Application information

TS4974

18/25

and the maximum value is obtained when:

and its value is:

Equation 3

Note:

This maximum value is only dependent on the power supply voltage and load

values.

The efficiency is the ratio between the output power and the power supply:

Equation 4

The maximum die temperature allowable for the TS4974 is 125°C. However, in case of

overheating, a thermal shutdown set to 150° C, puts the TS4974 in standby until the

temperature of the die is reduced by about 5° C.

●

●

●

Using the power dissipation formula given above in Equation 3 this gives a result of:

Equation 5

∂Pdiss

∂P

out

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

)

W

(

R

Vcc

2

max

Pdiss

L

2

2

π

=

η=

P

out

P

supply

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

πV

peak

4V

CC

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

η= π

4

----- = 78.5%

T

amb

125

° CR

TJHA

P

dissmax

×

–

=