BD2202G-TR 查看數據表（PDF） - ROHM Semiconductor
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BD2202G-TR Datasheet PDF : 26 Pages
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BD2202G BD2206G
Datasheet
Operational Notes - continued
11. Unused Input Pins
Input pins of an IC are often connected to the gate of a MOS transistor. The gate has extremely high impedance
and extremely low capacitance. If left unconnected, the electric field from the outside can easily charge it. The
small charge acquired in this way is enough to produce a significant effect on the conduction through the
transistor and cause unexpected operation of the IC. So unless otherwise specified, unused input pins should be
connected to the power supply or ground line.
12. Regarding the Input Pin of the IC
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 the P layers with the N layers of other elements, creating
a parasitic diode or transistor. For example (refer to figure below):
When GND > Pin A and GND > Pin B, the P-N junction operates as a parasitic diode.
When GND > Pin B, the P-N junction operates as a parasitic transistor.
Parasitic diodes inevitably occur in the structure of the IC. The operation of parasitic diodes can result in mutual
interference among circuits, operational faults, or physical damage. Therefore, conditions that cause these diodes
to operate, such as applying a voltage lower than the GND voltage to an input pin (and thus to the P substrate)
should be avoided.
Resistor
Transistor (NPN)
Pin A
Pin A
Pin B
C
B
E
Pin B
N P+ N
Parasitic
Elements
P
N P+ N
P Substrate
GND
Parasitic
Elements
N P+
N P N P+ N
P Substrate
Parasitic
GND GND
Elements
Figure 41. Example of monolithic IC structure
B
N Region
close-by
C
E
Parasitic
Elements
GND
13. Ceramic Capacitor
When using a ceramic capacitor, determine the dielectric constant considering the change of capacitance with
temperature and the decrease in nominal capacitance due to DC bias and others.
14. Thermal Shutdown Circuit(TSD)
This IC has a built-in thermal shutdown circuit that prevents heat damage to the IC. Normal operation should
always be within the IC’s power dissipation rating. If however the rating is exceeded for a continued period, the
junction temperature (Tj) will rise which will activate the TSD circuit that will turn OFF all output pins. When the Tj
falls below the TSD threshold, the circuits are automatically restored to normal operation.
Note that the TSD circuit operates in a situation that exceeds the absolute maximum ratings and therefore, under
no circumstances, should the TSD circuit be used in a set design or for any purpose other than protecting the IC
from heat damage.
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