BD6989FVM-TR Datasheet, PDF (11/17 Pages) Rohm – Low-voltage Single-phase Full-wave DC Brushless Fan Motor Drivers

4) PWM input ＜BD6989FVM＞
Rotation speed of motor can be changed by controlling ON/OFF of the upper output depending on duty of the signal
input to PWM terminal.
H+
PWM
OUT1
OUT2
FG
Fig.30 Timing chart in PWM control
When the voltage input to PWM terminal applies H logic : normal operation
L logic : H side output is off
When PWM terminal is open, H logic is applied.
PWM terminal has hysteresis of 400mV (typ.).
●Equivalent circuit
Resistance is a typical value.
◎BD6989FVM
1) Hall input terminal, Motor output terminal
Vcc
500Ω
H+
H-
500Ω
2)PWM signal input terminal
Vcc
90kΩ
PWM
10kΩ
150kΩ
150kΩ
Vcc
1kΩ
1kΩ
GND
OUT1
OUT2
◎BH6799FVM/BH6789FVM/ BH6766FVM
1) Hall input terminal, Motor output terminal
Vcc
500Ω
H+
H-
500Ω
1kΩ
1kΩ
150kΩ
150kΩ
Vcc
OUT1
GND
OUT2
11/16
3)FG output terminal
FG
2) Hall bias terminal
Vcc
HB
3) FG output terminal or
AL output terminal
FG
or
AL