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A5974D bảng dữ liệu(PDF) 27 Page - STMicroelectronics

tên linh kiện A5974D
Giải thích chi tiết về linh kiện  Zero load current operation
PDF  46 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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A5974D bảng dữ liệu(HTML) 27 Page - STMicroelectronics

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A5974D
Application information
46
Figure 15 represents the estimation of power losses for different output voltages at
VIN = 5 V and TAMB = 60 C. The calculations are performed considering the RDS(on) of the
power element equal to 0.4 A.
Figure 15. Power losses estimation (VIN = 5 V, fSW = 250 kHz)
The red trace represents the maximum power which can be taken away as calculated
above, whilst the rest of the traces are the total internal losses for different output voltage.
The embedded conduction losses are proportional to the duty cycle required for the
conversion. Assuming the input voltage constant, the switching losses are proportional to
the output current while the quiescent losses can be considered as constant.
As a consequence, in Figure 15 the maximum power losses is for VOUT = 3.3 V, where the
system can manage a continuous output current up to 2.35 A. The device could deliver
a continuous output current up to 2.5 A to the load, however the maximum power loss of
2 W is reached with an output current of 2.35 A, so the maximum output power is derated.



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