ta78m05f TOSHIBA Semiconductor CORPORATION, ta78m05f Datasheet - Page 16

• Manufacturer Part Number: ta78m05f
• Description: Output Current Of 0.5 A, Three-terminal Positive Voltage Regulators
• Manufacturer: TOSHIBA Semiconductor CORPORATION

Precautions on Application
(1)
(2)
(3)
(4)
In regard to GND, be careful not to apply a negative voltage to the input/output terminal.
Further, special care is necessary in the case of a voltage boost application.
If a surge voltage exceeding the absolute maximum rating is applied to the input terminal or if a
voltage in excess of the input terminal voltage is applied to the output terminal, the circuit may be
destroyed.
Particular care is necessary in the case of the latter.
causing the output terminal voltage to exceed the input voltage (GND potential) and the electrical
charge of the chemical capacitor connected to the output terminal to flow into the input side.
as shown in the figure below.
When the input voltage is too high, the power dissipation of the three-terminal regulator, which is a
series regulator, increases, causing the junction temperature to rise. In such a case, it is
recommended to reduce the power dissipation, and hence the junction temperature, by inserting a
power-limiting resistor R
The power dissipation P
regulation and, in certain circumstances, parasitic oscillation.
Be sure to connect a capacitor near the input terminal and output terminal between both terminals
and GND. The capacitances should be determined experimentally because they depend on printed
circuit board patterns. In particular, adequate investigation should be made to ensure there is no
problem even in high or low temperatures.
Circuit destruction may also occur if the input terminal shorts to GND in a state of normal operation,
Where these risks exist, take steps such as connecting zener and general silicon diodes to the circuit,
Reducing V
To determine the resistance value of R SD , design with a margin, referring to the following equation.
IN'
V
IN
below the lowest voltage necessary for the IC will cause ripple, deterioration in output
R
SD
D
SD
of the IC is expressed in the following equation.
V
in the input terminal.
IN’
1
TA78MxxF
SERIES
16
TA78M05,06,08,09,10,12,15,18,20,24F
3
I
B
2
V
OUT
l
OUT
2007-02-19