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R5975D bảng dữ liệu(PDF) 35 Page - STMicroelectronics

tên linh kiện R5975D
Giải thích chi tiết về linh kiện  Up to 3 A step-down switching regulator for aerospace applications
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R5975D bảng dữ liệu(HTML) 35 Page - STMicroelectronics

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R5975D
Application information
47
Figure 21. Short-circuit current VIN = 36 V
8.6
Positive buck-boost regulator
The device can be used to implement a step-up/down converter with a positive output
voltage.
The output voltage is given by:
Equation 37
where the ideal duty cycle D for the buck-boost converter is:
Equation 38
However, due to power losses in the passive elements, the real duty cycle is always higher
than this. The real value (that can be measured in the application) should be used in the
following formulas.
The peak current flowing in the embedded switch is:
Equation 39
VOUT
VIN
D
1D
–
-------------
=
D
VOUT
VIN VOUT
+
------------------------------
=
ISW
ILOAD
1D
–
---------------
IRIPPLE
2
--------------------
+
ILOAD
1D
–
---------------
VIN
2L
-----------
D
fSW
---------
+
==



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