TS488 datasheet(20/32 Pages) STMICROELECTRONICS

Part #	TS488

Description	Pop-free 120 mW stereo headphone amplifier

PDF	32 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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20 / 32 page

Application information

5.1

Power dissipation and efficiency

Hypotheses:

•

Voltage and current in the load are sinusoidal (Vout and Iout)

•

Supply voltage is a pure DC source (VCC)

Regarding the load, we have:

VOUT=VPEAKsinωt(V)

(1)

and

IOUT=VOUTRL(A)

(2)

and

POUT=V2PEAK2RL(A)

(3)

The average current delivered by the power supply voltage is:

ICCAVG= 12π∫0πVPEAKRLsin(t)dt=VPEAKπRL(A)

(4)

Figure 74. Current delivered by power supply voltage in single-ended configuration

Icc (t)

Time

T/2

Icc

AVG

Vpeak/R

3T/2

The power delivered by power supply voltage is:

Psupply=VCCICCAVG(W)

(5)

So, the power dissipation by each power amplifier is:

Pdiss=Psupply−POUT(W)

(6)

Pdiss= 2VCCπRL POUT−POUT(W)

(7)

and the maximum value is obtained when:

∂Pdiss

∂POUT=0

(8)

and its value is:

TS488

Application information

DS4579 - Rev 8

page 20/32

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