bd67929efv ROHM Co. Ltd., bd67929efv Datasheet - Page 13

• Manufacturer Part Number: bd67929efv
• Description: Three-phase Brushless Motor Driver For Polygonal Mirrors [for Lbp, Ppc]
• Manufacturer: ROHM Co. Ltd.

BD67929EFV
© 2010 ROHM Co., Ltd. All rights reserved.
www.rohm.com
(12) Input terminal of IC
This IC is a monolithic IC, and between each element there is a P+ isolation foe element partition and a P substrate.
This P layer and each element's N layer make up the P-N junction, and various parasitic elements are made up.
For example, when the resistance and transistor are connected to the terminal as shown in figure,
Because of the IC's structure, the creation of parasitic elements is inevitable from the electrical potential relationship. The
operation of parasitic elements causes interference in circuit operation, and can lead to malfunction and destruction.
Therefore, be careful not to use it in a way which causes the parasitic elements to operate, such as by
applying voltage that is lower than the GND (P substrate) to the input terminal.
Parasitic element
Pin A
○When GND＞(Terminal A) at the resistance and GND＞(Terminal B) at the transistor (NPN),
○Also, when GND＞(Terminal B) at the transistor (NPN)
N
the P-N junction operates as a parasitic diode.
The parasitic NPN transistor operates with the N layers of other elements close to the aforementioned parasitic
diode.
P
+
N
GND
P
P substrate
P
+
Resistor
N
Pin A
Pattern Diagram of Parasitic Element
Parasitic
element
13/14
Parasitic element
Pin B
N
P
+
C
B
N
E
GND
P
P substrate
Transistor (NPN)
P
+
N
GND
Other adjacent elements
Pin B
B
Technical Note
2010.12 - Rev.A
C
E
GND
Parasitic
element