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BD3925HFP-C Fiches technique(PDF) 8 Page - Rohm

No de pièce BD3925HFP-C
Description  Voltage Tracker
Download  10 Pages
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Fabricant  ROHM [Rohm]
Site Internet  http://www.rohm.com
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BD3925HFP-C Fiches technique(HTML) 8 Page - Rohm

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Technical Note
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BD3925FP-C,BD3925HFP-C
www.rohm.com
2011.03 - Rev.B
© 2011 ROHM Co., Ltd. All rights reserved.
12. About positive surge voltage
To protect against a surge voltage that exceeds 50V between Vcc and GND please insert a power zener diode between
Vcc terminal and GND.
13. About negative surge voltage
To protect against a negative surge voltage, please insert a Schottky diode between the Vcc terminal and GND.
14. For an infinitesimal fluctuations of output voltage
At the use of the application that infinitesimal fluctuations of output voltage caused by some factors (e.g. disturbance
noise, input voltage fluctuations, load fluctuations, etc.), please take enough measures to avoid some influence (e.g.
insert the filter, etc.).
15. We recommend using Diode for protection purpose when the temperature so output voltage is off.
This is to prevent against large loads of impedance or reverse current during initial stages or output off stage
16. This monolithic IC contains P+ isolation and P substrate layers between adjacent elements in order to keep them isolated.
P/N junctions are formed at the intersection of these P layers with the N layers of other elements to create a variety of
parasitic elements. For example, when the resistors and transistors are connected to the pins as shown in the following
figure,
The P/N junction functions as a parasitic diode when GND > Pin A for the resistor or GND > Pin B for the transistor
(NPN).
Similarly, when GND > Pin B for the transistor (NPN), the parasitic diode described above combines with
the N layer of other adjacent elements to operate as a parasitic NPN transistor.
The formation of parasitic elements as a result of the relationships of the potentials of different pins is an inevitable result
of the IC's architecture. The operation of parasitic elements can cause interference with circuit operation as well as IC
malfunction and damage. For these reasons, it is necessary to use caution so that the IC is not used in a way that will
trigger the operation of parasitic elements, such as by the application of voltages lower than the GND (P substrate)
voltage to input pins. Keep in mind that the IC may malfunction in strong magnetic fields.,
Vcc
GND
D1
Vcc
GND
D1
Parasitic elements
(Pin A)
Parasitic elements
or Transistors
(Pin B)
GND
C
B
E
Resistor
Parasitic elements
(Pin A)
GND
N
P
N
P+
P+
P substrate
Parasitic elements or Transistors
P substrate
GND
N
P
N
N
P+
P+
(Pin B)
C
B
Transistor (NPN)
N
E
Example of Simple Monolithic IC Architecture


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