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| Standard ICs Standard 78 series, 3-pin regulator BA178ffT / FP series The BA178ffT and BA178ffFP series are 3pin fixed positive output voltage regulators. These regulators are used to provide a stabilized output voltage from a fluctuating DC input voltage. There are 11 fixed output voltages, as follows : 5V, 6V, 7V, 8V, 9V, 10V, 12V, 15V, 18V, 20V, and 24V. The maximum current capacity is 1A for each of the above voltages. FApplications Constant voltage power supply FFeatures 1) Built-in overcurrent protection circuit and thermal shutdown circuit. 2) Excellent ripple regulation. 3) Available in TO220FP and TO252-3 packages, to meet wide range of applications. 4) Compatible with other manufacturers' regulators. 5) Richly diverse lineup (5V, 6V, 7V, 8V, 9V, 10V, 12V, 15V, 18V, 20V, 24V) FProduct codes 36 Standard ICs FInternal circuit configuration BA178ffT / FP series %Common specifications for BA178ffT / FP series& FAbsolute maximum ratings (Ta = 25_C) FRecommended operating conditions (Ta = 25_C) 37 Standard ICs BA178ffT / FP series FElectrical characteristics BA17805T / FP individual specifications (unless otherwise noted, Ta = 25_C, VIN =10V, Io = 500mA) 38 Standard ICs BA178ffT / FP series BA17806T / FP individual specifications (unless otherwise noted, Ta = 25_C, VIN =11V, Io = 500mA) BA17807T / FP individual specifications (unless otherwise noted, Ta = 25_C, VIN = 13V, Io = 500mA) 39 Standard ICs BA178ffT / FP series BA17808T / FP individual specifications (unless otherwise noted, Ta = 25_C, VIN = 14V, Io = 500mA) BA17809T / FP individual specifications (unless otherwise noted, Ta = 25_C, VIN = 15V, Io = 500mA) 40 Standard ICs BA178ffT / FP series BA17810T / FP individual specifications (unless otherwise noted, Ta = 25_C, VIN = 16V, Io = 500mA) BA17812T / FP individual specifications (unless otherwise noted, Ta = 25_C, VIN = 19V, Io = 500mA) 41 Standard ICs BA178ffT / FP series BA17815T / FP individual specifications (unless otherwise noted, Ta = 25_C, VIN = 23V, Io = 500mA) BA17818T / FP individual specifications (unless otherwise noted, Ta = 25_C, VIN = 27V, Io = 500mA) 42 Standard ICs BA178ffT / FP series BA17820T / FP individual specifications (unless otherwise noted, Ta = 25_C, VIN = 29V, Io = 500mA) BA17824T / FP individual specifications (unless otherwise noted, Ta = 25_C, VIN = 33V, Io = 500mA) 43 Standard ICs FMeasurement circuits BA178ffT / FP series 44 Standard ICs FElectrical characteristic curves BA178ffT / FP series 45 Standard ICs FOperation 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 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 BA178ffT / FP series oscillation between the output pins and the GN of the application's input (VIN 0.1F should be used.) Changes in the temperature and other factors can cause the valve 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 0.33F 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 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. 46 Standard ICs FExternal dimensions (Units: mm) BA178ffT / FP series 47 |
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