an44070a Panasonic Corporation of North America, an44070a Datasheet - Page 17

• Manufacturer Part Number: an44070a
• Description: Driver Ic For Dc Motor
• Manufacturer: Panasonic Corporation of North America

AN44070A
1. Perform thermal design work with consideration of a sufficient margin to keep the power dissipation based on supply voltage, load,
2. The protection circuit is incorporated for the purpose of securing safety if the IC malfunctions.
3. Pay utmost attention to the pattern layout in order to prevent the IC from destruction resulting from the short-circuiting of pins.
4. When driving a motor coil or transformer (L) load, the device may be destructed as a result of a negative or excessive voltage
5. Do not make mistakes in the PCB mounting direction. If power is supplied with the pins mounted in the wrong direction, the IC
6. The IC may be destructed by the solder bridge between the pins of semiconductor devices. Fully make a visual check on the PCB
7. The IC is destructed under an abnormal condition, such as the short-circuiting between the output and VM pins, output and ground
8. When using the IC for model expansion or new sets, be sure to make full safety checks including a long-term reliability check on
9. Set the value of the capacitor between the VPUMP and GND pins so that the voltage on the VPUMP pin (Pin17) will not exceed
10. This IC employs a PWM drive method that switches the high-current output of the output transistor. Therefore, the IC is apt to
Usage Notes
(The IC is recommended that junctions are designed below 70 ∼ 80% of Absolute Maximum Rating.)
and ambient temperature conditions.
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.
See page 6 Pin Descriptions for allocations of the pins of the IC.
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.
may be destructed.
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.
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.
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 (Pin13), AOUT2 (Pin12), BOUT1 (Pin6), BOUT2 (Pin5)
(2) BC2 (Pin15), VPUMP (Pin17)
(3) VM1 (Pin16), VM2 (Pin3), VCC(Pin23), S5VOUT(Pin24)
(4) RCSA (Pin10), RCSB (Pin8)
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.
each set.
43 V in any case regardless of whether it is a transient phenomenon or not while the motor standing by is started.
generate noise that may cause the IC to malfunction or have fatal damage. To prevent these problems, the power supply must be
stable enough. Therefore, the capacitance between the S5VOUT and GND pins must be a minimum of 0.1 μF and the one between
the VM and GND pins must be a minimum of 47 μF and as close as possible to the IC so that PWM noise will not cause the IC to
malfunction or have fatal damage.
Ver. AEB
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