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ST1S14 bảng dữ liệu(PDF) 26 Page - STMicroelectronics

tên linh kiện ST1S14
Giải thích chi tiết về linh kiện  Power good open collector output
PDF  46 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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ST1S14 bảng dữ liệu(HTML) 26 Page - STMicroelectronics

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Application information
ST1S14
26/46
DocID17977 Rev 2
7.3
Thermal considerations
The dissipated power of the device is tied to three different sources:
•
Conduction losses due to the not insignificant RDSON, which are equal to:
Equation 24
where D is the duty cycle of the application. Note that the duty cycle is theoretically given by
the ratio between VOUT and VIN, but in practice it is substantially higher than this value to
compensate for the losses in the overall application. For this reason, the conduction losses
related to the RDSON increase compared to an ideal case.
•
Switching losses due to turning on and off. These are derived using the following
equation:
Equation 25
where TRISE and TFALL represent the switching times of the power element that cause the
switching losses when driving an inductive load (see Figure 15). TSW is the equivalent
switching time.
Figure 15. Switching losses
•
Quiescent current losses.
Equation 26
P
ON
R
DSON
I
OUT
()
⋅
2
D
⋅
=
P
SW
V
IN
I
OUT
T
RISE
T
FALL
+
()
2
-----------------------------------------
F
SW
V
IN
=
I
OUT
T
SW_EQ
F
SW
⋅⋅
⋅
⋅
⋅
⋅
=
P
Q
V
IN
I
Q
⋅
=



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