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REV. A

CAUTIONS ON USE

(1)

Setting the Standby terminal (pin 1) to 0.5V or less allows the circuit to enter the standby mode.

Under conditions of normal use, the pin 1 should be pulled-up to 2.0V or above.

(2)

When Vcc (pin 8) has dropped to 2.5V (typ.) or less, the output current will be muted and, when

recovering to 2.7V (typ.), the driver part circuit will be initiated.

(3)

When the voltage applied on the Bias terminal (pin 2) has dropped to 0.7V (typ.) or less, the mute

function will be activated.

Under conditions of normal use, it should be set to 1.0V or above.

(4)

Thermal shutdown power supply voltage drop, or bias terminal voltage drop will activate the mute

function for all drivers, where only the driver part can be muted.

(5)

Connecting a capacitive load to the OP-AMP output results in a phase margin reduction of the amp and

may cause an oscillation or a peak.

When connecting a capacitive load, a resistance must be

inserted in series between the output and the capacitive load.

And after careful consideration of the

frequency characteristics, the device should be used within the range where no problem is found in

actual use.

(6)

Short-circuits between output pin-VCC, output pin-GND, or output terminals (load short) must be

avoided.

Make sure that the ICs are installed on the board in proper directions.

Mounting the ICs in

improper directions may damage them or produce smoke.

(7)

About absolute maximum ratings

Exceeding the absolute maximum ratings, such as the applied voltage or the operating temperature

range, may cause permanent device damage.

As these cases cannot be limited to the broken short

mode or the open mode, if a special mode where the absolute maximum ratings may be exceeded is

assumed, it is recommended to take mechanical safety measures such as attaching fuses.

(8)

About power supply lines

As a measure against the back current regenerated by a counter electromotive force of the motor, a

capacitor to be used as a regenerated-current path can be installed between the power supply and

GND and its capacitance value should be determined after careful check that any problems, for

example, a leak capacitance of the electrolytic capacitor at low temperature, are not found in various

characteristics.

(9)

About GND potential

The electric potential of the GND terminal must be kept lowest in the circuitry at any operation states.

(10) About thermal design

With consideration of the power dissipation (Pd) under conditions of actual use, a thermal design

provided with an enough margin should be done.

(11) About operations in a strong electric field

When used in a strong electric field, note that a malfunction may occur.

(12) ASO

When using this IC, the output Tr must be set not to exceed the values specified in the absolute

maximum ratings and ASO.

(13) Thermal shutdown circuit

This IC incorporates a thermal shutdown circuit (TSD circuit).

When the chip temperature reaches the

value shown below, the coil output to the motor will be set to open.

The thermal shutdown circuit is designed only to shut off the IC from a thermal runaway and not

intended to protect or guarantee the entire IC functions.

Therefore, users cannot assume that the TSD circuit once activated can be used continuously in the

subsequent operations.

TSD ON Temperature [

°C] (typ.)

Hysteresis Temperature [

°C] (typ.)

160

25

(14) About earth wiring patterns

When a small signal GND and a large current GND are provided, it is recommended that the large

current GND pattern and the small signal GND pattern should be separated and grounded at a single

point of the reference point of the set in order to prevent the voltage of the small signal GND from being

affected by a voltage change caused by the resistance of the pattern wiring and the large current.

Make sure that the GND wiring patterns of the external components will not change, too.