TS4994 datasheet(27/35 Pages) STMICROELECTRONICS

No. de pieza	TS4994

Descripción Electrónicos	1W differential input/output audio power amplifier with selectable standby

PDF	35 Pages

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Fabricante Electrónico	STMICROELECTRONICS [STMicroelectronics]

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27 / 35 page

TS4994

Application information

27/35

and

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

Equation 1

The power delivered by the supply voltage is:

Therefore, the power dissipated by each amplifier is:

Equation 2

and the maximum value is obtained when:

and its value is:

Equation 3

Note:

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

The efficiency is the ratio between the output power and the power supply:

Equation 4

The maximum theoretical value is reached when VPEAK = VCC, so:

The maximum die temperature allowable for the TS4994 is 125°C. However, in case of

overheating, a thermal shutdown set to 150°C, puts the TS4994 in standby until the

temperature of the die is reduced by about 5°C.

out =

peak

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

AVG = 2

peak

πR

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

supply

AVG

(W)

⋅

diss

supply

out

(W)

–

diss

22V

π R

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

out Pout

–

∂P

diss

∂P

out

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

)

(

Vcc

max

Pdiss

η=

out

supply

------------------- =

πV

peak

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

η= π

----- = 78.5%

TS4994 Datasheet(PDF) 27 Page - STMicroelectronics

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