TS4994IST datasheet(24/31 Pages) STMICROELECTRONICS

Nome de Peças	TS4994IST

Descrição Electrónicos	1W Differential Input/Output Audio Power Amplifier with Selectable Standby

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Fabricante Electrônico	STMICROELECTRONICS [STMicroelectronics]

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24 / 31 page

TS4994

Application Information

24/31

4.6 Power dissipation and efficiency

Assumptions:

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

l Supply voltage is a pure DC source (Vcc)

Regarding the load we have:

and

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

The power delivered by the supply voltage is:

Psupply = Vcc IccAVG (W)

Then, the power dissipated by each amplifier is

Pdiss = Psupply - Pout (W)

and the maximum value is obtained when:

and its value is:

Note:

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

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

The maximum theoretical value is reached when Vpeak = Vcc, so

V

out = V PEAK sinω t (V)

I

out =

V

out

R L

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

P

out =

VPE AK

2

2RL

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

ICC

AVG

= 2

VPEAK

πRL

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

P

diss

22V

CC

π R

L

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

out Pou t

–

=

∂Pdiss

∂P

out

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

)

W

(

R

Vcc

2

max

Pdiss

L

2

π

=

η =

P

out

P

supply

--------------------- = π

VPEAK

4VCC

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

π

4

----- = 78.5%

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