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STA530

EXTERNAL COMPONENTS

Figure 7. BASH® module SAM261 6.1 with 2 x STA530 (see Application Note AN1643)

Power - On-Off sequences:

In order to avoid damages to the SAM261 board it is important to follow these sequences:

At Power-On apply in the first the Auxiliary Power Supply (±24V) and after the Main Power Supply

(+50V), in this condition the system is in "Mute state" and it can move in "play state" with the switch present

on the pcb.

At Power-Off is better to bring the SAM module in "Mute state" and after that to follow this order: switch-

off the Main Supply Voltage (+50V) and subsequently the Auxiliary Power Supply. (±24V).

Name

Function

Value

Formula

R1 = R2 =R7 = R8

Resistor for tracking input voltage

filter

10K

Ω

R5 = R6 =R3 = R4

Resistor for tracking input voltage

filter

56K

Ω

Cac

C1 = C2 = C3 = C4

AC Decoupling capacitor

100nF

(fp = 16Hz,

Rac =100K

Ω )

R9=R10=R11=R12 Resistor for tracking input voltage filter

10K

Ω

C5 = C6 = C7 = C8 Capacitor for Tracking input

voltage filter

1nF

C9=C10=C11=C12 Dc decoupling capacitor

1

µF

R17

Bias Resistor for Stby/Mute function

10K

Ω

R18

Stby/Mute constant time resistor

30K

Ω

R19

Mute resistor

30K

Ω

C19

Capacitor for Stby/Mute resistor

2.2

µF

C17 = C18

Power supply filter capacitor

100nF

R13 = R14

Centering resistor

330

Ω, 1W

C13 = C14

Tracking rail power supply filter

680nF

R15

TRK_out

40K

Ω

R16

Protection

1K

Ω

C15 = C16

Power supply filter capacitor

470

µF , 63V

D1

Schottky diode

SB360

Cac

1

2

π fp Rac

⋅⋅

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

=

STA530

4 x 50Watts

STA530

1 x 100Watts

2 x 50Watts

Buck

Regulator

+50VDC

8 Ohm Loads

4 Ohm Load

AudioInputs

STABP01

Controller

Dynamic Power Supply

(CD+ & CD-)

Signal Power Supply

+/-24V DC / 50

mA

+/-24V DC / 50

mA

Signal Power Supply

Lines

of

Controls

BASH fi module SAM261

6.1

STA530

4 x 50Watts

STA530

1 x 100Watts

2 x 50Watts

Buck

Regulator

+50VDC

8 Ohm Loads

4 Ohm Load

AudioInputs

STABP01

Controller

Dynamic Power Supply

(CD+ & CD-)

Signal Power Supply

+/-24V DC / 50

mA

+/-24V DC / 50

mA

Signal Power Supply

Lines

of

Controls

BASH fi module SAM261

6.1