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BA3924 Scheda tecnica(PDF) 11 Page - Rohm |
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BA3924 Scheda tecnica(HTML) 11 Page - Rohm |
11 / 12 page 151 Regulator ICs BA3924 (3) Preventing oscillation at each output To stop output oscillation, make sure to connect a capaci- tor between GND and each of the MOTOR (pin 3), AU- DIO (pin 5), COMMON (pin 6), and CD (pin 8) output pins. Use capacitors whose valve are not below the val- ues denoted in the application circuit (Fig. 4) and not sus- ceptible to temperature. (4) Ground pins Pre GND (pin 10) and Pow GND (pin 12) are the ground pins of the IC. Pin 10 is the reference ground pin for pow- er supplies, including the built-in reference power supply, and the comparators. Voltage and threshold values may shift if the potential of pin 10 is unstable. Take sufficient care when designing the conductor pattern near this pin. The source current from this pin is in the level of a few mil- liamperes. Pin 12, which is connected to the ground traces other than those connected to pin 10, is connected with the IC substrate and the back metal. (5) External PNP transistors ROHM’s 2SB1370 (E- or F-rank) is recommended. This is a TO-220FP type transistor. (6) Overvoltage protection circuit Although the absolute maximum voltage is 22V, a peak voltage of 30V for 200ms is assured only during the standby state (pin 11 is LOW). The overvoltage circuit is activated when the VCC voltage exceeds 23V. When the circuit is activated, a standby circuit current (IST) of a few milliamperes flows in the IC. The overvoltage protection circuit is also activated if a voltage exceeding the absolute maximum rating is ap- plied while the STANDBY pin is HIGH. As a result all the output voltage is turned off. (7) Overcurrent protection circuit If the output current of any of the MOTOR (pin 3), AUDIO (pin 5), COMMON (pin 6), and CD (pin 8) exceeds the current capacity, the built-in current limit circuit limits the current to a set level. If the potential of each pin is about the same as that of Pow GND (pin 12), the output current is reduced to the level of the ground short-circuit current given in the “Electrical Characteristics.” (8) Thermal protection The circuit current, the limit current of each power supply output, and the ground short-circuit current decrease gradually with increasing temperature. For further protection, the thermal shutdown circuit turns off all out- puts when the IC is overheated, and brings back to nor- mal operation when the temperature is decreased to a certain level. |
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