LV8162TT Datasheet, PDF (5/7 Pages) Sanyo Semicon Device – Fan Motor Driver Single-Phase Full-Wave Driver

LV8162TT
*4 [PWM pin]
Speed control signal input pin.
The PWM pin is pulled up with a 500kΩ resistor inside the IC.
The 500kΩ is used for setting full speed when the PWM pin is open, and if speed control is to be performed by open
collector (open drain) input, it is necessary to pull up the pin using a resistor of an appropriate value.
If speed control is performed using a push-pull input, a pull-up resistor is not required.
When the speed control is performed using the open collector input above, or when push-pull input is used and no
pull-up resistor is used, the IC can be used without a sequence (power supply and PWM input can be turned on in any
order).
It is recommended that a resistor of 1kΩ or more is connected in series to protect the pin against misconnection such as
ground open and reverse connection.
*5 [FG pin]
Rotatinal speed detection pin.
This is open drain output that can detect the rotational speed by the FG output in response to the ohase switching signal.
This pin is held off when in standby mode.
Keep this pin open when it is not to be used.
It is recommended that a resistor of 1kΩ or more is connected in series to protect the pin against misconnection such as
ground open and reverse connection.
*6 [RD pin]
Lock detection pin.
This is open drain output that is low during rotation, off when lockup is detected, and low when in standby mode.
Keep this pin open when it is not to be used.
It is recommended that a resistor of 1kΩ or more is connected in series to protect the pin against misconnection such as
ground open and reverse connection.
*7 [Low current consumption during standby]
The fan motor controlled using this IC can be set to a current consumption of 10µA (room temperature, typ.) when in
standby mode. However, note that it will not become 10µA under any of the following conditions.
• When the Hall element bias current is fed from the power supply
→ The current flowing to the Hall element is increased
• When connecting a pull-up resistor to the PWM pin.
→ Because the PWM pin must be set to low when in standby mode, the current flowing to the pull-up resistor is
increased.
• When using an RD pin.
→ Because the RD pin is held low when in standby mode, the current flowing to the pull-up resistor is increased.
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