STA550 datasheet(13/16 Pages) STMICROELECTRONICS

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STA550

EXTERNAL COMPONENTS

Note: Vcontrol is the voltage at Att_Rel pin.

Name

Function

Value

Formula

R1 = R2

Input resistor

10K

Ω

(|G| = 5, Rr = 50K

Ω)

R3 = R4

Feedback resistor

50K

Ω

(|G| = 5, Ri = 10K

Ω

Cac

C1 = C2

AC Decoupling capacitor

100nF

(fp = 16Hz,

Rac =100K

Ω )

Cct

C3 = C4

Capacitor for the attack time

2.2

µF

(Tattack = 13mSec,

Vcontrol = 9V,

Ict = 1.5mA)

R5 = R6

Release constant time Resistor

470K

Ω

(t = 1 Sec. ,

Cct = 2.2

µF )

R7 = R8

Resistor for tracking input voltage

filter

10K

Ω

R9 = R10

Resistor for tracking input voltage

filter

56K

Ω

R11 = R12

Resistor for tracking input voltage

filter

10K

Ω

C5 = C6

Capacitor for Tracking input

voltage filter

1nF

C7 = C8

Dc decoupling capacitor

µF

R13

Bias Resistor for Stby/Mute

function

10K

Ω

R14

Stby/Mute constant time resistor

30K

Ω

R15

Mute resistor

30K

Ω

Capacitor for Stby/Mute resistor

2.2

µF

R16 = R17

Sensing resistor for SOA detector

120m

Ω

5% 4W

R18

Conversion resistor for threshold

voltage

100K

Ω

C10 = C11

Power supply filter capacitor

100nF

R22 = R24

Centering resistor

400

Ω , 1W

C12 = C13

Tracking rail power supply filter

680nF

R19

Protection

Ω

R20

TRK_out

40K

Ω

C14 = C15

Power supply filter capacitor

470

µF , 63V

C16 = C17

Feedback capacitor

100pF

Schottky diode

SB360

-------

⋅

Cac

π fp Rac

⋅⋅

---------------------------------

Cct

attack

Ict

Vcontrol

-------------------------

Rct

Cct

---------

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