TS4998 datasheet(23/33 Pages) STMICROELECTRONICS

Part #	TS4998

Description	2 x 1W differential input stereo audio amplifier

PDF	33 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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23 / 33 page

TS4998

Application information

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4.6

Power dissipation and efficiency

Assumptions:

●

Load voltage and current are sinusoidal (Vout and Iout)

●

Supply voltage is a pure DC source (VCC)

The output voltage is:

and

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

Equation 3

The power delivered by the supply voltage is:

Equation 4

Psupply = VCC IccAVG (W)

Therefore, the power dissipated by each amplifier is:

Pdiss = Psupply - Pout (W)

and the maximum value is obtained when:

and its value is:

Equation 5

Note:

This maximum value is only dependent on the power supply voltage and load values.

out = Vpeak sinωt (V)

out =

out

------------- (A)

out =

peak

--------------------- (W)

ccAVG = 2

peak

πR

----------------- (A)

diss

22V

π R

---------------------- P

out Pout W

()

–

∂Pdiss

∂P

out

--------------------- = 0

)

(

Vcc

max

Pdiss

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