ST7540 datasheet(29/44 Pages) STMICROELECTRONICS

29 / 44 page

ST7540

Functional description

29/44

Note:

Notes: The rate of R2 takes in account the input resistance on the VSENSE pin (36KΩ). 10nF

capacitor effect has been neglected.

Figure 18. Typical output current vs RCL

●

Integrated Power Line Interface (PLI)

The Power Amplifier (PA) is a CMOS AB Class Power Amplifier. The PA requires, to

ensure a proper

operation, a regulated and well filtered Supply Voltage. Vcc Voltage and PA_OUT

Voltage must fulfil

the following formulas to work without clipping phenomena:

Table 11. VOUT Vs. R1 & R2 resistors value

Vout (Vrms)

Vout (dB

µV)

(R1+R2)/R2

R2 (K

Ω)

R1 (K

Ω)

0.150

103.5

1.1

7.5

1.0

0.250

108.0

1.9

5.1

3.9

0.350

110.9

2.7

3.6

5.6

0.500

114.0

3.7

3.3

8.2

0.625

115.9

4.7

3.3

11.0

0.750

117.5

5.8

2.7

12.0

0.875

118.8

6.6

2.0

11.0

1.000

120.0

7.6

1.6

10.0

1.250

121.9

9.5

1.6

13.0

1.500

123.5

10.8

1.6

15.0

Irms

(mA)

Rcl(k

Ω)

D01IN1311

120

220

320

420

520

620

720

820

920

1020

1120

1220

0.5 0.7 0.9 1.1 1.3 1.5 1.7 1.9 2.1 2.3 2.5 2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1

VPAOUT AC

()

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

VPOUT DC

() 3V

≥

VPOUT DC

()

VPAOUT AC

()

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

1.5V

≥

–

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