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BD63731EFV Datasheet(Fiches technique) 6 Page - Rohm
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BD63731EFV Datasheet(HTML) 6 Page - Rohm
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• 15 • 001
Thermal Shutdown (TSD)
This IC has a built-in thermal shutdown circuit for thermal protection. When the IC
’s chip temperature rises 175 °C
(Typ) or more, the motor output becomes OPEN. Also, when the temperature returns to 150 °C (Typ) or less, it
automatically returns to normal operation. However, even when TSD is in operation, if heat is continued to be added
externally, heat overdrive can lead to destruction.
Over Current Protection (OCP)
This IC has a built-in over current protection circuit as a provision against destruction when the motor outputs are
shorted each other or VCC-motor output or motor output-GND is shorted. This circuit latches the motor output to
OPEN condition when the regulated current flows for 4
μs (Typ). It returns with power reactivation or a reset by the PS
pin. The over current protection circuit
’s only aim is to prevent the destruction of the IC from irregular situations such
as motor output shorts, and is not meant to be used as protection or security for the set. Therefore, sets should not be
designed to take into account this circuit
’s functions. After OCP operating, if irregular situations continue and the return
by power reactivation or a reset by the PS pin, then OCP operates repeatedly and the IC may generate heat or
otherwise deteriorate. When the L value of the wiring is great due to the wiring being long, the motor outputs are
shorted each other or VCC-motor output or motor output-GND is shorted., if the output pin voltage jumps up and the
absolute maximum values can be exceeded after the over current has flowed, there is a possibility of destruction. Also,
when current which is the output current rating or more and the OCP detection current or less flows, the IC can heat up
to Tjmax=150 °C exceeds and can deteriorate, so current which or more the output rating should not be applied.
Under Voltage Lock Out (UVLO)
This IC has a built-in under voltage lock out function to prevent false operation such as IC output during power supply
under voltage is low. When the applied voltage to the VCC
pin goes 5 V (Typ) or less, the motor output is set to OPEN.
This switching voltage has a 1 V (Typ) hysteresis to prevent false operation by noise etc. Be aware that this circuit
does not operate during power save mode. Also, the electrical angle is reset when he UVLO circuit operates.
Over Voltage Lock Out (OVLO)
This IC has a built-in over voltage lock out function to protect the IC output and the motor during power supply over
voltage. When the applied voltage to the VCC
pin goes 32 V (Typ) or more, the motor output is set to OPEN. This
switching voltage has a 1 V (Typ) hysteresis and a 4
μs (Typ) mask time to prevent false operation by noise etc.
Although this over voltage locked out circuit is built-in, there is a possibility of destruction if the absolute maximum
value for power supply voltage is exceeded. Therefore, the absolute maximum value should not be exceeded. Be
aware that this circuit does not operate during power save mode.
Protects against malfunction when power supply is disconnected (Ghost Supply Prevention Function)
If a control signal
is input when there is no power supplied to this IC, there is a function which prevents a
malfunction where voltage is supplied to power supply of this IC or other IC in the set via the electrostatic destruction
prevention diode from these input pins to the VCC
. Therefore, there is no malfunction of the circuit even when voltage
is supplied to these input pins while there is no power supply.
(Note 1) control signal=CLK, CW_CCW, MODE0, MODE1, MODE2, ENABLE, PS, MTH, VREF
Operation Under Strong Electromagnetic Field
The IC is not designed for using in the presence of strong electromagnetic field. Be sure to confirm that no malfunction
is found when using the IC in a strong electromagnetic field.
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