TA7291P/S/SG/F/FG

2007-06-13

15

Points to remember on handling of ICs

(1) Over current Protection Circuit

Over current protection circuits (referred to as current limiter circuits) do not necessarily protect

ICs under all circumstances. If the Over current protection circuits operate against the over current,

clear the over current status immediately.

Depending on the method of use and usage conditions, such as exceeding absolute maximum ratings

can cause the over current protection circuit to not operate properly or IC breakdown before

operation. In addition, depending on the method of use and usage conditions, if over current

continues to flow for a long time after operation, the IC may generate heat resulting in breakdown.

(2) Thermal Shutdown Circuit

Thermal shutdown circuits do not necessarily protect ICs under all circumstances. If the thermal

shutdown circuits operate against the over temperature, clear the heat generation status

immediately.

Depending on the method of use and usage conditions, such as exceeding absolute maximum ratings

can cause the thermal shutdown circuit to not operate properly or IC breakdown before operation.

(3) Heat Radiation Design

In using an IC with large current flow such as power amp, regulator or driver, please design the

at any time and condition. These ICs generate heat even during normal use. An inadequate IC heat

radiation design can lead to decrease in IC life, deterioration of IC characteristics or IC breakdown.

In addition, please design the device taking into considerate the effect of IC heat radiation with

peripheral components.

When a motor rotates in the reverse direction, stops or slows down abruptly, a current flow back to the motor’s

power supply due to the effect of back-EMF. If the current sink capability of the power supply is small, the

device’s motor power supply and output pins might be exposed to conditions beyond maximum ratings. To avoid

this problem, take the effect of back-EMF into consideration in system design.