M54646AP

Rev.1.0, Sep.19.2003, page 7 of 8

CAUTIONS

(1) Be sure to short-circuit VCC1 and VCC2 before use.

(2) When IC total output current changes greatly, e.g. when output current flows intermittently due to thermal

protection operation, supply voltage may fluctuate. Provide power supply and wiring such that even in such a case

amperage will not exceed absolute maximum rating.

(3) Excessive power voltage fluctuations may cause unstable IC operation. To regulate such fluctuations, connect

capacitor between terminals VCC and GND as close to IC terminal as possible. (Refer to application example.)

(4) Thermal protection function

• Thermal protection characteristics may differ depending on wiring layout. Be sure to test IC on circuit board before

use.

After circuit board is replaced, test IC again.

• Circuit boards on which this IC mounted are designed such that impedance between power supply and output

terminal will be kept low; therefore, IC output terminal may be short- circuited internally if excessive surge voltage

is applied accidentally from outside. To prevent circuit board from burning in such a case, take safety measures

such as installation of a fuse.

(5) Flywheel diode

This IC has built in flywheel diode to provide a return current route to motor. To prevent overheating and

malfunction in operational areas where great current and voltage are applied, install a Schottky diode externally. For

details, refer to “Area of Safe Operation” and “Application Example.”