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| Regulator ICs System power supply for CD playerequipped audio systems BA3963 With 5V and 7V outputs and a reset output that detects the 5V output, the BA3963 power supply IC is best suited for CD player-equipped audio systems. FApplications CD player-equipped audio systems FFeatures 1) A 5V output, a 7V output, and a reset output are built in. 2) All output circuits use a PNP transistor with a low saturation voltage. 3) Current limit circuit protects the IC against short-circuiting damage. 4) Thermal protection circuit prevents heat damage to the IC. 5) Compact SIP-M12 package allows a large power dissipation. FAbsolute maximum ratings (Ta = 25_C) FRecommended operating conditions (Ta = 25_C) 207 Regulator ICs FBlock diagram BA3963 FPin descriptions 208 Regulator ICs FInput / output circuits BA3963 209 Regulator ICs FElectrical characteristics (unless otherwise noted, Ta = 25_C and VCC = 12V) BA3963 210 Regulator ICs FCircuit operation OUT 5V rises when MODE 1 is 1.4V (Typ.), and OUT 7V rises when MODE 2 is 1.4V (Typ.). The reset output rises with a delay time (td) when OUT 5V is 4.2V (Typ.), and rises when OUT 5V is 4.1V (Typ.). BA3963 211 Regulator ICs BA3963 212 Regulator ICs FApplication example BA3963 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, characteristic values do not change drastically within the proper ranges. (2) Power dissipation (Pd) Refer to the heat reduction curves (Fig. 5) and the rough estimation of IC power dissipation given on a separate page. If power dissipation exceeds the allowable 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 allowable range of power dissipation with a sufficient margin. (3) Preventing oscillation at each output To stop oscillation of output, make sure to connect a capacitor having a capacitance of 10F or greater between GND and each output pin. Also, the 5V output ripple rejection is improved by connecting a capacitor having a capacitance of 1F or greater between pins 4 and 6. When connecting the capacitors, be sure to connect the polarities correctly. Oscillation of output can occur if capacitance is susceptible to temperature. We recommend using a tantalum electrolytic capacitor with minimal changes in capacitance. 213 Regulator ICs (4) Overcurrent protection circuit An overcurrent protection circuit is installed in each output system, based on the respective output current. This prevents IC destruction by overcurrent, 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 circuits are only good for preventing damage from sudden accidents. Make sure your design does not cause the protection circuit to operate continuously under transitional conditions (for instance, when 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. FThermal derating curve BA3963 (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 variations in load current, the GND (pin 12, for large current) and the PRE GND (pin 11, for small current) pins are separately provided. Make sure to connect circuits to correct pins. Estimate of allowable power dissipation (PMAX.) S Power consumed by OUT 5V S Power consumed by OUT 7V S Power consumed by the reset output S Power consumed internally by each circuit maximum output current of OUT 5V P1 = (VCC * 5V) P2 = (VCC * 7V) maximum output current of OUT 7V maximum output current of the reset output P3 = (VCC * 4.95V) supply current P4 = VCC PMAX. = P1 ) P2 ) P3 ) P4 214 Regulator ICs FExternal dimensions (Units: mm) BA3963 215 |
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