TS4909 datasheet(26/35 Pages) STMICROELECTRONICS

No de pièce	TS4909

Description	Dual mode low power 150 mW stereo headphone amplifier with capacitor-less and single-ended outputs

PDF	35 Pages

Scroll/Zoom	100%

Fabricant	STMICROELECTRONICS [STMicroelectronics]

Site Internet	http://www.st.com

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26 / 35 page

Application information

TS4909

26/35

Doc ID 11972 Rev 9

and its value is:

Note:

This maximum value depends only on the 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 V

PEAK

= V

/2, so:

4.4.2

Phantom ground configuration

The average current delivered by the power supply voltage is:

Figure 81. Current delivered by power supply voltage in phantom ground

configuration

The power delivered by the power supply voltage is:

Therefore, the power dissipation by each amplifier is:

and the maximum value is obtained when:

and its value is:

Note:

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

diss

MA X

π2R

------------- W

()

OUT

supp ly

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

πV

P EAK

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

---

78.5 %

Ic c

AV G

---

P EAK

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

()

sin



P EAK

πR

--------------------- A

()

Icc (t)

Time

T/2

Vpeak/R

Icc

AVG

03T/2

supp ly

AVG

()

di ss

22 V

π R

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

OUT

()

–

OUT

∂

∂P

diss

di ss

MAX

π2R

--------------- W

()

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