TS4990IDT datasheet(19/33 Pages) STMICROELECTRONICS

Il numero della parte	TS4990IDT

Spiegazioni elettronici	1.2 W audio power amplifier with active-low standby mode

PDF	33 Pages

Scroll/Zoom	100%

Produttore elettronici	STMICROELECTRONICS [STMicroelectronics]

Homepage	http://www.st.com

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19 / 33 page

DocID9309 Rev 14

19/33

TS4990

Application information

The graph in Figure 60 shows an example of Cin and Cfeed influence.

Figure 60. Frequency response gain vs. Cin and Cfeed

4.4

Power dissipation and efficiency

Hypotheses:



Load voltage and current are sinusoidal (Vout and Iout).



Supply voltage is a pure DC source (VCC).

The load can be expressed as:

and

Therefore, the average current delivered by the supply voltage is:

The power delivered by the supply voltage is:

100

1000

10000

-25

-20

-15

-10

-5

Rin = Rfeed = 22k

Tamb = 25

°C

Cfeed = 2.2nF

Cfeed = 680pF

Cfeed = 330pF

Cin = 470nF

Cin = 82nF

Cin = 22nF

Frequency (Hz)

out = VPEAK sin t

(V)

out =

out

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

(A)

out =

PEAK

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

(W)

AVG

PEAK

R

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

(A)

supply

AVG

(W)



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