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R5975D 데이터시트(PDF) 35 Page - STMicroelectronics

부품명 R5975D
상세설명  Up to 3 A step-down switching regulator for aerospace applications
PDF  47 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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R5975D 데이터시트(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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