BD9267KUT ROHM [Rohm], BD9267KUT Datasheet - Page 27

• Manufacturer Part Number: BD9267KUT
• Description: White LED Diver for Backlight of Medium/Large-sized LCDs
• Manufacturer: ROHM [Rohm]

BD9267KUT
● ● ● ● Precautions in use
Status of this document
The Japanese version of this document is formal specification. A customer may use this translation version only for a reference
to help reading the formal version.
If there are any differences in translation version of this document formal version takes priority
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© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
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1.) This product is produced with strict quality control, but might be destroyed if used beyond its absolute maximum ratings including
Parasitic elements are formed by the relation of potential inevitably in the structure of IC. Operation of parasitic elements can
cause mutual interference among circuits, malfunction as well as damage. Therefore such use as will cause operation of
parasitic elements like application of voltage on the input terminal lower than GND (P board) need to not be done.
the range of applied voltage or operation temperature. Failure status such as short-circuit mode or open mode can not be
estimated. If a special mode beyond the absolute maximum ratings is estimated, physical safety countermeasures like fuse
needs to be provided.
The circuit functionality is guaranteed within of ambient temperature operation range as long as it is within recommended
operating range. The standard electrical characteristic values cannot be guaranteed at other voltages in the operating ranges,
however the variation will be small.
When this product is installed on a printed circuit board, attention needs to be paid to the orientation and position of IC. Wrong
installation may cause damage to IC. Short circuit caused by problems like foreign particles entering between outputs or
between an output and power GND also may cause damage.
The pin connected a connector need to connect to the resistor for electrical surge destruction.
Use in a strong magnetic field may cause malfunction.
Thermal design needs to be done with adequate margin in consideration of allowable loss (Pd) in actual operation state.
This IC includes temperature protection circuit (TSD circuit). Temperature protection circuit (TSD circuit) strictly aims blockage of
IC from thermal runaway, not protection or assurance of IC. Therefore use assuming continuous use and operation after this
circuit is worked needs to not be done.
This IC is a monolithic IC which has P+ isolation for separation of elements and P board between elements.
A P-N junction is formed in this P layer and N layer of elements, composing various parasitic elements.
For example, a resistance and transistor are connected to a terminal as shown in the figure,
○
○
When GND>(Terminal A) in the resistance and when GND>(Terminal B) in the transistor (NPN), P-N junction operates
as a parasitic diode.
When GND>(Terminal B) in the transistor (NPN), parasitic NPN transistor operates in N layer of other elements nearby
the parasitic diode described before.
(Terminal A)
(Terminal A)
N
Parasitic element
P
＋
Resistance
GND
Figure 26.Example of simple structure of monolithic IC
P board
N
Parasitic element
P
GND
P
＋
N
(Terminal B)
27/28
(Terminal B)
Parasitic element
N
Transistor (NPN)
P
B
B
＋
C
C
E
GND
B
P board
N
N
P
GND
Parasitic element
E
TSZ02201-0F1F0C100050-1-2
P
＋
＋
N
GND
03.Aug.2012 Rev.001
Datasheet