BA17818FP Просмотр технического описания (PDF) - ROHM Semiconductor

Номер в каталоге

Компоненты Описание

производитель

BA17818FP

Standard 78 series, 3-pin regulator

ROHM Semiconductor 

Regulator ICs

BA178!!T / FP series

12.5

(1) Infinite heat sink, θj-c = 12.5 (˚C/W)

(1) 10.0 (2) No heat sink θj-c = 125.0 (˚C/W)

10

7.5

5

2.5

(2) 1.0

0

0 25 50 75 100 125 150

AMBIENT TEMPERATURE : Ta (˚C)

Fig.10 Ta - power dissipation

Fig.3 characteristics (TO252-3)

"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 (VIN 0.1µF 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 0.33µF 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 (VIN) 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.

Share Link: