TS4990 datasheet(19/33 Pages) STMICROELECTRONICS

部件名	TS4990

功能描述	1.2 W audio power amplifier with active-low standby mode

PDF	33 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

标志

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)



TS4990 数据表(PDF) 19 Page - STMicroelectronics

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