BA5912BFP データシートの表示（PDF） - ROHM Semiconductor

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BA5912BFP

Power Driver For CD-ROM

ROHM Semiconductor 

4/5

{ CAUTIONS ON USE

(1) When the mute terminal voltage (at pin 2 and pin 13) is set to open or dropped to 0.5V (typ.) or less,

the output current (CH1, CH2) can be muted individually. Under conditions of normal use, the pin 2

and pin 13 should be pulled-up to 2.0V or above. Setting both mute terminals (pin 2 and pin 13) to

open, or 0.5V or less will automatically enter the standby mode.

(2) On the Bias terminal (pin 20), the applied voltage of 0.7V (typ.) or less will activate a mute function.

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

(3) When the power supply voltage drops to 3.5V (typ.) or less, the internal circuit will turn OFF and, when

recovering to 4.0V (Typ.) or above, the internal circuit will startup.

(4) Thermal shutdown (TSD), mute ON, bias terminal voltage drop, or power supply voltage drop will

activate the mute function, where only the driver part can be muted. While muting, the voltage at the

output terminal will equal to the internal bias voltage.

(5) When Pre Vcc=Pow Vcc, the Vref switching terminal must be set to open or 0.5V or less (internal bias

voltage=(Pow VCC - VF)/2); or, when Pre Vcc>Pow Vcc+VF, the Vref switching terminal must be pulled

up to 2.0V or above (internal bias voltage=Pow VCC/2).

(6) Even though a radiating fin is connected to the GND inside of the package, it must be connected to the

external GND.

(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.)

175

Hysteresis Temperature

[°C] (typ.)

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.

REV. A

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