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L6981 Datasheet(PDF) 39 Page - STMicroelectronics

Part # L6981
Description  38 V, 1.5 A synchronous step-down converter with low quiescent current
PDF  49 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6981 Datasheet(HTML) 39 Page - STMicroelectronics

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Figure 45. Switching losses
It is also possible to estimate the junction temperature directly from the efficiency measurements acquired on a
stationary application condition.
Considering that the power losses are given by:
PLOSS=PIN−POUT
(49)
Neglecting the AC losses of the selected inductor, the power losses related to the L6981 are given by:
PLOSS L6981=VIN∙IIN−VOUT∙IOUT−DCRl∙IOUT2
(50)
Consequently, the junction temperature TJ can be calculated as:
TJ=TA+RtℎJA∙PLOSS, L6981
(51)
L6981
Thermal dissipation
DS13554 - Rev 1
page 39/49



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