BA3911 데이터 시트보기 (PDF) - ROHM Semiconductor

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BA3911

Reference voltage power supply

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.

BA3911

Fig.1

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 = 0.5V I3 ) (I3 / 100 ) I3 / 10) A

P4 = 0.5V I4 ) (I4 / 100 ) I4 / 10) A

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

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

P7 = VCC supply current (about 5mA)

PMAX. = P1 ) P2 ) P3 ) P4 ) (P5 or P6, whichever is larger) ) P7

221

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