BA3963 データシートの表示（PDF） - ROHM Semiconductor

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BA3963

System power supply for CD player-equipped audio system

ROHM Semiconductor 

Regulator ICs

(4) Overcurrent protection circuit

An overcurrent protection circuit is installed in each out-

put 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 capaci-

tor. 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 oper-

ate 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 cir-

cuit 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 varia-

tions in load current, the GND (pin 12, for large current)

and the PRE GND (pin 11, for small current) pins are sep-

arately 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

P1 = (VCC * 5V) maximum output current of OUT 5V

P2 = (VCC * 7V) maximum output current of OUT 7V

P3 = (VCC * 4.95V) maximum output current of the reset output

P4 = VCC supply current

PMAX. = P1 ) P2 ) P3 ) P4

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