ta8440h TOSHIBA Semiconductor CORPORATION, ta8440h Datasheet - Page 10

• Manufacturer Part Number: ta8440h
• Description: Full-bridge Driver H-switch For Dc Motor
• Manufacturer: TOSHIBA Semiconductor CORPORATION

Points to remember on handling of ICs
(1) Thermal Shutdown Circuit
(2) Heat Radiation Design
(3)
Back-EMF
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.
In using an IC with large current flow such as power amp, regulator or driver, please design the
device so that heat is appropriately radiated, not to exceed the specified junction temperature (T
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.
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TA8440H/HQ
2006-3-2
J
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