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R5975D датащи(PDF) 37 Page - STMicroelectronics

номер детали R5975D
подробное описание детали  Up to 3 A step-down switching regulator for aerospace applications
PDF  47 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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R5975D датащи(HTML) 37 Page - STMicroelectronics

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R5975D
Application information
47
8.7
Negative buck-boost regulator
In Figure 23, the circuit schematic for a standard buck-boost topology is shown. The output
voltage is:
Equation 42
where the ideal duty cycle D for the buck-boost converter is:
Equation 43
The considerations given in Section 8.7 for the real duty cycle are still valid here. Also
Equation 39 to 41 can be used to calculate the maximum output current. So, for example,
considering the conversion VIN = 12 V to VOUT = -5 V, ILOAD = 0.5 A:
Equation 44
Equation 45
An important point to take into account is that the ground pin of the device is connected to
the negative output voltage. Therefore, the device is subjected to a voltage equal to
VIN - VO, which must be lower than 36 V (the maximum operating input voltage).
Figure 23. Negative buck-boost regulator
VOUT
VIN
–
D
1D
–
-------------
=
D
V
– OUT
VIN VOUT
–
------------------------------
=
D
5
512
+
----------------
0.706
==
ISW
ILOAD
1D
–
---------------
0.5
10.706
–
------------------------
1.7A
==
=



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