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參數(shù)資料
| 型號： | BA17805TFP |
| 廠商： | Rohm CO.,LTD. |
| 英文描述： | Standard 78 series, 3-pin regulator |
| 中文描述： | 標(biāo)準(zhǔn)78系列，3針調(diào)節(jié)器 |
| 文件頁數(shù)： | 10/11頁 |
| 文件大小： | 122K |
| 代理商： | BA17805TFP |
BA178
!!
T / FP series
Regulator ICs
0
25
50
75
100
125
150
2.5
5
7.5
10
12.5
0
AMBIENT TEMPERATURE : Ta (
C)
P
(1) 10.0
(2) 1.0
Fig.10 Ta - power dissipation
Fig.3
characteristics (TO252-3)
(1) Infinite heat sink,
θ
j-c = 12.5 (
C/W)
(2) No heat sink
θ
j-c = 125.0 (
C/W)
"
Operation notes
(1) Although the circuit examples included in this handbook are highly recommendable for general use, you should be
thoroughly familiar with circuit characteristics as they relate to your own use conditions. If you intend to change the
number of external circuits, leave an ample margin, taking into account discrepancies in both static and dynamic
characteristics of external parts and Rohm ICs. In addition, please be advised that Rohm cannot provide complete
assurance regarding patent rights.
(2) Operating power supply voltage
When operating within the normal voltage range and within the ambient operating temperature range, most circuit
functions are guaranteed. The rated values can not be guaranteed for the electrical characteristics, but there are no
sudden changes of the characteristics within these ranges.
(3) Power dissipation
Heat attenuation characteristics are noted on a separate page and can be used as a guide in judging power
dissipation.
If these ICs are used in such in a way that the allowable power dissipation level is exceeded, an increase in the chip
temperature could cause a reduction in the current capability or could otherwise adversely affect the performance of
the IC. Make sure a sufficient margin is allowed so that the allowable power dissipation value is not exceeded.
(4) Preventing oscillation in output and using bypass capacitors
Always use a capacitor between the output pins and the GND to prevent fluctuation in the output and to prevent
oscillation between the output pins and the GND of the application’s input (V
IN
0.1
μ
F should be used.)
Changes in the temperature and other factors can cause the value of the capacitor to change, and this can cause
oscillation. To prevent this, we recommend using a tantalum capacitor which has minimal changes in nominal
capacitance.
Also, we recommend adding a bypass capacitor of about 0.33
μ
F between the input pin and the GND, as close to the
pin as possible.
(5) Thermal overload circuit
A built-in thermal overload circuit prevents damage from overheating. When the thermal circuit is activated, the various
outputs are in the OFF state. When the temperature drops back to a constant level, the circuit is restored.
(6) Internal circuits could be damaged if there are modes in which the electric potential of the application’s input (V
IN
) and
GND are the opposite of the electric potential of the various outputs. Use of a diode or other such bypass path is
recommended.
(7) Although the manufacture of this product includes rigorous quality assurance procedures, it may be be damaged if
absolute maximum ratings for voltage or operating temperature are exceeded. When damage has occurred, special
modes (such as short circuit mode or open circuit mode) cannot be specified. If it is possible that such special modes
may be needed, please consider using a fuse or some other mechanical safety measure.
(8) When used within a strong magnetic field, be aware that there is a slight possibility of malfunction.
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