Data Sheet

TB67S279FTG
2017-09-15
26
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 device so that heat is
appropriately radiated, not to exceed the specified junction temperature (T
j
) 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.
(4) Back-EMF
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 absolute maximum ratings. To avoid this problem,
take the effect of back-EMF into consideration in system design.