OUT2
16
15
14
13
12
10
11
16
15
14
13
12
11
10
9
9
HALL
HALL
Vcc
Vcc