bd6709fs ROHM Co. Ltd., bd6709fs Datasheet - Page 19

• 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.

◎BD6722FS
This terminal can set the
minimum rotational speed and
soft start time.
Output
resistor.
wattage because large current
is present.
Take a measure against Vcc
voltage rise due to reverse
connection of power supply
and back electromotive force.
Speed control depending on
ambient
enabled by thermistor.
PIN No.
P.21,22
P.30
P.24
P.36
1
2
3
4
5
6
7
8
1) DC input application
The example of an application for rotation speed control by thermistor.
current
Pay
temperature
Terminal
COSC
name
VMIN
GND
RNF
VTH
A1H
A1L
attention
Vcc
detecting
100 ｋΩ
～１ M Ω
GND terminal
Oscillating capacitor connecting terminal
Minimum rotating speed setting terminal
Variable speed input terminal
(thermistor connecting terminal)
Power supply terminal
High side output terminal (OUT1)
Low side output terminal (OUT1)
Output current detecting resistor connecting terminal
(motor GND terminal)
to
is
330pF
～ 1000pF
1 μ F
～ 10 μ F
Vcc line
COSC
VMIN
GND
VTH
RNF
0.3 Ω
～ 0.5 Ω
A1H
A1L
Vcc
Function
1
2
3
4
5
6
7
8
POW
DRIVER
COSC
PRE
PWM COMP
+
-
POW
SWITCH
START
SOFT
SOFT
VREF line
CONTROL
19/40
LOGIC
VREF
VM line
PIN No.
PROTECTION
10
11
12
13
14
15
16
9
LOCK
TSD
Current Limit
Hall COMP
Comp
OUTPUT
SIGNAL
Terminal
VREF
name
A2H
A2L
CS
H+
FG
AL
H-
+
-
+
-
Low side output terminal (OUT2)
High side output terminal (OUT2)
Current limiting input terminal
Hall input terminal +
Hall input terminal -
Reference voltage terminal
Rotating speed pulse signal output terminal
Lock alarm signal output terminal
AL
FG
VREF
H-
H+
CS
A2H
A2L
16
15
14
13
12
10
50 Ω
～ 1k Ω
11
9
0 Ω
～ 2k Ω
100pF
～ 0.1 μ F
HALL
1k Ω
～ 200k Ω
Set according to the amplitude
of hall element output and hall
input voltage range.
RNF
low-pass filter.
Power
output can be suppressed by
inserting resistance between
PMOS Gate-H output. Note
Wattage of the resistance.
Function
This is an open collector
output. Connect a pull-up
resistor.
Output power Tr is equipped
externally.
application is also allowed.
P.31
P.24
P.37
P.28,29
P.27
voltage
consumption
High
smoothing
voltage
of
H