Rainbow-electronics BA4900 Manual do Utilizador descarregar pdf (Página 7)

257

Regulator ICs BA4900

FEstimate of allowable power dissipation.

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

See Fig.3 for thermal derating characteristics, including some cases where heat sinks are used.

A = maximum output voltage for V

I1 = maximum output current for VDD

I2 = maximum output current for COM

3 = maximum output current for AMP

4 = maximum output current for ANT

5 = maximum output current for RADIO

6 = maximum output current for FM

7 = maximum output current for VAR

S Power consumed by V

DD 5.8V P1 = (A  5.8V)  I1  (I1 / 20  I1 / 10)  A

S Power consumed by COM 8.0V P

2 = (A  8.0V)  I2  (I2 / 30  I2 / 10)  A

S Power consumed by AMP P

3 = 1V  I3  (22mA)  A

S Power consumed by ANT P

4 = 1V  I4  (22mA)  A

S Power consumed by RADIO 8.0V P

5 = (A  8.0V)  I5  (I5 / 60  I5 / 10)  A

S Power consumed by FM 8.0V P

6 = (A  8.0V)  I6  (I6 / 60  I6 / 10)  A

S Power consumed by VAR 10.0V P

8 = (A  10.0V)  I7  (I7 / 10  I7 / 10)  A

S Power consumed internally by each circuit P

7 = VCC  supply current (about 13mA)

PMax. = P

1  P2  P3  P4  P5  P6  P7 P8

Fig.1

1 2 3 4 5 6 7 8 9 10

Sem comentários

Rainbow-electronics BA4900 Manual do Utilizador Página 7