TS4956 datasheet(40/51 Pages) STMICROELECTRONICS

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TS4956

Application information

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and the maximum value is obtained when:

and its value is:

Note:

This maximum value depends only 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

The TS4956 has one active output BTL power amplifier when in modes 1 and 2. In mode 7,

the TS49656 has two active output BTL power amplifiers.

Each amplifier produces heat due to its power dissipation. Therefore the maximum die

temperature is the sum of each amplifier’s maximum power dissipation. It is calculated as

follows:

●

Pdiss 1 = power dissipation due to the first BTL power amplifier.

●

Pdiss 2 = power dissipation due to the second BTL power amplifier.

●

Total Pdiss =Pdiss 1 +Pdiss 2 (W)

In most cases,

Pdiss 1 = Pdiss 2, giving:

out

∂

∂P

diss

MA X

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

()

out

sup ply

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

πV

PEAK

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

---

78.5%

TotalP

diss

diss1

To talP

diss

42VCC

π R

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

out

ou t

(W)

–

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