SA575D datasheet(6/16 Pages) ONSEMI

Part #	SA575D

Description	Low Voltage Compandor

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SA575

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6

Compressor

The typical compressor configuration is shown in

Figure 3. In this mode, the rectifier cell and variable gain

cell are in the feedback path. R6 and R7 provide the DC

feedback to the summing amplifier. The input is AC

coupled through C12 and output is AC coupled through C8.

In a system with inputs and outputs AC coupled, C8 and C12

could be eliminated and only R6, R7, C7, and C13 would be

required. If the external components R6, R7 and C7 are

eliminated, then the output of the summing amplifier will

motor-boat in absence of signals or at extremely low

signals. This is because there is no DC feedback path from

the output to input. In the presence of an AC signal this

phenomenon is not observed and the circuit will appear to

function properly.

The compressor gain expression and the attack and

release time constant is given by Equation 3 and

Equation 4, respectively.

(eq. 3)

4VIN(avg)

3.8 k

W x 100 mA

where VIN(avg) = 0.95VIN(RMS)

1/2

Compressor gain =

(eq. 4)

tR = tA = 10 kW x CRECT = 10 kW x C4

2.2

mF

4.7

mF

10

mF

10

mF

1

mF

VREF

S

DG

C7

8

12

14

COMP IN

COMP OUT

11

16

15

13

Figure 3. Typical Compressor Configuration

10k

W

10k

W

3.8k

W

30k

W

30k

W

C12

R6

R7

C8

C13

C9

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SA575D Datasheet(PDF) 6 Page - ON Semiconductor

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