BD64550EFV(2009) 데이터 시트보기 (PDF) - ROHM Semiconductor
부품명
상세내역
일치하는 목록
BD64550EFV Datasheet PDF : 5 Pages
| |||
4/4
○Operation Notes
(1) Absolute maximum ratings
Use of the IC in excess of absolute maximum ratings such as the applied voltage or operating temperature range (TOPR) may
result in IC damage. Assumptions should not be made regarding the state of the IC (short mode or open mode) when such
damage is suffered. The implementation of a physical safety measure such as a fuse should be considered when use of the IC
in a special mode where the absolute maximum ratings may be exceeded is anticipated.
(2) Power supply lines
Regenerated current may flow as a result of the motor's back electromotive force. Insert capacitors between the power supply
and ground pins to serve as a route for regenerated current. Determine the capacitance in full consideration of all the
characteristics of the electrolytic capacitor, because the electrolytic capacitor may loose some capacitance at low temperatures.
If the connected power supply does not have sufficient current absorption capacity, regenerative current will cause the voltage
on the power supply line to rise, which combined with the product and its peripheral circuitry may exceed the absolute
maximum ratings. It is recommended to implement a physical safety measure such as the insertion of a voltage clamp diode
between the power supply and GND pins.
(3) Ground potential
Ensure a minimum GND pin potential in all operating conditions.
(4) Setting of heat
Use a thermal design that allows for a sufficient margin in light of the power dissipation (Pd) in actual operating conditions.
This IC exposes its frame of the backside of package. Note that this part is assumed to use after providing heat dissipation
treatment to improve heat dissipation efficiency. Try to occupy as wide as possible with heat dissipation pattern not only on the
board surface but also the backside.
(5) Actions in strong magnetic field
Use caution when using the IC in the presence of a strong magnetic field as doing so may cause the IC to malfunction.
(6) ASO
When using the IC, set the output transistor for the motor so that it does not exceed absolute maximum ratings or ASO.
(7) Thermal shutdown circuit
The IC has a built-in thermal shutdown circuit (TSD circuit). If the chip temperature becomes Tjmax=150℃, and higher,
coil output to the motor and regulator output will be OFF, and reset output will be L. The TSD circuit is designed only to
shut the IC off to prevent runaway thermal operation. It is not designed to protect or indemnify peripheral equipment. Do
not use the TSD function to protect peripheral equipment.
(8) Ground Wiring Pattern
When using both small signal and large current GND patterns, it is recommended to isolate the two ground patterns, placing a
single ground point at the application's reference point so that the pattern wiring resistance and voltage variations caused by
large currents do not cause variations in the small signal ground voltage. Be careful not to change the GND wiring pattern of
any external components, either.
REV. A
Share Link: 