bd6709fs ROHM Co. Ltd., bd6709fs Datasheet - Page 17

• 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.

Adjust the gain according to
the characteristics of level
amplifier gain setting resistor.
Bias resistor for thermistor.
Set
speed and full torque time in
restarting.
Output
resistor.
wattage because large current
flows.
Speed control is enabled by
thermistor.
P.21,.22
P.22
P.22
P.24
◎BD6721FS
the
PIN No.
current
Pay
minimum
1
2
3
4
5
6
7
8
1) DC input application
The example of an application for rotation speed control by thermistor.
attention
detecting
rotating
Terminal
LAOUT
COSC
OUT1
name
VMIN
GND
LAIN
RNF
VTH
to
GND terminal
Oscillating capacitor connecting terminal
Level amplifier output terminal
(for setting speed control gain)
Level amplifier input terminal
(for setting speed control gain)
Variable speed input terminal
(thermistor connecting terminal)
Minimum rotating speed setting terminal
Motor output terminal 1
Output current detecting resistor connecting terminal
(motor GND terminal)
LAOUT
COSC
OUT1
VMIN
GND
LAIN
RNF
VTH
1
2
3
4
5
6
7
8
Function
-
+
COSC
LEVEL
AMP
SWITCH
SOFT
+
-
PWM
COMP
CONTROL
VREF
DRIVER
LOGIC
M
PRE
Vcc
17/40
PROTECTION
PIN No.
LOCK
10
11
12
13
14
15
16
TSD
9
OUTPUT
SIGNAL
Hall
COMP
Current
Limit
Comp
Terminal
OUT2
VREF
name
Vcc
CS
FG
H+
AL
H-
+
+
-
-
Lock alarm signal output terminal
Motor output terminal 2
Output current detecting terminal
Power supply terminal
Hall input terminal +
Hall input terminal -
Reference voltage terminal
Rotating speed pulse signal output terminal
AL
FG
VREF
H-
H+
Vcc
CS
OUT2
16
15
14
13
12
10
11
9
HALL
Function
Set according to the amplitude
of hall element output and hall
input voltage range.
Take a measure against Vcc
voltage rise due to reverse
connection of power supply.
RNF
low-pass filter.
This is an open collector
output. Connect a pull-up
resistor.
P.37
P.28,29
P.36
P.24
voltage
smoothing