tb62730wlg TOSHIBA Semiconductor CORPORATION, tb62730wlg Datasheet - Page 11

• Manufacturer Part Number: tb62730wlg
• Description: Step Up Type Dc-dc Converter For White Led
• Manufacturer: TOSHIBA Semiconductor CORPORATION

TOSHIBA
Notes on Contents
1. Block Diagrams
2. Equivalent Circuits
3. Application Circuits
4. Test Circuits
IC Usage Considerations
Some of the functional blocks, circuits, or constants in the block diagram may be omitted or simplified for explanatory purposes.
The equivalent circuit diagrams may be simplified or some parts of them may be omitted for explanatory purposes.
The application circuits shown in this document are provided for reference purposes only.
especially at the mass production design stage.
Toshiba does not grant any license to any industrial property rights by providing these examples of application circuits.
Components in the test circuits are used only to obtain and confirm the device characteristics. These components and circuits are not
guaranteed to prevent malfunction or failure from occurring in the application equipment.
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.
Tentative
13-Jun-07 (Rev0.1) TB62730WLG (Page. 11/11)
TB62730WLG
Thorough evaluation is required,