TS4990 datasheet(19/32 Pages) STMICROELECTRONICS

部件名	TS4990

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

PDF	32 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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19 / 32 page

TS4990

Application information

19/32

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 ωt

(V)

out =

out

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

(A)

out =

PEAK

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

(W)

AVG

PEAK

πR

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

(A)

supply

AVG

(W)

⋅

TS4990 数据表(PDF) 19 Page - STMicroelectronics

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