Advertisement
14. IC Usage Considerations
14.1. Notes on Handling of ICs
(1) The absolute maximum ratings of a semiconductor device are a set of ratings that must not be
exceeded, even for a moment. Do not exceed any of these ratings.
Exceeding the rating(s) may cause the device breakdown, damage or deterioration, and may
result injury by explosion or combustion
(2) Use an appropriate power supply fuse to ensure that a large current does not continuously flow
in case of over-current and/or IC failure. The IC will fully break down when used under
conditions that exceed its absolute maximum ratings, when the wiring is routed improperly or
when an abnormal pulse noise occurs from the wiring or load, causing a large current to
continuously flow and the breakdown can lead smoke or ignition. To minimize the effects of the
flow of a large current in case of breakdown, appropriate settings, such as Fast-blow fuse
capacity, fusing time and insertion circuit location, are required.
14.2. Points of 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.
Notes on Handling of ICs
(1) Block Diagrams
Some of the functional blocks, circuits, or constants in the block diagram may be omitted or simplified
for explanatory purposes.
(2) Equivalent Circuits
The equivalent circuit diagrams may be simplified or some parts of them may be omitted for
explanatory purposes.
(3) Timing Charts
Timing charts may be simplified for explanatory purposes.
(4) Absolute Maximum
The absolute maximum ratings of a semiconductor device are a set of ratings that must not be
exceeded, even for a moment.
(5) Do not insert devices in the wrong orientation or incorrectly.
Make sure that the positive and negative terminals of power supplies are connected properly.
Otherwise, the current or power consumption may exceed the absolute maximum rating, and
exceeding the rating(s) may cause the device breakdown, damage or deterioration, and may result
injury by explosion or combustion.
In addition, do not use any device that is applied the current with inserting in the wrong orientation or
incorrectly even just one time.
48 / 49
TB9051FTG
Ver.1.1 2019-03-14
Advertisement
