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REV. B

○Operation Notes

(1)

Absolute maximum ratings

An excess in the absolute maximum ratings, such as supply voltage, temperature range of operating

conditions, etc., can break down the devices, thus making impossible to identify breaking mode, such as a

short circuit or an open circuit. If any over rated values will expect to exceed the absolute maximum ratings,

consider adding circuit protection devices, such as fuses.

(2)

Power supply lines

As return of current regenerated by back EMF of motor happens, take steps such as putting capacitor

between power supply and GND as an electric pathway for the regenerated current. Be sure that there is no

problem with each property such as emptied capacity at lower temperature regarding electrolytic capacitor

to decide capacity value. 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)

GND potential

The potential of GND pin must be minimum potential in all operating conditions.

(4)

Thermal design

Use a thermal design that allows for a sufficient margin in light of the power dissipation (Pd) in actual

operating conditions. This IC is equipped with FIN heat dissipation terminals, but dissipation efficiency can

be improved by applying heat dissipation treatment in this area. It is important to consider actual usage

conditions and to take as large a dissipation pattern as possible.

(5)

Actions in strong electromagnetic field

Use caution when using the IC in the presence of a strong electromagnetic field as doing so may cause the

IC to malfunction.

(6)

ASO

When using the IC, set the output transistor 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 will be open. 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 ground potential of application 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.

(9)

TEST pin

Be sure to connect TEST pin to GND.