BA3918 查看數據表（PDF） - ROHM Semiconductor

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BA3918

System power supply for car stereo

ROHM Semiconductor 

Regulator ICs

FEstimate of allowable power dissipation

Except under transitional conditions, the power dissipation of this IC is 3W per unit at 25_C.

See Fig. 4 for thermal derating characteristics, including some cases where heat sinks are used.

BA3918

A = maximum voltage for VCC

I1 = maximum output current for VDD

I2 = maximum output current for COM

I3 = maximum output current for AMP

I4 = maximum output current for ANT

I5 = maximum output current for AM

I6 = maximum output current for FM

S Power consumed by VDD 5.6V

S Power consumed by COM 8.7V

S Power consumed by AMP

S Power consumed by ANT

S Power consumed by AM 8.7V

S Power consumed by FM 8.7V

S Power consumed internally by each circuit

P1 = (A * 5.6V) I1 ) (I1 / 20 ) I1 / 10) A

P2 = (A * 8.7V) I2 ) (I2 / 30 ) I2 / 10) A

P3 = 1V I3 ) (22mA) A

P4 = 1V I4 ) (22mA) A

P5 = (A * 8.7V) I5 ) (I5 / 30 ) I5 / 10) A

P6 = (A * 8.7V) I6 ) (I2 / 50 ) I6 / 10) A

P7 = VCC circuit current (about 5mA)

PMax. = P1 ) P2 ) P3 ) P4 ) (P5 or P6, whichever is greater) ) P7

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