an44060a Panasonic Corporation of North America, an44060a Datasheet - Page 23

• Manufacturer Part Number: an44060a
• Description: Ic For Stepping Motor Drives
• Manufacturer: Panasonic Corporation of North America

AN44060A
[Precautions for this IC]
Usage Notes
Perform thermal design work with consideration of a sufficient margin to keep the power dissipation based on supply voltage, load,
and ambient temperature conditions.
The protection circuit is incorporated for the purpose of securing safety if the IC malfunctions.
Therefore, design the protection circuit so that the protection circuit will not operate under normal operating conditions. The
temperature protection circuit, in particular, may be destructed before the temperature protection circuit operates if the area of
safety operation of the device or the maximum rating is exceeded instantaneously due to the short-circuiting between the output pin
and VM pin or a ground fault caused by the output pin and ground pin.
Pay utmost attention to the pattern layout in order to prevent the IC from destruction resulting from the short-circuiting of pins. See
page 17 Pin Descriptions for allocations of the pins of the IC.
When driving a motor coil or transformer (L) load, the device may be destructed as a result of a negative or excessive voltage
generated at the time of turning the load on and off. Unless otherwise provided in the specifications, do not apply any negative or
excessive voltage.
Do not make mistakes in the PCB mounting direction. If power is supplied with the pins mounted in the wrong direction, the IC
may be destructed.
The IC may be destructed by the solder bridge between the pins of semiconductor devices. Fully make a visual check on the PCB
before supplying power.
Furthermore, the IC may be destructed if conductive foreign matters like solder chips are stuck to the IC during transportation after
PCB mounting.
Therefore, conduct full technical verification of the mounting quality of the IC.
The IC is destructed under an abnormal condition, such as the short-circuiting between the output and VM pins, output and ground
pins, or output pins (i.e., load short-circuiting), in which case smoke may be generated. Pay utmost attention to the use of the IC.
The higher the current capacity of power supply is, the higher the possibility of the above destruction or smoke generation.
Therefore, it is recommended to take safety countermeasures, such as the use of a fuse.
When using the IC for model expansion or new sets, be sure to make full safety checks including a long-term reliability check on
each set.
Pay special attention to the following pins so that they are not short-circuited with the VM pin, ground pin, other output pin, or
current detection pin.
(1) AOUT1 (pin 17), AOUT2 (pin 15), BOUT1 (pin 14), BOUT2 (pin 12)
(2) BC2 (pin 20), VPUMP (pin 21)
(3) VM1 (pin 8), VM2 (pin 22), VREG (pin 25)
(4) RCSA (pin 16), RCSB (pin 13)
SFA00002AEB
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