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BA3960 数据表(PDF) 5 Page - Rohm |
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BA3960 数据表(HTML) 5 Page - Rohm |
5 / 5 page 140 Regulator ICs BA3960 FOperation notes (1) Operating power supply voltage When operating within proper ranges of power supply voltage and ambient temperature, most circuit functions are guaranteed. Although the rated values of electrical characteristics cannot be absolutely guaranteed, char- acteristic values do not change drastically within the proper ranges. (2) Power dissipation (Pd) Refer to the heat reduction characteristics (Fig. 5) and the rough estimation of IC power dissipation presented on a separate page. If power dissipation exceeds the al- lowable limit, the functionality of IC will be degraded (such as reduction of current capacity by increased chip temperature). Make sure to use the IC within the allow- able range of power dissipation with a sufficient margin. (3) Preventing oscillation at each output To stop oscillation of output, make sure to connect a ca- pacitor having a capacitance of 10 µF or greater between GND and each of the Active 1 and 2 output pins. Oscilla- tion can occur if capacitance is susceptible to tempera- ture. We recommend using a tantalum electrolytic capac- itor with minimal changes in capacitance. Also, output can be further stabilized by connecting a bypass capaci- tor between VCC and GND. (4) Overcurrent protection circuit An overcurrent protection circuit is installed on the Active 1 and 2 outputs, based on the respective current capac- ity. This prevents IC destruction when the load is short- circuited, by limiting the current with a curve shape of “7” in the voltage-current graph. The IC is designed with margins so that current flow will be restricted and latching will be prevented even if a large current suddenly flows through a large capacitor. Note that these protection cir- cuits are only good for preventing damage from sudden accidents. Make sure your design does not cause the protection circuit to operate continuously under transi- tional conditions (for instance, if output is clamped at 1VF or higher, short mode circuit operates at 1VF or lower). Note that the circuit ability is negatively correlated with temperature. (5) Thermal protection circuit A built-in thermal protection circuit prevents thermal damage to the IC. All outputs are switched OFF when the circuit operates, and revert to the original state when temperature drops to a certain level. (6) Grounding To minimize the variation of output voltage due to varia- tions in load current, the GND (pin 1, for large current) and the PRE GND (pin 3, for small current) pins are sepa- rately provided. Make sure to connect circuits to correct pins. (7) Output voltage setting ROHM recommends using a 3.9k Ω resistor for R12 and R22. Refer to a separate page for the output voltage set- ting. Note that making a large change to the R12 and R22 values will affect the current capacity. (8) MODE voltage Due to the IC’s internal structure, a reverse current flow will occur if the MODE voltage exceeds the VCC voltage. Make sure to avoid this. FExternal dimensions (Units: mm) |
类似零件编号 - BA3960 |
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类似说明 - BA3960 |
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