TS488 datasheet(23/32 Pages) STMICROELECTRONICS

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TS488-TS489

Application information

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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/2, so

4.2

Total power dissipation

The TS488/9 is stereo (dual channel) amplifier. It has two independent 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 R = Power dissipation due to the right channel power amplifier.

■ Pdiss L = Power dissipation due to the left channel power amplifier.

■ Total Pdiss =Pdiss R +Pdiss L (W)

Typically, Pdiss R is equal to Pdiss L, giving:

4.3

Lower cut-off frequency

The lower cut-off frequency FCL of the amplifier depends on input capacitors Cin and output

capacitors Cout.

The input capacitor Cin (output capacitor Cout) in serial with the input resistor Rin (load

resistor RL) of the amplifier is equivalent to a first order high pass filter. Assuming that FCL is

the lowest frequency to be amplified (with a 3dB attenuation), the minimum value of the Cin

(Cout) is:

diss

MAX

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

()

OUT

supply

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

πV

peak

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

---

78.5%

TotalP

diss

dissR

dissL

TotalP

diss

22VCC

π R

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

OUT

–

π F

⋅⋅

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

out

π F

⋅⋅

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

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