Data Sheet

TB67S249FTG
2017-08-18
25
Notes on Contents
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. Application Circuits
The application circuits shown in this document are provided for reference purposes only. Thorough evaluation is
required, especially at the mass production design stage.
Providing these application circuit examples does not grant a license for industrial property rights.
IC Usage Considerations
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 fuse capacity, fusing time and insertion circuit
location, are required.
[3] If your design includes an inductive load such as a motor coil, incorporate a protection circuit into the design to prevent
device malfunction or breakdown caused by the current resulting from the inrush current at power ON or the negative
current resulting from the back electromotive force at power OFF. IC breakdown may cause injury, smoke or ignition.
Use a stable power supply with ICs with built-in protection functions. If the power supply is unstable, the protection
function may not operate, causing IC breakdown. IC breakdown may cause injury, smoke or ignition.
[4] 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.
[5] Carefully select external components (such as inputs and negative feedback capacitors) and load components (such
as speakers), for example, power amp and regulator.
If there is a large amount of leakage current such as input or negative feedback condenser, the IC output DC voltage
will increase. If this output voltage is connected to a speaker with low input withstand voltage, overcurrent or IC failure
can cause smoke or ignition. (The over current can cause smoke or ignition from the IC itself.) In particular, please pay
attention when using a Bridge Tied Load (BTL) connection type IC that inputs output DC voltage to a speaker directly.