BD9207FPS 查看數據表（PDF） - ROHM Semiconductor

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BD9207FPS

LED Driver series for lighting Step-down type with 1.5A output

ROHM Semiconductor 

BD9207FPS

Technical Note

10. This IC is a monolithic IC, and there are P + isolation and P substrate for element separation between each

element. P-N joint is formed with this P layer and N each element’s layer, and various parasitic elements are

composed.

For instance, as shown in the figure below, when resistance and transistor are connected with terminal:

○ P-N joint operates as a parasitic diode when GND > (terminal A) in resistance, GND >(terminal B) in transistor

(NPN).

○ Moreover, when GND > (terminal B) in transistor (NPN),the parasitic NPN transistor operates with N layer of other

elements adjoining with above-mentioned parasitic diode.

According to potential relation, parasitic element in IC structure can be consequent. The operating of parasitic

element maybe interfere the circuit operation, and become the cause of malfunction and destruction. Therefore,

please pay enough attention not to use it by impressing lower voltage than GND (P substrate) on I/O terminal etc

to operate parasitic element.

（TerminalＡ）

Resistance

（TerminalＢ）

Transistor（ＮＰＮ）

Ｂ

Ｃ

Ｅ

Ｐ＋

Ｎ

Ｐsubstrate

Ｐ

Ｎ

Ｐ＋

Ｎ

Parasitic element

ＧＮＤ

Ｐ＋

Ｎ

Ｎ

Ｐ

Ｎ

ＧＮＤ

Ｐ＋

Ｎ

Parasitic element

Ｐsubstrate

ＧＮＤ

（TerminalＡ）

（TerminalＢ）

Parasitic element

Ｃ

Ｂ

Ｅ

ＧＮＤ

other adjoining elements

Simple structure example of bipolar IC

ＧＮＤ

Parasitic element

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10/11

2009.07 - Rev.A

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