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L6983 数据表(PDF) 52 Page - STMicroelectronics

部件名 L6983
功能描述  38 V, 3 A synchronous step-down converter with 17 μA quiescent current
PDF  63 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

L6983 数据表(HTML) 52 Page - STMicroelectronics

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Figure 57. Switching losses
VSW(t)
ISW,HS (t)
VDS,HS(t)
t
t
VIN
TFALL
TRISE
PCOND,HS
PCOND,LS
PSW
It is also possible to estimate the junction temperature directly from the efficiency measures acquired on a
stationary application condition.
Considering that the power losses are given by:
PLOSS=PIN−POUT
(56)
Neglecting the AC losses of the selected inductor, the power losses related to the L6983 are given by:
PLOSS L6983=VIN∙IIN−VOUT∙IOUT−DCRl∙IOUT2
(57)
Therefore, the junction temperature TJ can be calculated as:
TJ=TA+RtℎJA∙PLOSS, L6983
(58)
L6983
Thermal dissipation
DS13116 - Rev 1
page 52/63



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