TS4984FC

Application Information

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and the maximum value is obtained when:

and its value is:

Note:

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

The efficiency,

η, is the ratio between the output power and the power supply:

The maximum theoretical value is reached when

The TS4984 has two independent power amplifiers, and each amplifier produces heat due to its

power dissipation. Therefore, the maximum die temperature is the sum of the each amplifier’s

maximum power dissipation. It is calculated as follows:

or, stated differently:

4.5

Decoupling the circuit

Two capacitors are needed to correctly bypass the TS4984. A power supply bypass capacitor

similar THD+N performances to those shown in the datasheet. For example:

●

on the power supply rail are less filtered.

●

are more filtered.

of PSRR (with input grounded and in the lower frequency region), in the following manner:

●

∂P

diss

∂P

ou t

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

P

dissmax

2V

cc

2

L

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

=

W

()

η =

P

ou t

P

su pp ly

------------------- =

πV

PEAK

4V

CC

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

π

4

----- = 78.5%

Total P

diss

P

d iss1

P

diss2

(W)

=

=

Total P

diss

42V

CC

π R

L

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

out

2P

out

–

=

W

()